ASTM D3448-10
(Test Method)Standard Test Method for Specific Aqueous Conductance of Trichlorotrifluoroethane
Standard Test Method for Specific Aqueous Conductance of Trichlorotrifluoroethane
SIGNIFICANCE AND USE
This test method allows for the determination of ionizable contaminants (expressed in terms of ppb of HCl) in trichlorotrifluoroethane via measurement of specific aqueous conductance.
This test method can be used for establishing manufacturing and purchasing specifications.
SCOPE
1.1 This test method covers the determination of aqueous conductivity due to ionizable contaminants extracted from trichlorotrifluoroethane. The value of 1.9 μS/cm as maximum specific aqueous conductance corresponds to 0.1 ppm of chloride ion (100 ppb). It was calculated by putting the solvent specification of 0.1 ppm chloride into the equation of the subject method to find C2 − C1 equals 19.08. The specific conductance due to contaminants from the solvent was then calculated as follows:
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Designation:D3448 −10
StandardTest Method for
1
Specific Aqueous Conductance of Trichlorotrifluoroethane
This standard is issued under the fixed designation D3448; the number immediately following the designation indicates the year of
original adoption or, in the case of revision, the year of last revision.Anumber in parentheses indicates the year of last reapproval.A
superscript epsilon (´) indicates an editorial change since the last revision or reapproval.
1. Scope 4. Apparatus
2
1.1 This test method covers the determination of aqueous
4.1 Conductivity Bridge.
conductivity due to ionizable contaminants extracted from
3
4.2 Conductivity Cell, dip-type. Cell constant of 0.1 recip-
trichlorotrifluoroethane. The value of 1.9 µS/cm as maximum
rocal centimetre. Electrodes must be bright platinum.
specific aqueous conductance corresponds to 0.1 ppm of
chlorideion(100ppb).Itwascalculatedbyputtingthesolvent 4.3 Polyethylene Beaker, 250-mL.
specification of 0.1 ppm chloride into the equation of the
4.4 Polyethylene Bottles, wide mouth, 300-mLand 500-mL
subject method to find C − C equals 19.08. The specific
2 1
size.
conductance due to contaminants from the solvent was then
4.4.1 Calibrate and mark the outside of the 300-mL poly-
calculated as follows:
ethylene bottles to indicate 20, 120, and 220 mL(graduate) of
~C 2 C !C 5 ~19!~0.1! 51.9µS/cm (1)
water volume, using deionized water to determine the liquid
2 1 3
levels.
1.2 The above is exclusive of the background specific
conductance of the water used in the analysis.
4.5 Polyethylene Tubing, long enough to reach the bottom
of the 300-mL polyethylene bottle.
1.3 The values stated in SI units are to be regarded as
standard. No other units of measurement are included in this
5. Reagents
standard.
1.4 This standard does not purport to address all of the
5.1 Purity of Reagents—Reagent grade chemicals shall be
safety concerns, if any, associated with its use. It is the
used in all tests. Unless otherwise indicated, it is intended that
responsibility of the user of this standard to consult and
all reagents shall conform to the specifications of the Commit-
establish appropriate safety and health practices and deter-
tee onAnalytical Reagents of theAmerican Chemical Society,
4
mine the applicability of regulatory limitations prior to use.
where such specifications are available. Other grades may be
Specific precautionary statements are given in Section 6.
used, provided it is first ascertained that the reagent is of
sufficiently high purity to permit its use without lessening the
2. Summary of Test Method
accuracy of the determination.
2.1 Ionizable impurities in the solvent are extracted with
5.2 Alcoholic Hydrochloric Acid (0.01 N)—Dilute 5.0 mL
water of known low conductivity. The increase in water
(pipet)ofconcentratedhydrochloricacidto6Lwithdenatured
conductivity measures the amount of these impurities present.
2B ethyl alcohol.
3. Significance and Use
3.1 This test method allows for the determination of ioniz-
2
The sole source of supply of the apparatus (Serfass Model RCM-15B1) known
able contaminants (expressed in terms of ppb of HCl) in
to the committee at this time is Industrial Instrument Inc., Cedar Grove, NJ. If you
trichlorotrifluoroethane via measurement of specific aqueous are aware of alternative suppliers, please provide this information to ASTM
International Headquarters. Your comments will receive careful consideration at a
conductance.
1
meeting of the responsible technical committee, which you may attend.
3
3.2 This test method can be used for establishing manufac- The sole source of supply of the apparatus (Model Cel-A01) known to the
committee at this time is Industrial Instrument Inc., Cedar Grove, NJ. If you are
turing and purchasing specifications.
aware of alternative suppliers, please provide this information to ASTM Interna-
tional Headquarters.Your comments will receive careful consideration at a meeting
1
of the responsible technical committee, which you may attend.
