ASTM D6129-97(2002)

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

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.
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: 09-May-1997
• ICS: 71.100.45 - Refrigerants and antifreezes
• Technical Committee: D15 - Engine Coolants and Related Fluids
• Drafting Committee: D15.04 - Chemical Properties

Relations

• Replaces: ASTM D6129-97 - Standard Test Method for Silicon in Engine Coolant Concentrates by Atomic Absorption Spectroscopy
• Effective Date: 10-May-1997
• Replaced By: ASTM D6129-97(2007) - Standard Test Method for Silicon in Engine Coolant Concentrates by Atomic Absorption Spectroscopy
• Effective Date: 01-Apr-2007
• Referred By: ASTM D4985-10(2023) - Standard Specification for Low Silicate Ethylene Glycol Base Engine Coolant for Heavy Duty Engines Requiring a Pre-Charge of Supplemental Coolant Additive (SCA)
• Effective Date: 10-May-1997
• Referred By: ASTM D5752-10(2017) - Standard Specification for Supplemental Coolant Additives (SCAs) for Use in Precharging Coolants for Heavy-Duty Engines
• Effective Date: 10-May-1997

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NOTICE: This standard has either been superseded and replaced by a new version or withdrawn.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 2002)
Standard Test Method for
Silicon in Engine Coolant Concentrates by Atomic
Absorption Spectroscopy
This standard is issued under the fixed designation D 6129; 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 (e) indicates an editorial change since the last revision or reapproval.
1. Scope 5. Reagents
1.1 This test method covers the determination of silicon in 5.1 Reagent grade chemicals shall be used in all tests.
the range from 200 to 500 ppm in engine coolant concentrates 5.2 References to water shall be understood to mean dis-
byatomicabsorption.Thismethodisasaccurateandpreciseas tilled water or water of equal quality.
photometric methods, while requiring considerably less opera- 5.3 Standard Silicon Solution, 1000 mg/L (see Note 1).
tor time and avoiding problems with reagent instability. 5.4 Ethylene Glycol (propylene glycol should be used when
1.1.1 Coolants with silicon content outside of this range analyzing PG-based coolants).
may be analyzed by this method by suitably adjusting the 5.5 Sodium Hydroxide, 5 % in water (see Note 1). When
sample size. Care should be taken to ensure that the glycol preparing from solid sodium hydroxide avoid prolonged expo-
content of the working standards corresponds to that of the sure to the atmosphere. DO NOT STORE IN GLASS.
sample solution being analyzed. 5.6 Working standards: 0, 20, 40, and 60 mg/L silicon.
1.2 The values stated in SI units are to be regarded as the 5.6.1 Prepare these solutions by pipeting 2.0, 4.0, and 6.0
standard. mL of the 1000 mg/L standard silicon solution into separate
1.3 This standard does not purport to address all of the 100 mLvolumetric flasks.Add 10.0 mLof ethylene glycol and
safety concerns, if any, associated with its use. It is the 2.0 mL of 5 % sodium hydroxide solution to each flask and
responsibility of the user of this standard to establish appro- dilute to volume with water. Prepare the zero standard solution
priate safety and health practices and determine the applica- by adding 10.0 mL ethylene glycol and 2.0 mL 5 % sodium
bility of regulatory limitations prior to use. hydroxide solution to another 100 mL volumetric flask and
diluting to volume with water.
2. Referenced Documents
NOTE 1—Standardsiliconsolutionsandsodiumhydroxidesolutionsare
2.1 ASTM Standards:
available from most laboratory supply companies.
D 1176 Test Method for Sampling and Preparing Aqueous
Solutions of Engine Coolants or Antirusts for Testing 6. Sampling
Purposes
6.1 Sample material in accordance with Test Method
D 1176.
3. Summary of Test Method
3.1 The sample is dissolved in water and the silicon content 7. Procedure
is determined from a standard curve established at the time the
7.1 Tothenearest0.001g,weigh5gofsampleintoa50mL
sample is run. An atomic absorption spectrometer with a
volumetric flask. Dissolve in and dilute to volume with water.
nitrous oxide-acetylene flame is used.
7.2 Using the nitrous oxide-acetylene flame, optimize the
instrumentoperatingconditionsforsilicondeterminationatthe
4. Apparatus
251.6 nm spectral line according to the manufacturer’s recom-
4.1 Atomic Absorption Spectrometer, with nitrous oxide-
mendations.
acetylene flame.
4.2 Hollow-Cathode Lamp, for silicon.
1 3
This specification is under the jurisdiction ofASTM Committee D15 on Engine Reagent Chemicals, American Chemical Society Specifications, American
Coolants and is the direct responsibility of Subcommittee D15.04 on Chemical Chemical Society, Washington, DC. For suggestions on the testing of reagents not
Properties. listed by the American Chemical Society, se
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