ASTM D6129-97(2007)
(Test Method)Standard Test Method for Silicon in Engine Coolant Concentrates by Atomic Absorption Spectroscopy
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 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.
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NOTICE: This standard has either been superseded and replaced by a new version or withdrawn.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 2007)
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 4.2 Hollow-Cathode Lamp, for silicon.
1.1 This test method covers the determination of silicon in
5. Reagents
the range from 200 to 500 ppm in engine coolant concentrates
5.1 Reagent grade chemicals shall be used in all tests.
byatomicabsorption.Thismethodisasaccurateandpreciseas
5.2 References to water shall be understood to mean dis-
photometric methods, while requiring considerably less opera-
tilled water or water of equal quality.
tor time and avoiding problems with reagent instability.
1.1.1 Coolants with silicon content outside of this range
5.3 Standard Silicon Solution, 1000 mg/L (see Note 1).
may be analyzed by this method by suitably adjusting the
5.4 Ethylene Glycol (propylene glycol should be used when
sample size. Care should be taken to ensure that the glycol
analyzing PG-based coolants).
content of the working standards corresponds to that of the
5.5 Sodium Hydroxide, 5 % in water (see Note 1). When
sample solution being analyzed.
preparing from solid sodium hydroxide avoid prolonged expo-
1.2 The values stated in SI units are to be regarded as the
sure to the atmosphere. DO NOT STORE IN GLASS.
standard.
5.6 Working standards: 0, 20, 40, and 60 mg/L silicon.
1.3 This standard does not purport to address all of the
5.6.1 Prepare these solutions by pipeting 2.0, 4.0, and 6.0
safety concerns, if any, associated with its use. It is the
mL of the 1000 mg/L standard silicon solution into separate
responsibility of the user of this standard to establish appro-
100 mLvolumetric flasks.Add 10.0 mLof ethylene glycol and
priate safety and health practices and determine the applica-
2.0 mL of 5 % sodium hydroxide solution to each flask and
bility of regulatory limitations prior to use.
dilute to volume with water. Prepare the zero standard solution
2. Referenced Documents
by adding 10.0 mL ethylene glycol and 2.0 mL 5 % sodium
hydroxide solution to another 100 mL volumetric flask and
2.1 ASTM Standards:
diluting to volume with water.
D1176 Practice for Sampling and Preparing Aqueous Solu-
tions of Engine Coolants orAntirusts forTesting Purposes
NOTE1—Standardsiliconsolutionsandsodiumhydroxidesolutionsare
available from most laboratory supply companies.
3. Summary of Test Method
6. Sampling
3.1 The sample is dissolved in water and the silicon content
6.1 Sample material in accordance with Test Method
is determined from a standard curve established at the time the
D1176.
sample is run. An atomic absorption spectrometer with a
nitrous oxide-acetylene flame is used.
7. Procedure
4. Apparatus
7.1 Tothenearest0.001g,weigh5gofsampleintoa50mL
volumetric flask. Dissolve in and dilute to volume with water.
4.1 Atomic Absorption Spectrometer, with nitrous oxide-
acetylene flame.
7.2 Using the nitrous oxide-acetylene flame, optimize the
instrumentoperatingconditionsforsilicondeterminationatthe
This specification is under the jurisdiction ofASTM Committee D15 on Engine
251.6 nm spectral line according to the manufacturer’s recom-
Coolants and Related Fluids and is the direct responsibility of Subcommittee
mendations.
D15.04 on Chemical Properties.
Current edition approved April 1, 2007. Published April 2007. Originally
approved in 1997. Last previous edition approved in 2002 as D6129 - 97(2002). Reagent Chemicals, American Chemical Society Specifications, American
DOI: 10.1520/D6129-97R07. Chemical Society, Washington, DC. For suggestions on the testing of reagents not
For referenced ASTM standards, visi
...
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