1 4
This test method is under the jurisdiction of ASTM Committee D26 on Reagent Chemicals, American Chemical Society Specifications, American
Halogenated Organic Solvents and Fire Extinguishing Agents and is the direct Chemical Society, Washington, DC. For suggestions on the testing of reagents not
responsibility of Subcommittee D26.04 on Test Methods. listed by the American Chemical Society, see Analar Standards for Laboratory
Current edition approved June 1, 2010. Published August 2010. Originally Chemicals, BDH Ltd., Poole, Dorset, U.K., and the United States Pharmacopeia
approved in 1975. Last previous edition approved in 2005 as D3448–85(2005). and National Formulary, U.S. Pharmacopeial Convention, Inc. (USPC), Rockville,
DOI: 10.1520/D3448-10. MD.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshoho
...
This document is not anASTM standard and is intended only to provide the user of anASTM 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:D3448–85(Reapproved2005) Designation: D3448 – 10
Standard Test Method for
1
Specific Aqueous Conductance of Trichlorotrifluoroethane
This standard is issued under the fixed designation D3448; the number immediately following the designation indicates the year of
original adoption or, in the case of revision, the year of last revision.Anumber 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 aqueous conductivity due to ionizable contaminants extracted from
trichlorotrifluoroethane. The value of 1.9 µS/cm as maximum specific aqueous conductance corresponds to 0.1 ppm of chloride
ion (100 ppb). It was calculated by putting the solvent specification of 0.1 ppm chloride into the equation of the subject method
to find C − C equals 19.08. The specific conductance due to contaminants from the solvent was then calculated as follows:
2 1
~C 2 C !C 5 ~19! ~0.1! 51.9 µS/cm (1)
2 1 3
1.2 The above is exclusive of the background specific conductance of the water used in the analysis.
1.3
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 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 consult and establish appropriate safety and health practices and determine the applicability of
regulatory limitations prior to use. Specific precautionary statements are given in Section 6.
2. Summary of Test Method
2.1 Ionizable impurities in the solvent are extracted with water of known low conductivity. The increase in water conductivity
measures the amount of these impurities present.
3. Significance and Use
3.1 This test method allows for the determination of ionizable contaminants (expressed in terms of ppb of HCl) in
trichlorotrifluoroethane via measurement of specific aqueous conductance.
3.2 This test method can be used for establishing manufacturing and purchasing specifications.
4. Apparatus
2
4.1 Conductivity Bridge.
3
4.2 Conductivity Cell, dip-type. Cell constant of 0.1 reciprocal centimetre. Electrodes must be bright platinum.
4.3 Polyethylene Beaker, 250-mL.
4.4 Polyethylene Bottles, wide mouth, 300-mL and 500-mL size.
4.4.1 Calibrate and mark the outside of the 300-mL polyethylene bottles to indicate 20, 120, and 220 mL (graduate) of water
volume, using deionized water to determine the liquid levels.
4.5 Polyethylene Tubing, long enough to reach the bottom of the 300-mL polyethylene bottle.
5. Reagents
5.1 Purity of Reagents—Reagent grade chemicals shall be used in all tests. Unless otherwise indicated, it is intended that all
reagents shall conform to the specifications of the Committee on Analytical Reagents of the American Chemical Society, where
1
This test method is under the jurisdiction ofASTM Committee D26 on Halogenated Organic Solvents and Fire ExtinguishingAgents and is the direct responsibility of
Subcommittee D26.04 on Test Methods.
Current edition approved June 1, 2005.2010. Published June 2005.August 2010. Originally approved in 1975. Last previous edition approved in 20002005 as
D3448–85(2005). DOI: 10.1520/D3448-85R05.10.1520/D3448-10.
2
Serfass Model RCM-15B1 has been found satisfactory and can be obtained from Industrial Instrument Inc., Cedar Grove, NJ. An equivalent may be used.
2
The sole source of supply of the apparatus (Serfass Model RCM-15B1) known to the committee at this time is Industrial Instrument Inc., Cedar Grove, NJ. If you are
aware of alternative suppliers, please provide this information to ASTM International Headquarters. Your comments will receive careful consideration at a meeting of the
responsible technical committee, which you may attend.
3
Model Cel-A01 has been found satisfactory and can be obtained from Industrial Instrument Inc., Cedar Grove, NJ. An equivalent may be used.
3
The sole source of supply of the apparatus (Model Cel-A01) known to the committee at this time is Industrial Instrument Inc., Cedar Grove, NJ. If you are aware of
alternative suppliers, please provide this information toASTM International Headquarters.Your comments will receive careful consideration at a meeting of the responsible
technical committee, which you may attend.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.
1
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