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71.080.30 - Organic nitrogen compounds

ICS 71.080.30 Details

Organic nitrogen compounds

Organische Stickstoffverbindungen

Composes organiques de l'azote

Organske dušikove spojine

General Information

Parent
71.080 - Organic chemicals

Frequently Asked Questions

ICS 71.080.30 is a classification code in the International Classification for Standards (ICS) system. It covers "Organic nitrogen compounds". The ICS is a hierarchical classification system used to organize international, regional, and national standards, facilitating the search and identification of standards across different fields.

There are 53 standards classified under ICS 71.080.30 (Organic nitrogen compounds). These standards are published by international and regional standardization bodies including ISO, IEC, CEN, CENELEC, and ETSI.

The International Classification for Standards (ICS) is a hierarchical classification system maintained by ISO to organize standards and related documents. It uses a three-level structure with field (2 digits), group (3 digits), and sub-group (2 digits) codes. The ICS helps users find standards by subject area and enables statistical analysis of standards development activities.

Standardization Organization
Technical Committee
Directive
Mandate
50
ASTM
ASTM D5315-04(2024)(Test Method)
Standard Test Method for Determination of N-Methyl-Carbamoyloximes and N-Methylcarbamates in Water by Direct Aqueous Injection HPLC with Post-Column Derivatization

SIGNIFICANCE AND USE
5.1 N-methylcarbamates and n-methylcarbomoyloximes are used in agriculture as insecticides and herbicides. They are sometimes found in both surface and ground waters and can be toxic to animals and plants at moderate to high concentrations. The manufacturing precursors and degradation products may be equally as hazardous to the environment.
SCOPE
1.1 This is a high-performance liquid chromatographic (HPLC) test method applicable to the determination of certain n-methylcarbamoyloximes and n-methylcarbamates in ground water and finished drinking water (1).2 This test method is applicable to any carbamate analyte that can be hydrolyzed to a primary amine. The following compounds have been validated using this test method:    
Analyte  
Chemical Abstract Services
Registry Number A  
Aldicarb  
116-06-3    
Aldicarb sulfone  
1646-88-4    
Aldicarb sulfoxide  
1646-87-3    
Baygon  
114-26-1    
Carbaryl  
63-25-2    
Carbofuran  
1563-66-2    
3-Hydroxycarbofuran  
16655-82-6    
Methiocarb  
2032-65-7    
Methomyl  
16752-77-5    
Oxamyl  
23135-22-0    
1.2 This test method has been validated in a collaborative round-robin study (2) and estimated detection limits (EDLs) have been determined for the analytes listed in 1.1 (Table 1). Observed detection limits may vary between ground waters, depending on the nature of interferences in the sample matrix and the specific instrumentation used.  
1.3 This test method is restricted to use by, or under the supervision of, analysts experienced in both the use of liquid chromatography and the interpretation of liquid chromatograms. Each analyst should demonstrate an ability to generate acceptable results with this test method using the procedure described in 12.3.  
1.4 When this test method is used to analyze unfamiliar samples for any or all of the analytes listed in 1.1, analyte identifications should be confirmed by at least one additional qualitative technique.  
1.5 The values stated in SI units are to be regarded as standard. No other units of measurement are included in this standard.  
1.6 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety, health, and environmental practices and determine the applicability of regulatory limitations prior to use. Additional guidance on laboratory safety is available and suitable references for the information are provided  (3-5).  
1.7 This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.

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ISO
ISO 8112:2023(Main)
Caprolactam for industrial use - Determination of colour of 50 % aqueous caprolactam solution, expressed in Hazen units (platinum-cobalt scale) - Spectrometric method

This document specifies a spectrometric method of determining the colour, expressed in Hazen units, of a 50 % aqueous caprolactam solution as a measure of coloured impurities content of the sample.

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ISO
ISO 7059:2023(Main)
Caprolactam for industrial use - Determination of absorbance at a wavelength of 290 nm

This document specifies a spectrometric method for the determination of the absorbance at a wavelength of 290 nm of caprolactam for industrial use.

