Meaning and Use

4.1 The permissible levels of heavy metals in some coatings are regulated by governmental regulatory agencies. The test method provides a complete recording procedure for determining low levels of lead, cadmium, and cobalt in water and solvent reducible coatings to determine compliance.

ASTM D3335-85a-2020 “Standard Test Method for Determination of Low Concentrations of Lead, Cadmium, and Cobalt in Coatings by Atomic Absorption Spectrometry”

Scope

1.1 The test method covers defined coatings or inclusions in dry films that contain between 0.01% and 5% lead 2, between 50 and 150 ppm (mg/kg) cadmium and between 50 and 2000 ppm (mg/kg) cobalt in the liquid nonvolatile part. There is no reason to believe that high levels of all three elements cannot be determined by this test method with proper dilution and adjustment for sample size and reagent number.

1.2 Only pigmented coatings were used to evaluate the test method, but there is no reason to believe that varnishes and varnishes could not be successfully analyzed if appropriate precautions were taken.

1.3 This test method is not suitable for the determination of lead in samples containing antimony pigments (low recovery rate).

1.4 If the lead in the sample to be analyzed is in the form of an organolead compound at a concentration greater than 0.1%, a small amount of lead loss may occur, resulting in a slightly lower accuracy than shown in Section 12.

ASTM D3335-85a-2020 “Standard Test Method for Determination of Low Concentrations of Lead, Cadmium, and Cobalt in Coatings by Atomic Absorption Spectrometry”

1.5 Values expressed in SI units should be considered standard values. The values given in parentheses are for reference only.

1.6 This standard is not intended to address all safety issues related to use. It is the responsibility of the user of this standard to establish appropriate safety, health and environmental specifications and to determine the applicability of regulatory restrictions prior to use. The specific harm specification is given in Section 7.

1.7 This international standard has been developed in accordance with the internationally recognized standardization principles established in the Decision on Principles for the Development of International Standards, Guidelines and Recommendations issued by the Technical Barriers to Trade (TBT) Committee of the World Trade Organization.

2. Refer to documents

ASTM standard

D1193 Reagent water specification

D2832 Guide for the determination of volatile and non-volatile content of paints and related coatings