ASTM D6129-97(2015)

Standard Test Method for Silicon in Engine Coolant Concentrates by Atomic Absorption Spectroscopy

ABSTRACT
This standard test method covers the determination of silicon in engine coolant concentrates by atomic absorption spectroscopy. Apparatus and reagents used for this test method include atomic absorption spectrometer, hollow-cathode lamp, reagent grade chemicals, standard silicon solution, ethylene glycol or propylene glycol, and sodium hydroxide. Silicon content shall be determined from an established standard curve and an atomic absorption spectrometer. A nitrous oxide-acetylene flame shall be used.
SCOPE
1.1 This test method covers the determination of silicon in the range from 200 to 500 ppm in engine coolant concentrates by atomic absorption. This method is as accurate and precise as photometric methods, while requiring considerably less operator time and avoiding problems with reagent instability.  
1.1.1 Coolants with silicon content outside of this range may be analyzed by this method by suitably adjusting the sample size. Care should be taken to ensure that the glycol content of the working standards corresponds to that of the sample solution being analyzed.  
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 and health practices and determine the applicability of regulatory limitations prior to use.

General Information

• Status: Historical
• Publication Date: 30-Apr-2015
• ICS: 71.100.45 - Refrigerants and antifreezes
• Technical Committee: D15 - Engine Coolants and Related Fluids
• Drafting Committee: D15.04 - Chemical Properties

Standards Content (Sample)

NOTICE: This standard has either been superseded and replaced by a new version or withdrawn.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: D6129 − 97 (Reapproved 2015)
Standard Test Method for
Silicon in Engine Coolant Concentrates by Atomic
Absorption Spectroscopy
This standard is issued under the fixed designation D6129; 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 4. Apparatus
4.1 Atomic Absorption Spectrometer, with nitrous oxide-
1.1 This test method covers the determination of silicon in
acetylene flame.
the range from 200 to 500 ppm in engine coolant concentrates
byatomicabsorption.Thismethodisasaccurateandpreciseas
4.2 Hollow-Cathode Lamp, for silicon.
photometric methods, while requiring considerably less opera-
tor time and avoiding problems with reagent instability.
5. Reagents
1.1.1 Coolants with silicon content outside of this range
5.1 Reagent grade chemicals shall be used in all tests.
may be analyzed by this method by suitably adjusting the
5.2 References to water shall be understood to mean dis-
sample size. Care should be taken to ensure that the glycol
tilled water or water of equal quality.
content of the working standards corresponds to that of the
sample solution being analyzed. 5.3 Standard Silicon Solution, 1000 mg/L (see Note 1).
5.4 Ethylene Glycol (propylene glycol should be used when
1.2 The values stated in SI units are to be regarded as
analyzing PG-based coolants).
standard. No other units of measurement are included in this
standard.
5.5 Sodium Hydroxide, 5 % in water (see Note 1). When
preparing from solid sodium hydroxide avoid prolonged expo-
1.3 This standard does not purport to address all of the
sure to the atmosphere. DO NOT STORE IN GLASS.
safety concerns, if any, associated with its use. It is the
responsibility of the user of this standard to establish appro-
5.6 Working standards: 0, 20, 40, and 60 mg/L silicon.
priate safety and health practices and determine the applica-
5.6.1 Prepare these solutions by pipeting 2.0, 4.0, and 6.0
bility of regulatory limitations prior to use.
mL of the 1000 mg/L standard silicon solution into separate
100 mLvolumetric flasks.Add 10.0 mLof ethylene glycol and
2. Referenced Documents
2.0 mL of 5 % sodium hydroxide solution to each flask and
2 dilute to volume with water. Prepare the zero standard solution
2.1 ASTM Standards:
by adding 10.0 mL ethylene glycol and 2.0 mL 5 % sodium
D1176 Practice for Sampling and Preparing Aqueous Solu-
hydroxide solution to another 100 mL volumetric flask and
tions of Engine Coolants orAntirusts forTesting Purposes
diluting to volume with water.
3. Summary of Test Method
NOTE1—Standardsiliconsolutionsandsodiumhydroxidesolutionsare
available from most laboratory supply companies.
3.1 The sample is dissolved in water and the silicon content
is determined from a standard curve established at the time the
6. Sampling
sample is run. An atomic absorption spectrometer with a
6.1 Sample material in accordance with Practice D1176.
nitrous oxide-acetylene flame is used.
7. Procedure
7.1 Tothenearest0.001g,weigh5gofsampleintoa50mL
This test method is under the jurisdiction ofASTM Committee D15 on Engine
volumetric flask. Dissolve in and dilute to volume with water.
Coolants and Related Fluids and is the direct responsibility of Subcommittee
D15.04 on Chemical Properties.
Current edition approved May 1, 2015. Published June 2015. Originally
approved in 1997. Last previous edition approved in 2007 as D6129 - 97(2007). Reagent Chemicals, American Chemical Society Specifications, American
DOI: 10.1520/D6129-97R15. Chemical Society, Washington, DC. For suggestions on the testing of reagents not
For referenced ASTM standards, visit the ASTM website, www.astm.org, or listed by the American Chemical Society, see Analar Standards for Laboratory
contact ASTM Customer Service at [e-mail]. For Annual Book of ASTM Chemicals, BD
...