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ASTM
ASTM E579-04(2023)(Test Method)
Standard Test Method for Limit of Detection of Fluorescence of Quinine Sulfate in Solution

SIGNIFICANCE AND USE
4.1 When determining the limiting detectable concentration of a fluorescent substance, it is usually necessary to increase the readout scale of a photoelectric instrument to a point where noise (that is, random fluctuations of the system) becomes apparent. This noise will be superimposed upon the signal from the sample.  
4.2 In molecular fluorescence spectroscopy, the limit of detection for the sample will be determined by the limiting signal-to-noise ratio, S/N, where the signal, S, is the difference between readings obtained with the sample and blank solutions, and N is the total root-mean-square (rms) noise. The limit of detection for the sample will be given by the instrument readings that give a signal equal to three times the rms value of the noise.
Note 2: Factors other than noise affecting the sample concentration corresponding to the limit of detection include: the spectral bandwidths of the excitation and emission monochromators, the intensity of the exciting light that can be concentrated on the sample, the fraction of the fluorescence collected by the detection system, the response time of the detection system, and the purity of the solvent. The size and arrangement of the sample container with respect to the light beams are also important, as they affect both the desired signal and the extraneous signal that only contributes noise.
Note 3: The value of rms noise (N) can be obtained by calculating the standard deviation of a series of readings of the signal from the sample at the peak emission wavelength at approximately 450 nm as follows:
   where:
     =  mean of the series of readings,   x  =  value of the individual reading, and   n  =  number of readings.   Alternatively, rms noise may be estimated by noting the extreme differences between the members of a series of readings (peak-to-peak noise) and dividing by a factor that is usually taken to be 5.6, 7
SCOPE
1.1 This test method employs the signal-to-noise ratio to determine the sensitivity of a fluorescence measuring system in testing for the limit of detection (LOD) of quinine sulfate dihydrate in solution. The results obtained with quinine sulfate dihydrate in solution are suitable for specifying instrument performance on samples having excitation and fluorescence bands wider than 10 nm at or near room temperature.  
1.1.1 This test method is not intended to be used as (1) a rigorous test of performance of instrumentation, or (2), to intercompare the quantitative performance of instruments of different design. Intercomparison of the LOD between instruments is commonly expressed as the ratio of the water Raman peak intensity to the root-mean-square (rms) noise as measured on a fluorometer using an excitation wavelength of 350 nm This test method uses the excitation and emission peak wavelengths for quinine sulfate dihydrate in solution, which are approximately 350 nm and 450 nm, respectively.  
1.2 This test method has been applied to fluorescence-measuring systems utilizing non-laser, low-energy excitation sources. There is no assurance that extremely intense illumination will not cause photodecomposition2 of the compound suggested in this test method. For this reason, it is recommended that this test method not be indiscriminately employed with high intensity light sources. This test method is not intended to determine minimum detectable amounts of other materials. If this test method is extended to employ other chemical substances, the user should be aware of the possibility that these other substances may undergo decomposition or adsorption onto containers.  
1.3 A typical LOD for conventional fluorometers using this test method is 1 ng of quinine sulfate per mL.  
1.4 The suggested shelf life of a 1 mg/mL stock solution of quinine sulfate dihydrate is three months, when stored in the dark in a stoppered glass bottle.  
1.5 The values stated in SI units are to be regarded as standard. No o...

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ASTM
ASTM D4471-22(Test Method)
Standard Test Method for Pyridine Bases in Cresylic Acid by Direct Titration

SIGNIFICANCE AND USE
5.1 The pyridine base content of cresylic acids is important in certain applications. This test method may be used as a tool for quality control and specification purposes by producers and users.
SCOPE
1.1 This test method covers the determination of pyridine and other basic nitrogen impurities in crude and refined cresylic acids streams, including mixtures.  
1.2 This test method is applicable for pyridine base levels of 0.001 % to 0.5 %.  
1.3 In determining the conformance of the test results using this method to applicable specifications, results shall be rounded off in accordance with the rounding-off method of Practice E29.  
1.4 The values stated in SI units are to be regarded as standard. No other units of measurement are included in this standard.  
1.5 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety, health, and environmental practices and determine the applicability of regulatory limitations prior to use. For specific hazard statements, see Section 8.  
1.6 This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.

