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Paints and varnishes - Determination of soluble metal content - Part 4: Determination of cadmium content - Flame atomic absorption spectrometric method and polarographic method
The principle of the AAS method consists in inspiration of the test solution into an acetylen/air flame.
Measurement of the absorption of the selected spectral line emitted by a cadmium hollow-cathode or cadmium discharge lamp, in the region of 228,8 nm.
The principle of the polarographic method consists in electrolysis of the test solution in a polarographic cell measurement of the corresponding height of the potential step.
The method are applicable to coating materials having "soluble" cadmium contents in the range of about 0,05 % (m/m) to 5 % (m/m).
The AAS method should be used as the referee method in cases of dispute.
This second edition cancels and replaces ISO 3856/4-1980.
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