Standard Test Method for
Low Concentrations of Chromium in Paint by Atomic
Absorption Spectroscopy1
This standard is issued under the fixed designation D 3718; the number immediately following the designation indicates the year of
original adoption or, in the case of revision, the year of the 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
1.1 This test method covers the determination of the content
of chromium (including chromium oxide) in the range between
0.005 and 1.0 % are present in the solids of liquid coatings or in
dried films obtained from previously coated substrates. There
is no reason to believe that higher levels could not be
determined by this test method, provided that appropriate
dilutions and adjustments in specimen size and reagent quantities are made.
1.2 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. Specific hazardstatements are given in Section 7.
2. Referenced Documents
2.1 ASTM Standards:
D 1193 Specification for Reagent Water2
D 2832 Guide for Determining Volatile and Nonvolatile
Content of Paint and Related Coatings3
3. Summary of Test Method
3.1 The sample of liquid coating or dried film is prepared
for analysis by dry ashing at 500°C followed by digestion with
potassium permanganate and sulfuric acid in a polytetrafluoroethylene (PTFE)-lined acid decomposition vessel at an
elevated temperature. The chromium in the filtered digestion
mixture is determined by atomic absorption spectroscopy.
4. Significance and Use
4.1 The permissible level of heavy metals in certain coatings is specified by governmental regulatory agencies. This test
method provides a fully documented procedure for determining
low concentrations of chromium present in both water- and
solvent-reducible coatings to determine compliance.
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