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ASTM
ASTM D2074-07(2019)(Test Method)
Standard Test Methods for Total, Primary, Secondary, and Tertiary Amine Values of Fatty Amines by Alternative Indicator Method

ABSTRACT
These alternative test methods cover the indicator procedure for determining the total, primary, secondary, and tertiary amine values of fatty amines. These procedures are not applicable to fatty amidoamines and fatty diamines. The apparatus includes Erlenmeyer flasks and magnetic stirrer. Reagent grade chemicals shall be used in all tests and includes the following: water, bromphenol blue indicator solution, bromcresol green indicator solution, chloroform, hydrochloric acid standard solution, isopropyl alcohol, phenyl isothiocyanate, and salicylaldehyde. The procedure of determining the total amine values are detailed and the formula of calculating the total amine values is given.
SCOPE
1.1 These alternative test methods cover the indicator procedure for determining the total, primary, secondary, and tertiary amine values of fatty amines. These procedures are not applicable to fatty amidoamines and fatty diamines.  
1.2 The values stated in SI units are to be regarded as standard. No other units of measurement are included in this standard.  
1.3 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety, health, and environmental practices and determine the applicability of regulatory limitations prior to use.  
1.4 This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.

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ASTM
ASTM D4877-19(Test Method)
Standard Test Method for Polyurethane Raw Materials: Determination of APHA Color in Isocyanates

SIGNIFICANCE AND USE
5.1 This test method can be used for research or for quality control to characterize isocyanates used in polyurethane products.  
5.2 For toluene diisocyanate, results from this test method can relate to reactivity or performance in polyurethane systems.
SCOPE
1.1 This test method measures the color of clear liquids. It is applicable only to materials whose color-producing bodies have light-absorption characteristics similar to those of the platinum cobalt color standards used.2 (See Test Method D1209 and Note 1.) Suitable isocyanates include toluene diisocyanate, and pure or modified monomeric methylene di(phenylisocyanate).  
1.2 The values stated in SI units are to be regarded as standard.  
1.3 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety, health, and environmental practices and determine the applicability of regulatory limitations prior to use.
Note 1: This standard and ISO 6271-1 address the same subject matter, but differ in technical content.  
1.4 This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.

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ISO
ISO 8660:2002(Main)
Plastics - Determination of permanganate absorption number of caprolactam - Spectrometric method

This International Standard specifies a spectrometric method for the determination of the permanganate absorption number of caprolactam for industrial use. The permanganate absorption number is a measure of the oxidizable impurities in caprolactam, determined in a buffered neutral aqueous medium under fixed conditions. The method is applicable to purified caprolactam (and intermediates in the caprolactam purification process) with an alkalinity or acidity lower than 0,50 mmol/kg and a PAN value of up to 35.

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ASTM
ASTM E1788-16(Test Method)
Standard Test Method for Acidity in Acrylonitrile (Withdrawn 2022)

SIGNIFICANCE AND USE
4.1 This test method is useful for determining low levels of acidity, below 500 μg/g in acrylonitrile. The total acidity is calculated as acetic acid.  
4.2 Acidity may be present as a result of contamination or decomposition during storage, distribution, or manufacture.
SCOPE
1.1 This test method covers the determination of total acidity as acetic acid in concentrations below 500 μg/g in acrylonitrile.  
1.2 The values stated in SI units are to be regarded as standard. No other units of measurement are included in this standard.  
1.3 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use. Specific hazard statements are given in Section 8.  
1.4 Review the current Safety Data Sheets (SDS) for detailed information concerning toxicity, first aid procedures, and safety precautions.
WITHDRAWN RATIONALE
This test method covers the determination of total acidity as acetic acid in concentrations below 500 μg/g in acrylonitrile.
Formerly under the jurisdiction of Committee D20 on Plastics, this test method was withdrawn in July 2022. This standard is being withdrawn without replacement due to its limited use by industry.