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: D6129 − 97 (Reapproved 2007) D6129 − 97 (Reapproved 2015)
Standard Test Method for
Silicon in Engine Coolant Concentrates by Atomic
Absorption Spectroscopy
This standard is issued under the fixed designation D6129; 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 silicon in the range from 200 to 500 ppm in engine coolant concentrates by
atomic absorption. This method is as accurate and precise as photometric methods, while requiring considerably less operator time
and avoiding problems with reagent instability.
1.1.1 Coolants with silicon content outside of this range may be analyzed by this method by suitably adjusting the sample size.
Care should be taken to ensure that the glycol content of the working standards corresponds to that of the sample solution being
analyzed.
1.2 The values stated in SI units are to be regarded as the 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 and health practices and determine the applicability of regulatory
limitations prior to use.
2. Referenced Documents
2.1 ASTM Standards:
D1176 Practice for Sampling and Preparing Aqueous Solutions of Engine Coolants or Antirusts for Testing Purposes
3. Summary of Test Method
3.1 The sample is dissolved in water and the silicon content is determined from a standard curve established at the time the
sample is run. An atomic absorption spectrometer with a nitrous oxide-acetylene flame is used.
4. Apparatus
4.1 Atomic Absorption Spectrometer, with nitrous oxide-acetylene flame.
4.2 Hollow-Cathode Lamp, for silicon.
5. Reagents
5.1 Reagent grade chemicals shall be used in all tests.
5.2 References to water shall be understood to mean distilled water or water of equal quality.
5.3 Standard Silicon Solution, 1000 mg/L (see Note 1).
5.4 Ethylene Glycol (propylene glycol should be used when analyzing PG-based coolants).
5.5 Sodium Hydroxide, 5 % in water (see Note 1). When preparing from solid sodium hydroxide avoid prolonged exposure to
the atmosphere. DO NOT STORE IN GLASS.
5.6 Working standards: 0, 20, 40, and 60 mg/L silicon.
This specification 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 April 1, 2007May 1, 2015. Published April 2007June 2015. Originally approved in 1997. Last previous edition approved in 20022007 as
D6129D6129 - 97 - 97(2002). (2007). DOI: 10.1520/D6129-97R07.10.1520/D6129-97R15.
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’s Document Summary page on the ASTM website.
Reagent Chemicals, American Chemical Society Specifications, American Chemical Society, Washington, DC. For suggestions on the testing of reagents not listed by
the American Chemical Society, see Analar Standards for Laboratory Chemicals, BDH Ltd., Poole, Dorset, U.K., and the United States Pharmacopeia and National
Formulatory, U.S. Pharmacopeial Convention, Inc. (USPC) Rockville, MD.
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D6129 − 97 (2015)
5.6.1 Prepare these solutions by pipeting 2.0, 4.0, and 6.0 mL of the 1000 mg/L standard silicon solution into separate 100 mL
volumetric flasks. Add 10.0 mL of ethylene glycol and 2.0
...