ASTM D7959-19

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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: D7959 − 16 D7959 − 19 An American National Standard
Standard Test Method for
Chloride Content Determination of Aviation Turbine Fuels
1
using Chloride Test Strip
This standard is issued under the fixed designation D7959; 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 a rapid means of determining chloride content of aviation turbine fuel. This methodology is
applicable for chloride concentrations between 0 mg ⁄L to 0.3 mg0.5 mg ⁄L. This methodology will not detect chlorine originating
from chlorinated organic compounds (that is, covalent bond).
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 safety, health, and healthenvironmental 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.
2. Referenced Documents
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2.1 ASTM Standards:
D6300 Practice for Determination of Precision and Bias Data for Use in Test Methods for Petroleum Products and Lubricants
2.2 ASTM Adjuncts:
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Distillate Fuel Bar Chart
3. Summary of Test Method
3.1 A 3 L 3 L sample of aviation turbine fuel is extracted with pH 7 buffer solution by a magnetic stir plate and stir bar. The
chloride in the aviation turbine fuel sample transfers to the buffer solution. A portion of the aqueous extract solution is then
removed and analyzed with a chloride test strip. Silver ions within the test strip combine with chloride ions in the extract as it is
drawn up by capillary action to form a white column of silver chloride. The chloride concentration of the extract, determined by
the height of the column, is then related back to the chloride content of the aviation turbine fuel sample.
4. Significance and Use
4.1 Chloride present in aviation turbine fuel can originate from refinery salt drier carryover or possibly from seawater
contamination (for example, product transferred by barge). Elevated chloride levels have caused corrosive and abrasive wear of
4
aircraft fuel control systems leading to engine failure.
5. Interferences
5.1 Some pH 7 buffer solution can contain trace levels of chloride compounds and therefore produce a false positive reading
on the chloride test strip. Prior to using a new batch of pH 7 buffer solution, a sample should be confirmed to produce no reading
on the chloride test strip.
1
This test method is under the jurisdiction of ASTM Committee D02 on Petroleum Products, Liquid Fuels, and Lubricants and is the direct responsibility of Subcommittee
D02.J0.05 on Fuel Cleanliness.
Current edition approved Dec. 1, 2016May 1, 2019. Published January 2017June 2019. Originally approved in 2015. Last previous edition approved in 20152016 as
D7959 – 15.D7959 – 16. DOI: 10.1520/D7959-16.10.1520/D7959-19.
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 ASTM International Headquarters. Order Adjunct No. ADJD417601. Original adjunct produced in 1991.
4
Guidelines for Sodium Chloride Contamination Troubleshooting and Decontamination of Airframe and Engine Fuel Systems, International Air Transport Association,
2nd Ed., February 1998, pg. 1.
*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
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D7959 − 19
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5.2 The test strip will react with halides other than chloride (for example, bromide, iodide). The concentration of chloride in
salt used in refinery salt driers (predominantly NaCl and CaCl ) and in seawater, how
...

NOTICE: This standard has either been superseded and replaced by a new version or withdrawn.
Contact ASTM International (www.astm.org) for the latest information
Designation: D7959 − 19
Standard Test Method for
Chloride Content Determination of Aviation Turbine Fuels
1
using Chloride Test Strip
This standard is issued under the fixed designation D7959; 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* 3. Summary of Test Method
1.1 This test method covers a rapid means of determining
3.1 A 3 L sample of aviation turbine fuel is extracted with
chloride content of aviation turbine fuel. This methodology is
pH 7 buffer solution by a magnetic stir plate and stir bar. The
applicable for chloride concentrations between 0 mg ⁄L to
chloride in the aviation turbine fuel sample transfers to the
0.5 mg ⁄L. This methodology will not detect chlorine originat-
buffer solution. A portion of the aqueous extract solution is
ing from chlorinated organic compounds (that is, covalent
then removed and analyzed with a chloride test strip. Silver
bond).
ions within the test strip combine with chloride ions in the
1.2 The values stated in SI units are to be regarded as extract as it is drawn up by capillary action to form a white
standard. No other units of measurement are included in this
column of silver chloride. The chloride concentration of the
standard.
extract, determined by the height of the column, is then related
back to the chloride content of the aviation turbine fuel sample.
1.3 This standard does not purport to address all of the
safety concerns, if any, associated with its use. It is the
4. Significance and Use
responsibility of the user of this standard to establish appro-
priate safety, health, and environmental practices and deter-
4.1 Chloride present in aviation turbine fuel can originate
mine the applicability of regulatory limitations prior to use.
from refinery salt drier carryover or possibly from seawater
1.4 This international standard was developed in accor-
contamination (for example, product transferred by barge).
dance with internationally recognized principles on standard-
Elevated chloride levels have caused corrosive and abrasive
ization established in the Decision on Principles for the
4
wear of aircraft fuel control systems leading to engine failure.
Development of International Standards, Guides and Recom-
mendations issued by the World Trade Organization Technical
5. Interferences
Barriers to Trade (TBT) Committee.
5.1 Some pH 7 buffer solution can contain trace levels of
2. Referenced Documents
chloride compounds and therefore produce a false positive
2
reading on the chloride test strip. Prior to using a new batch of
2.1 ASTM Standards:
D6300 Practice for Determination of Precision and Bias pH 7 buffer solution, a sample should be confirmed to produce
Data for Use in Test Methods for Petroleum Products, no reading on the chloride test strip.
Liquid Fuels, and Lubricants
5
5.2 The test strip will react with halides other than chloride
2.2 ASTM Adjuncts:
(for example, bromide, iodide). The concentration of chloride
3
Distillate Fuel Bar Chart
in salt used in refinery salt driers (predominantly NaCl and
CaCl ) and in seawater, however, is in great excess compared
2
to that of other halides.
1
This test method is under the jurisdiction of ASTM Committee D02 on
Petroleum Products, Liquid Fuels, and Lubricants and is the direct responsibility of
Subcommittee D02.J0.05 on Fuel Cleanliness.
4
Current edition approved May 1, 2019. Published June 2019. Originally Guidelines for Sodium Chloride Contamination Troubleshooting and Decon-
approved in 2015. Last previous edition approved in 2016 as D7959 – 16. DOI: tamination of Airframe and Engine Fuel Systems, International Air Transport
10.1520/D7959-19. Association, 2nd Ed., February 1998, pg. 1.
2 5
For referenced ASTM standards, visit the ASTM website, www.astm.org, or The sole source of supply of the apparatus (Chloride QuanTab (trademarked)
contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM Test Strips, 30 – 600 mg/L) known to the committee at this time is Hach Company,
Standards volume information, refer to the standard’s Document Summary page on P.O. Box 389, Loveland, Colorado 80539-0389, http://www.hach.com. If you are
the ASTM website. aware of alternative suppliers, please provide this information to ASTM Interna-
3
Available from ASTM International Headquarters. Order Adjunct No. tional Headquarters. Your comments will receive careful consideration at a meeting
1
ADJD417601. Original adjunct produced in 1991. of the responsible technical committee, which you may attend.
*A Summary of Changes section appears at the end of this standard
Copyright © ASTM Internatio
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