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ASTM
ASTM E258-07(2015)(Test Method)
Standard Test Method for Total Nitrogen in Organic Materials by Modified Kjeldahl Method (Withdrawn 2019)

SIGNIFICANCE AND USE
4.1 This test method may be used to determine the total nitrogen content of certain unknown organic samples, or to assay known nitrogen containing organic compounds.  
4.2 This test method may be used on organic materials in which the complete conversion of nitrogen to ammonium sulfate can be accomplished by digestion in a mixture of sulfuric acid, potassium sulfate, and mercuric oxide. It cannot be used on materials containing N–O, N–N linkages.  
4.3 This test method assumes that ammonia can be quantitatively measured by distillation from an alkaline solution into a measured volume of standard acid.
SCOPE
1.1 This test method covers the determination of total nitrogen in nitrogen-containing organic compounds. This test method is not applicable for use on materials containing N-O, N-N linkages.
1.2 The values stated in SI units are to be regarded as standard. The values given in parentheses are for information only.  
1.3  This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use.
Note 1: Another method of restricted application is given in Test Method D1013.
WITHDRAWN RATIONALE
This test method covers the determination of total nitrogen in nitrogen-containing organic compounds. This test method is not applicable for use on materials containing N-O, N-N linkages.
Formerly under the jurisdiction of Committee D16 on Aromatic, Industrial, Specialty and Related Chemicals, this test method was withdrawn in November 2019. This standard is being withdrawn without replacement due to its limited use by industry and it is no longer in line with D16 guidelines.

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ASTM
ASTM E1784-08(Test Method)
Standard Test Method for Total Peroxides in Acrylonitrile (Withdrawn 2016)

SIGNIFICANCE AND USE
This test method provides for the determination of total peroxide in acrylonitrile in the range of 0.1 to 0.6 ppm. Only peroxides or other oxidants that react under the conditions of this test method are measured.
SCOPE
1.1 This test method describes a procedure for determining the total peroxide content of acrylonitrile in the range of 0.1 to 0.6 mg H2O2/kg acrylonitrile (ppm). Peroxides are an undesirable impurity in acrylonitrile.
1.2 The values stated in SI units are to be regarded as standard. No other units of measurement are included in this standard.
1.3 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use. Specific hazard statements are given in Section 7.  
1.4 Review the current Material Safety Data Sheets (MSDS) for detailed information concerning toxicity, first aid procedures, and safety precautions.
WITHDRAWN RATIONALE
This test method describes a procedure for determining the total peroxide content of acrylonitrile in the range of 0.1 to 0.6 mg H2O2/kg acrylonitrile (ppm). Peroxides are an undesirable impurity in acrylonitrile.
Formerly under the jurisdiction of Committee D16 on Aromatic Hydrocarbons and Related Materials, this test method was withdrawn in November 2016. This standard is being withdrawn without replacement due to its limited use by industry.

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ASTM
ASTM E1178-08(Test Method)
Standard Test Methods for Analysis of Acrylonitrile (Withdrawn 2016)

