ASTM D3634-21

Standard Test Method for Trace Chloride Ion in Engine Coolants

SIGNIFICANCE AND USE
4.1 This test method permits the determination of very low levels of chloride ion in engine coolants containing the common corrosion inhibitor, mercaptobenzothiazole, or related mercaptans, which would normally interfere with the titration by also forming insoluble silver salts with silver nitrate.
SCOPE
1.1 This test method covers the determination of chloride ion in engine coolants in the range from 5 ppm to 200 ppm in the presence of up to 0.6 weight % mercaptobenzothiazole.  
1.2 Other materials that react with silver ion will interfere.  
1.3 Chloride in engine coolants containing an aryltriazole instead of mercaptobenzothiazole can be determined directly by this test method without pretreatment with hydrogen peroxide.  
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. Specific hazards statements are given in Section 7.  
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.

General Information

• Status: Published
• Publication Date: 31-Oct-2021
• ICS: 71.100.45 - Refrigerants and antifreezes
• Technical Committee: D15 - Engine Coolants and Related Fluids
• Drafting Committee: D15.04 - Chemical Properties

Standards Content (Sample)

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: D3634 − 21
Standard Test Method for
1
Trace Chloride Ion in Engine Coolants
This standard is issued under the fixed designation D3634; 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.
This standard has been approved for use by agencies of the U.S. Department of Defense.
1. Scope E200 Practice for Preparation, Standardization, and Storage
of Standard and Reagent Solutions for ChemicalAnalysis
1.1 This test method covers the determination of chloride
3
2.2 Manufacturing Chemists’ Association Document:
ion in engine coolants in the range from 5 ppm to 200 ppm in
MCA Chemical Safety Data Sheet SD-53 Properties and
the presence of up to 0.6 weight % mercaptobenzothiazole.
Essential Information for Safe Handling and Use of
1.2 Other materials that react with silver ion will interfere.
Hydrogen Peroxide
1.3 Chloride in engine coolants containing an aryltriazole
3. Summary of Test Method
instead of mercaptobenzothiazole can be determined directly
by this test method without pretreatment with hydrogen per-
3.1 The sample is first treated at a pH of 12 to 13 with
oxide.
aqueous hydrogen peroxide to oxidize the mercaptobenzothi-
azoletosoluble,noninterferingsulfonate.Thetreatedsampleis
1.4 The values stated in SI units are to be regarded as
dissolved in glacial acetic acid and titrated potentiometrically
standard. No other units of measurement are included in this
with dilute standard silver nitrate solution. Since the solubility
standard.
of silver chloride in this system is sufficient to prevent
1.5 This standard does not purport to address all of the
obtaining a suitable inflection at the very low limit of the test
safety concerns, if any, associated with its use. It is the
method, some chloride is deliberately added to the glacial
responsibility of the user of this standard to establish appro-
acetic acid solvent and then corrected for by a blank titration.
priate safety, health, and environmental practices and deter-
mine the applicability of regulatory limitations prior to use.
4. Significance and Use
Specific hazards statements are given in Section 7.
4.1 This test method permits the determination of very low
1.6 This international standard was developed in accor-
levels of chloride ion in engine coolants containing the
dance with internationally recognized principles on standard-
commoncorrosioninhibitor,mercaptobenzothiazole,orrelated
ization established in the Decision on Principles for the
mercaptans, which would normally interfere with the titration
Development of International Standards, Guides and Recom-
by also forming insoluble silver salts with silver nitrate.
mendations issued by the World Trade Organization Technical
Barriers to Trade (TBT) Committee.
5. Apparatus
2. Referenced Documents
5.1 Manual Titrations:
2
5.1.1 pH Meter—An expanded scale pH meter which can be
2.1 ASTM Standards:
D1176 Practice for Sampling and Preparing Aqueous Solu- read to 1 mV or 2 mV is desirable but not required. A silver
4 5
billet indicator electrode and glass reference electrode are
tions of Engine Coolants orAntirusts forTesting Purposes
D1193 Specification for Reagent Water used for the chloride titration. The silver electrode should be
3
Available from American Chemistry Council (ACC), 700 Second Street, NE,
Washington, DC 20002, https://www.americanchemistry.com.
1 4
This test method is under the jurisdiction ofASTM Committee D15 on Engine ThesolesourceofsupplyoftheSilverBilletElectrodeknowntothecommittee
Coolants and Related Fluids and is the direct responsibility of Subcommittee atthistimeisFisherScientific(www.fishersci.com,CatalogNo.13-620-122).Ifyou
D15.04 on Chemical Properties. are aware of alternative suppliers, please provide this information to ASTM
Current edition approved Nov. 1, 2021. Published November 2021. Originally International Headquarters. Your comments will receive careful consideration at a
1
approved in 1977. Last previous edition approved in 2015 as D3634 – 99(2015). meeting of the responsible technical committee, which you may attend.
5
DOI: 10.1520/D3634-21. The sole source of supply of the reference electrode known to the committee at
2
For referenced ASTM standards, visit the ASTM website, www.astm.org, or this time is Fisher Scientific (www.fishersci.com, Catalog No. 13-620-216). If you
contact ASTM Customer Service at [e-mail]. For Annual Book of ASTM are aware of alternative suppliers, please provide this inf
...

