ASTM D7184-20
(Test Method)Standard Test Method for Ultra Low Nitrogen in Aromatic Hydrocarbons by Oxidative Combustion and Reduced Pressure Chemiluminescence Detection
Standard Test Method for Ultra Low Nitrogen in Aromatic Hydrocarbons by Oxidative Combustion and Reduced Pressure Chemiluminescence Detection
SIGNIFICANCE AND USE
5.1 This test method is useful to detect and quantify nitrogen-containing compounds at a concentration of 0.1 to 1.2 mg N/kg in light aromatic hydrocarbons used or produced in manufacturing process. These nitrogen-containing compounds are undesirable in finished aromatic products and may be used in setting specification for determining the total nitrogen content in aromatic hydrocarbons.
5.2 This test method requires the use of reduced pressure at the detector. Loss of vacuum or pressure fluctuations impact the sensitivity of the detector and the ability to determine nitrogen concentrations less than 1 mg N/kg.
SCOPE
1.1 This test method covers the determination of total nitrogen in aromatic hydrocarbons, such as benzene, toluene, and xylene.
1.2 This test method is applicable to samples with nitrogen concentrations up to 1.2 mg/kg. The Limit of Detection (LOD) is 0.04 mg/kg N and the Limit of Quantitation (LOQ) is 0.13 mg/kg N. For higher nitrogen concentrations refer to Test Method D4629. With careful analytical technique, this method can be used to successfully analyze concentrations below the current scope (see Appendix X1).
Note 1: LOD and LOQ were calculated using data in ASTM Research Report RR:D16-1044.
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 9.
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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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.
Designation: D7184 − 20
Standard Test Method for
Ultra Low Nitrogen in Aromatic Hydrocarbons by Oxidative
Combustion and Reduced Pressure Chemiluminescence
1
Detection
This standard is issued under the fixed designation D7184; the number immediately following the designation indicates the year of
original adoption or, in the case of revision, the year of last revision. A number in parentheses indicates the year of last reapproval. A
superscript epsilon (´) indicates an editorial change since the last revision or reapproval.
1. Scope* 2. Referenced Documents
2
2.1 ASTM Standards:
1.1 This test method covers the determination of total
D3437 Practice for Sampling and Handling Liquid Cyclic
nitrogen in aromatic hydrocarbons, such as benzene, toluene,
Products
and xylene.
D4629 Test Method for Trace Nitrogen in Liquid Hydrocar-
1.2 This test method is applicable to samples with nitrogen
bons by Syringe/Inlet Oxidative Combustion and Chemi-
concentrations up to 1.2 mg/kg. The Limit of Detection (LOD)
luminescence Detection
is 0.04 mg/kg N and the Limit of Quantitation (LOQ) is 0.13
D6809 Guide for Quality Control and Quality Assurance
mg/kg N. For higher nitrogen concentrations refer to Test
Procedures for Aromatic Hydrocarbons and Related Ma-
Method D4629. With careful analytical technique, this method
terials
can be used to successfully analyze concentrations below the
E29 Practice for Using Significant Digits in Test Data to
current scope (see Appendix X1).
Determine Conformance with Specifications
NOTE 1—LOD and LOQ were calculated using data inASTM Research
E691 Practice for Conducting an Interlaboratory Study to
Report RR:D16-1044.
Determine the Precision of a Test Method
1.3 In determining the conformance of the test results using 2.2 Other Documents:
this method to applicable specifications; results shall be OSHA Regulations, 29 CFR paragraphs 1910. 1000 and
3
rounded off in accordance with the rounding-off method of 1910.1200
Practice E29.
3. Terminology
1.4 The values stated in SI units are to be regarded as
3.1 Definitions:
standard. No other units of measurement are included in this
3.1.1 oxidative pyrolysis, n—a process in which a sample
standard.
undergoes combustion in an oxygen rich environment at
1.5 This standard does not purport to address all of the
temperatures greater than 900°C.
safety concerns, if any associated with its use. It is the
3.1.2 pyrolytic decomposition, n—combusting a compound
responsibility of the user of this standard to establish appro-
to decompose it to carbon dioxide, water and elemental oxides.
priate safety, health, and environmental practices and deter-
3.1.3 reduced pressure chemiluminescence, n—a chemical
mine the applicability of regulatory limitations prior to use.
reaction at pressure less than 760 mm mercury (Hg) in which
For specific hazard statements, see Section 9.
light is emitted.
1.6 This international standard was developed in accor-
dance with internationally recognized principles on standard-
4. Summary of Test Method
ization established in the Decision on Principles for the
Development of International Standards, Guides and Recom- 4.1 A specimen is introduced into a carrier gas stream, at a
mendations issued by the World Trade Organization Technical controlled rate, and incorporated into a high temperature
Barriers to Trade (TBT) Committee. furnace (900 to 1150°C) where an excess of oxygen is added.