SIGNIFICANCE AND USE
These test methods provide for the determination of color and various impurities in acrylonitrile. Color and impurity levels are important factors in many uses of acrylonitrile.
SCOPE
1.1 These test methods cover the analysis of acrylonitrile.
1.2 The analytical procedures appear in the following order:
  Sections Color7 to 9 Hydrogen Cyanide10 to 18 p-Methoxyphenol19 to 28 Water29 to 32
1.3 The values stated in SI units are to be regarded as standard. No other units of measurement are included in this standard.
1.4 Review the current Material Safety Data Sheets (MSDS) for detailed information concerning toxicity, first aid procedures, and safety precautions.
1.5 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use. See Section 5 for specific hazards statements.  
10.1 This test method covers the determination of HCN over the concentration of 0.5 to 10 μg/g in acrylonitrile.  
19.1 This test method covers the determination of p-methoxyphenol (MEHQ) in acrylonitrile. MEHQ is added to acrylonitrile to prevent polymerization during storage and shipment.  
29.1 This test method covers the determination of water in the concentration of 0.05 to 3.0 mass (m/m) percent in product acrylonitrile.
WITHDRAWN RATIONALE
These test methods cover the analysis of acrylonitrile.
Formerly under the jurisdiction of Committee D16 on Aromatic Hydrocarbons and Related Chemicals, this test method was withdrawn in November 2016. This standard is being withdrawn without replacement due to its limited use by industry.

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ASTM
ASTM D301-95(2004)(Test Method)
Standard Test Methods for Soluble Cellulose Nitrate (Withdrawn 2011)

SIGNIFICANCE AND USE
Ash accounts for the nonsoluble, nonfilm forming portion of the polymer. It may affect solution clarity and film properties.
SCOPE
1.1 These test methods cover the material known as soluble cellulose nitrate (also known as soluble nitrocellulose), which is shipped wet in conformance with regulations of the Interstate Commerce Commission.
1.2 The test methods appear in the following sections: SectionsAshDrying SamplesNitrogenStabilityToluene DilutionViscosity
1.3 The values stated in SI units are to be regarded as the standard. Values given in parentheses are for information only.
1.4 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use. For specific hazard statements, see 12.2, 13.3, 16.1, and 16.2.
WITHDRAWN RATIONALE
These test methods cover the material known as soluble cellulose nitrate (also known as soluble nitrocellulose), which is shipped wet in conformance with regulations of the Interstate Commerce Commission.
Formerly under the jurisdiction of Committee D01 on Paint and Related Coatings, Materials, and Applications, this test method was withdrawn in June 2011. This standard is being withdrawn without replacement because of its limited use by industry.

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ASTM
ASTM D2075-92(1998)(Test Method)
Standard Test Method for Iodine Value of Fatty Amines, Amidoamines, and Diamines (Withdrawn 2007)

SCOPE
1.1 This test method (Note 1) covers the determination of the iodine value of fatty amines, diamines, and amidoamines by the Wijs procedure.  Note 1-This test method is essentially equivalent to Test Methods D2078 and D1959. Use of mercuric acetate permits reduced reaction time compared to Test Methods D2078 (30 min) and D1959 (1 h).
1.2 This standard does not purport to address all of the safety problems, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use.>
WITHDRAWN RATIONALE
This test method covers the determination of the iodine value of fatty amines, diamines, and amidoamines by the Wijs procedure. This test method is essentially equivalent to Test Methods D 2078 and D 1959. Use of mercuric acetate permits reduced reaction time compared to Test Methods D 2078 (30 min) and D 1959 (1 h).
Formerly under the jurisdiction of Committee D01 on Paint and Related Coatings, Materials, and Applications, this test method was withdrawn in March 2007 in accordance with section 10.5.3.1 of the Regulations Governing ASTM Technical Committees, which requires that standards shall be updated by the end of the eighth year since the last approval date.

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ASTM
ASTM D2082-92(1998)(Test Method)
Standard Test Method for Percent of Non-Amines in Fatty Nitrogen Compounds (Withdrawn 2007)

SCOPE
1.1 This method covers the determination of the percentage of non-amine components in fatty amines and diamines.
1.2 This standard does not purport to address all of the safety problems, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use.>
WITHDRAWN RATIONALE
This test method covers the determination of the percentage of non-amine components in fatty amines and diamines.
Formerly under the jurisdiction of Committee D01 on Paint and Related Coatings, Materials, and Applications, this test method was withdrawn in March 2007 in accordance with section 10.5.3.1 of the Regulations Governing ASTM Technical Committees, which requires that standards shall be updated by the end of the eighth year since the last approval date.