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: D3634 − 99 (Reapproved 2015) D3634 − 21
Standard Test Method for
1
Trace Chloride Ion in Engine Coolants
This standard is issued under the fixed designation D3634; 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.
This standard has been approved for use by agencies of the U.S. Department of Defense.
1. Scope
1.1 This test method covers the determination of chloride ion in engine coolants in the range from 55 ppm to 200 ppm in the
presence of up to 0.6 weight % mercaptobenzothiazole.
1.2 Other materials that react with silver ion will interfere.
1.3 Chloride in engine coolants containing an aryltriazole instead of mercaptobenzothiazole can be determined directly by this test
method without pretreatment with hydrogen peroxide.
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 safety, health, and healthenvironmental practices and determine the
applicability of regulatory limitations prior to use. Specific hazards statements are given in Section 7.
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:
D1176 Practice for Sampling and Preparing Aqueous Solutions of Engine Coolants or Antirusts for Testing Purposes
D1193 Specification for Reagent Water
1
This test method is under the jurisdiction of ASTM Committee D15 on Engine Coolants and Related Fluids and is the direct responsibility of Subcommittee D15.04 on
Chemical Properties.
Current edition approved May 1, 2015Nov. 1, 2021. Published June 2015November 2021. Originally approved in 1977. Last previous edition approved in 20092015 as
D3634 – 99(2009).(2015). DOI: 10.1520/D3634-99R15.10.1520/D3634-21.
2
For referenced ASTM standards, visit the ASTM website, www.astm.org, or contact ASTM Customer Service at [e-mail]. For Annual Book of ASTM Standards
volume information, refer to the standard’sstandard’s Document Summary page on the ASTM website.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
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D3634 − 21
E200 Practice for Preparation, Standardization, and Storage of Standard and Reagent Solutions for Chemical Analysis
3
2.2 Manufacturing ChemistsChemists’ Association Document:
MCA Chemical Safety Data Sheet SD-53 SD-53Properties and Essential Information for Safe Handling and Use of Hydrogen
Peroxide
3. Summary of Test Method
3.1 The sample is first treated at a pH of 12 to 13 with aqueous hydrogen peroxide to oxidize the mercaptobenzothiazole to soluble,
noninterfering sulfonate. The treated sample is dissolved in glacial acetic acid and titrated potentiometrically with dilute standard
silver nitrate solution. Since the solubility of silver chloride in this system is sufficient to prevent obtaining a suitable inflection
at the very low limit of the test method, some chloride is deliberately added to the glacial acetic acid solvent and then corrected
for by a blank titration.
4. Significance and Use
4.1 This test method permits the determination of very low levels of chloride ion in engine coolants containing the common
corrosion inhibitor, mercaptobenzothiazole, or related mercaptans, which would normally interfere with the titration by also
forming insoluble silver salts with silver nitrate.
5. Apparatus
5.1 Manual Titrations:
5.1.1 pH Meter—An expanded scale pH meter which can be read to 11 mV or 2 mV is desirable but not required. A silver billet
4 5
indicator electrode and glass reference electrode are used for the chloride titration. The silver electrode should be polished
occasionally with fine steel wool or scouring powder and thoroughly rinsed.
5.1.2 Buret, 10-mL,10 mL, micro, Class A, calibrated in 0.02-mL0.02 mL divisions.
5.1.3 Beakers, electrolytic, 250-
...