2
For referenced ASTM standards, visit the ASTM website, www.astm.org, or
1
This test method is under the jurisdiction of ASTM Committee D16 on contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
Aromatic, Industrial, Specialty and Related Chemicals and is the direct responsi- Standards volume information, refer to the standard’s Document Summary page on
bility of Subcommittee D16.04 on Instrumental Analysis. the ASTM website.
3
Current edition approved June 1, 2020. Published June 2020. Originally AvailablefromU.S.GovernmentPrintingOfficeSuperintendentofDocuments,
approved in 2007. Last previous edition approved in 2019 as D7184 – 19. DOI: 732 N. Capitol St., NW, Mail Stop: SDE, Washington, DC 20401, http://
10.1520/D7184-20. www.access.gpo.gov.
*A Summary of Changes section appears at the end of this standard
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
1
---------------------- Page: 1 ----------------------
D7184 − 20
Pyrolysis converts hydrocarbons in the specimen to carbon 7.7 Boat Inlet System (Optional)—If the instrument is
dioxide and water. Organic nitrogen and inorganic nitrogen equipped with a boat inlet system, care must be taken to ensure
c
...
This document is not an ASTM standard and is intended only to provide the user of an ASTM standard an indication of what changes have been made to the previous version. Because
it may not be technically possible to adequately depict all changes accurately, ASTM recommends that users consult prior editions as appropriate. In all cases only the current version
of the standard as published by ASTM is to be considered the official document.
Designation: D7184 − 19 D7184 − 20
Standard Test Method for
Ultra Low Nitrogen in Aromatic Hydrocarbons by Oxidative
Combustion and Reduced Pressure Chemiluminescence
1
Detection
This standard is issued under the fixed designation D7184; the number immediately following the designation indicates the year of
original adoption or, in the case of revision, the year of last revision. A number in parentheses indicates the year of last reapproval. A
superscript epsilon (´) indicates an editorial change since the last revision or reapproval.
1. Scope*
1.1 This test method covers the determination of total nitrogen in aromatic hydrocarbons, such as benzene, toluene, and xylene.
1.2 This test method is applicable forto samples containingwith nitrogen from 0.1 to 1.2 mg N/kg. concentrations up to 1.2
mg/kg. The Limit of Detection (LOD) is 0.04 mg/kg N and the Limit of Quantitation (LOQ) is 0.13 mg/kg N. For higher nitrogen
concentrations refer to Test Method D4629. With careful analytical technique, this method can be used to successfully analyze
concentrations below the current scope (see Appendix X1).
NOTE 1—LOD and LOQ were calculated using data in ASTM Research Report RR:D16-1044.
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 9.
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.
2. Referenced Documents
2
2.1 ASTM Standards:
D3437 Practice for Sampling and Handling Liquid Cyclic Products
D4629 Test Method for Trace Nitrogen in Liquid Hydrocarbons by Syringe/Inlet Oxidative Combustion and Chemiluminescence
Detection
D6809 Guide for Quality Control and Quality Assurance Procedures for Aromatic Hydrocarbons and Related Materials
E29 Practice for Using Significant Digits in Test Data to Determine Conformance with Specifications
E691 Practice for Conducting an Interlaboratory Study to Determine the Precision of a Test Method
2.2 Other Documents:
3
OSHA Regulations, 29 CFR paragraphs 1910. 1000 and 1910.1200
3. Terminology
3.1 Definitions:
3.1.1 oxidative pyrolysis, n—a process in which a sample undergoes combustion in an oxygen rich environment at temperatures
greater than 900°C.
1
This test method is under the jurisdiction of ASTM Committee D16 on Aromatic, Industrial, Specialty and Related Chemicals and is the direct responsibility of
Subcommittee D16.04 on Instrumental Analysis.
Current edition approved Nov. 1, 2019June 1, 2020. Published November 2019June 2020. Originally approved in 2007. Last previous edition approved in 2019 as
ɛ1
D7184 – 15 (2019)D7184 – 19. . DOI: 10.1520/D7184-19.10.1520/D7184-20.
2
For referenced ASTM standards, visit the ASTM website, www.astm.org, or contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM Standards
volume information, refer to the standard’s Document Summary page on the ASTM website.
3
Available from U.S. Government Printing Office Superintendent of Documents, 732 N. Capitol St., NW, Mail Stop: SDE, Washington, DC 20401, http://
www.access.gpo.gov.
*A Summary of Changes section appears at the end of this standard
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
1
---------------------- Page: 1 ----------------------
D7184 − 20
3.1.2 pyrolytic decomposition, n—combusting a compound to decompose it to carbon dioxide, water and elemental oxides.
3.1.3 reduced pressure chemiluminescence, n—a chemical reaction at pressure less than 760 mm mercury (Hg) in which light
is emitted.
4. Summary of Test Method
4.1 A specimen is introduced into a carrier gas stream, at a controlled rate, and incorporated into a high temperature furnace
(900 to 1150°C) where an excess of oxygen is added. Pyrolysis
...
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