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ASTM
ASTM D2083-92(1998)(Test Method)
Standard Test Method for Calculation of Percent of Primary, Secondary, and Tertiary Amines in Fatty Amines (Withdrawn 2007)

SCOPE
1.1 This test method covers calculation of the percent of primary, secondary, and tertiary amines in the sample from determinations of primary, secondary, and tertiary amine values and percent of non-amine.  
1.2 This test method is applicable to materials containing only fatty primary amines, difatty secondary amines, trifatty tertiary amines, and nonamines. This method is not applicable to blends such as a mixture of coco primary amine and tallow difatty secondary amine.
1.3 This standard does not purport to address all of the safety problems, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use.>
WITHDRAWN RATIONALE
This test method covers calculation of the percent of primary, secondary, and tertiary amines in the sample from determinations of primary, secondary, and tertiary amine values and percent of non-amine.
Formerly under the jurisdiction of Committee D01 on Paint and Related Coatings, Materials, and Applications, this test method was withdrawn in March 2007 in accordance with section 10.5.3.1 of the Regulations Governing ASTM Technical Committees, which requires that standards shall be updated by the end of the eighth year since the last approval date.

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ASTM
ASTM D2073-92(1998)e1(Test Method)
Standard Test Methods for Total, Primary, Secondary, and Tertiary Amine Values of Fatty Amines, Amidoamines, and Diamines by Referee Potentiometric Method (Withdrawn 2007)

SCOPE
1.1 These referee test methods cover the potentiometric determination of the total, primary, secondary, and tertiary amine values of fatty amines and diamines, and the total amine value of fatty amidoamines. Test methods for primary, secondary, and tertiary amine values are not applicable to fatty amidoamines.  
1.2 This standard does not purport to address all of the safety problems, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use.> Specific hazard statements are given in Notes 1 and 2 and 6.1.
WITHDRAWN RATIONALE
These referee test methods cover the potentiometric determination of the total, primary, secondary, and tertiary amine values of fatty amines and diamines, and the total amine value of fatty amidoamines. Test methods for primary, secondary, and tertiary amine values are not applicable to fatty amidoamines.
Formerly under the jurisdiction of Committee D01 on Paint and Related Coatings, Materials, and Applications, this test method was withdrawn in March 2007 in accordance with section 10.5.3.1 of the Regulations Governing ASTM Technical Committees, which requires that standards shall be updated by the end of the eighth year since the last approval date.

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ASTM
ASTM D2030-97(Test Method)
Standard Test Method for Water Solubility of Refined Pyridine (Withdrawn 2003)

SCOPE
1.1 This test method covers the determination of the solubility of refined pyridine in water.  
1.2 This standard does not purport to address all of the safety problems, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use. For a specific hazard statement, see Section 6.

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ASTM
ASTM D2031-97(Test Method)
Standard Test Method for Reducing Substances in Refined Pyridine (Withdrawn 2003)

SCOPE
1.1 This test method covers the qualitative determination of reducing substances in refined pyridine.  
1.2 This standard does not purport to address all of the safety problems, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use. For specific hazard statements, see Section 6.

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ASTM
ASTM D2323-93(1997)e1(Specification)
Standard Specification for Refined Pyridine (1 Degree) (Withdrawn 2003)

SCOPE
1.1 This specification covers refined pyridine.
1.2 Consult current OSHA regulations and supplier's Material Safety Data Sheets for all materials used in this specification.
1.3 The following applies to all specified limits in this standard: for purposes of determining conformance with this standard, an observed value or a calculated value shall be rounded off "to the nearest unit" in the last right-hand digit used in expressing the specification limit, in accordance with the rounding-off method of Practice E29.

