ASTM D7959-24
(Test Method)Standard Test Method for Chloride Content Determination of Aviation Turbine Fuels using Chloride Test Strip
Standard Test Method for Chloride Content Determination of Aviation Turbine Fuels using Chloride Test Strip
SIGNIFICANCE AND USE
5.1 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 aircraft fuel control systems leading to engine failure.4
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 0.5 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, 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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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: D7959 − 24
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* 2.2 ASTM Adjuncts:
3
Distillate Fuel Bar Chart
1.1 This test method covers a rapid means of determining
chloride content of aviation turbine fuel. This methodology is
3. Terminology
applicable for chloride concentrations between 0 mg ⁄L to
0.5 mg ⁄L. This methodology will not detect chlorine originat-
3.1 Definitions:
ing from chlorinated organic compounds (that is, covalent
3.1.1 For definitions of terms used in this test method, refer
bond).
to Terminology D4175.
1.2 The values stated in SI units are to be regarded as
standard. No other units of measurement are included in this 4. Summary of Test Method
standard.
4.1 A 3 L sample of aviation turbine fuel is extracted with
1.3 This standard does not purport to address all of the
pH 7 buffer solution by a magnetic stir plate and stir bar. The
safety concerns, if any, associated with its use. It is the
chloride in the aviation turbine fuel sample transfers to the
responsibility of the user of this standard to establish appro-
buffer solution. A portion of the aqueous extract solution is
priate safety, health, and environmental practices and deter-
then removed and analyzed with a chloride test strip. Silver
mine the applicability of regulatory limitations prior to use.
ions within the test strip combine with chloride ions in the
1.4 This international standard was developed in accor-
extract as it is drawn up by capillary action to form a white
dance with internationally recognized principles on standard-
column of silver chloride. The chloride concentration of the
ization established in the Decision on Principles for the
extract, determined by the height of the column, is then related
Development of International Standards, Guides and Recom-
back to the chloride content of the aviation turbine fuel sample.
mendations issued by the World Trade Organization Technical
Barriers to Trade (TBT) Committee.
5. Significance and Use
2. Referenced Documents 5.1 Chloride present in aviation turbine fuel can originate
from refinery salt drier carryover or possibly from seawater
2
2.1 ASTM Standards:
contamination (for example, product transferred by barge).
D4175 Terminology Relating to Petroleum Products, Liquid
Elevated chloride levels have caused corrosive and abrasive
Fuels, and Lubricants
4
wear of aircraft fuel control systems leading to engine failure.
D6300 Practice for Determination of Precision and Bias
Data for Use in Test Methods for Petroleum Products,
6. Interferences
Liquid Fuels, and Lubricants
6.1 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
1
This test method is under the jurisdiction of ASTM Committee D02 on
no reading on the chloride test strip.
Petroleum Products, Liquid Fuels, and Lubricants and is the direct responsibility of
Subcommittee D02.J0.05 on Fuel Cleanliness.
Current edition approved March 1, 2024. Published March 2024. Originally
approved in 2015. Last previous edition approved in 2019 as D7959 – 19. DOI:
3
10.1520/D7959-24. Available from ASTM International Headquarters. Order Adjunct No.
2
For referenced ASTM standards, visit the ASTM website, www.astm.org, or ADJD417601. Original adjunct produced in 1991.
4
contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM Guidelines for Sodium Chloride Contamination Troubleshooting and Decon-
Standards volume information, refer to the standard’s Document Summary page on tamination of Airframe and Engine Fuel Systems, International Air Transport
the ASTM website. 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
1
---------------------- Page: 1 ----------------------
D7959 − 24
5
6.2 The test strip will react with halides other than chloride 12.2 Add 3 L of the aviation turbine fuel test sample to a 4 L
(for example, bromide, iodide). The concentration of chloride beaker by filling and emptying a 1 L grad
...
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: D7959 − 19 D7959 − 24
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 0.5 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, 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.
2. Referenced Documents
2
2.1 ASTM Standards:
D4175 Terminology Relating to Petroleum Products, Liquid Fuels, and Lubricants
D6300 Practice for Determination of Precision and Bias Data for Use in Test Methods for Petroleum Products, Liquid Fuels, and
Lubricants
2.2 ASTM Adjuncts:
3
Distillate Fuel Bar Chart
3. Terminology
3.1 Definitions:
3.1.1 For definitions of terms used in this test method, refer to Terminology D4175.
4. Summary of Test Method
4.1 A 3 L sample of aviation turbine fuel is extracted with pH 7 buffer solution by a magnetic stir plate and stir bar. The chloride
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 May 1, 2019March 1, 2024. Published June 2019March 2024. Originally approved in 2015. Last previous edition approved in 20162019 as
D7959 – 16.D7959 – 19. DOI: 10.1520/D7959-19.10.1520/D7959-24.
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.
*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 ----------------------
D7959 − 24
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.
5. Significance and Use
5.1 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.
6. Interferences
6.1 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.
5
6.2 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, however, is in great excess compared to
...
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