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ASTM
ASTM D4589-96(Test Method)
Standard Test Method for Nitrobenzene in Aniline (Withdrawn 2002)

SCOPE
1.1 This test method covers a polarographic procedure for the determination of nitrobenzene in aniline.
1.2 This test method has been found applicable to the determination of nitrobenzene in aniline containing concentrations of not more than 25 mg/kg nitrobenzene.
1.3 This standard does not purport to address all of the safety problems, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use. For specific hazard statements, see Section 9 and Note 3.

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ISO
ISO 8661:1988(Main)
Caprolactam for industrial use - Determination of volatile bases content - Titrimetric method after distillation

The volatile bases are distilled in alkaline medium under specified conditions and collected in a known volume of a standard volumetric hydrochloric acid solution in the presence of an indicator. The excess of the acid is titrated with a standard volumetric sodium hydroxide solution.

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ISO
ISO 8660:1988(Main)
Caprolactam for industrial use - Determination of permanganate index - Spectrometric method

Equal volumes of potassium permanganate solution are added to a carpolactam test solution and to a blank (water). After standing for a specified time the absorbance, at a wavelength of 420 nm, of the test solution and of the blank are compared in cells of 5 cm thickness. The permanganat index is the difference between the absorbance of the test sample and that of the blank, multiplied by 100/3. It is a conventional measure of the content of oxidizable impurities.

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ISO
ISO 8112:1984(Main)
Caprolactam for industrial use - Determination of colour of 50 % aqueous caprolactam solution, expressed in Hazen units (platinum-cobalt scale) - Spectrometric method

The absorbance of a 50 % aqueous caprolactam solution is spectrometrically measured at a wavelength of 390 nm and an optical path length of 50 mm. The result is expressed in Hazen units by multiplying the absorbance measured by a constant factor equal to 150. This factor is derived from measurements of absorbance of diluted standard solutions of platinum-cobalt scale.

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ISO
ISO 7060:1982(Main)
Caprolactam for industrial use - Determination of crystallizing point

A sample of liquid caprolactam, or a liquefied sample of crystalline caprolactam is cooled and the temperature at which crystallization occurs is observed.

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ISO
ISO 7059:1982(Main)
Caprolactam for industrial use - Determination of absorbance at a wavelength of 290 nm

The spectrometric measurement of the absorbance of a 50 % caprolactam water solution is carried out at a wavelength of 290 nm. The absorbance, expressed in relation to an optical path length of 1 m, is given by a specified formula in which AO is the correction for the difference in absorbances of the cells; A1 is the absorbance of the test solution, and 1 is the optical path length, in centimetres, of the cell.

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ISO
ISO 1594:1977(Main)
Urea for industrial use - Determination of ash

The procedure consists in the ignition of a test portion in a platinum dish at (800 25) °C to constant mass. - Replaces ISO Recommendation R 1594-1970.

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ISO
ISO 1592:1977(Main)
Urea for industrial use - Determination of nitrogen content - Titrimetric method after distillation

The procedure is based on the catalytic conversion of nitrogen present in a test portion to ammonia by heating in concentrated sulphuric acid solution. Distillation and absorption of the ammonia in an excess of standard volumetric sulphuric acid solution and back-titration with standard volumetric sodium hydroxide solution in the presence of an indicator. - Replaces ISO Recommendation R 1592-1970.

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ISO
ISO 1593:1977(Main)
Urea for industrial use - Determination of alkalinity - Titrimetric method

The principle consists in titration of the alkalinity of a test portion with a standard volumetric hydrochloric acid solution in the presence of an indicator. - Replaces ISO Recommendation R 1593-1970.

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ISO
ISO 4274:1977(Main)
Urea for industrial use - Determination of biuret content - Flame atomic absorption and photometric absorption methods

Applicable to products having contents of equal to or more than 0.05 % (m/m) (with flame atomic absorption) or 0.1 % (m/m) (with fotometric absorption). Covers the formation of a complex between biuret and copper(II) sulphate in alkaline medium. Fixation of this complex on an anion exchange resin. Elution of Cu first with a potassium nitrate solution and then with a nitric acid solution. Flame atomic absorption: aspiration of the solution into an acetylene-air flame and measurement of the absorption of the 325-nm line emitted by a copper hollow-cathode lamp; or by photometric absorption: formation of a coloured complex between Cu and zinc dibenzyldithiocarbamate, extraction with carbon tetrachloride and measurement at a wavelength of about 435 nm. Has also been approved by the IUPAC.

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ISO
ISO 2750:1974(Main)
Urea for industrial use - Measurement of colour in Hazen units (platinum-cobalt scale) of a urea-formaldehyde solution

Lays down the principle of the visual comparison of the colour of a solution of the sample in formaldehyde, stabilized at a pH of 10 0.1, with that of colour standards. Expression of the results in terms of Hazen units. For routine control purposes, referring to ISO 2211. The method has also been approved by the IUPAC.

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ISO
ISO 2752:1973(Main)
Urea for industrial use - Measurement of the variation of pH in the presence of formaldehyde - Potentiometric method

Specifies the principle of measurement, at (20 0.5) 0C, of the quantity of 0.01 N sodium hydroxide standard volumetric solution required to take the pH of a solution containing 50 g of sample in 100 ml of water to a pH of 8.3 after addition of formaldehyde. Has also been approved by the IUPAC.

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ISO
ISO 2754:1973(Main)
Urea for industrial use - Determination of biuret content - Photometric method

Applicable to the determination in the presence of ammoniacal salts less than 15 mg in the aliquot amount taken for the determination. In the presence of quantities exceeding 15 mg the ammoniacal nitrogen shall be removed by a cation exchange resin because these salts interfere with the determination. The principle of the reaction consists in formation of a violet-red complex between allophanic acid amide (H2 N.CO.NH.CO.NH2 ) and copper sulphate in the presence of an alkaline solution of potassium sodium tartrate. Photometric measurement at a wavelength of about 550 nm. Has also been approved by the IUPAC.

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ISO
ISO 2753:1973(Main)
Urea for industrial use - Determination of water content - Karl Fischer method

Specifies the manner in which this method is to be applied in a reaction of any water present in urea with a solution of iodine and sulphur dioxide in a mixture of pyridine and methanol (Karl Fischer reagent). This reagent is first standadized by titration with a precisely known mass of water. The end point of the reaction is read by the direct visual or direct electrometric method. The method has also been approved by the IUPAC.

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ISO
ISO 2751:1973(Main)
Urea for industrial use - Determination of the buffer coefficient - Potentiometric method

Applicable to solutions of conventional concentration. The principle consists in measurement, at (20 0.5) 0C, of the quantity of 0.05 N acid solution required to effect a pH change from 8 to 6 for a solution containing 100 g of urea in 1000 ml of solution. For the measurement a pH meter is used fitted with a glass electrode and a calomel electrode. The method has also been approved by the IUPAC.

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ISO
ISO 2749:1973(Main)
Urea for industrial use - Measurement of the pH of a solution of urea of conventional concentration (100 g/l) - Potentiometric method

Describes the measurement of a solution of a test sample by means of a pH meter fitted with one glass electrode and one calomel electrode. The pH meter has a sensitivity of 0.05 pH units. The calibration of the pH meter is carried out at (20 0.5) 0C by means of buffer solutions. The method has also been approved by the IUPAC.

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ISO
ISO/R 1595:1970(Main)
Urea for industrial use - Determination of iron content - 2,2'- Bipyridyl photometric method

Describes a method applicable to iron contents greater than or equal to 0.00005 % (m/m). The principle is based on the ignition of the material at 800 °C and fusion of the residue with anhydrous potassium hydrogen sulphate. Solution of the cooled melt in hydrochloric acid and reduction of iron(III) by means of hydroxylammonium chloride. Formation of an iron(II)-2,2'bipyridyl complex in the presence of a buffered solution (pH value between 4.5 and 6). Photometric measurement of the coloured complex at a wavelength of about 522 nm.

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