ISO 3856-4:1984 Preview
Paints and varnishes -- Determination of "soluble" metal content -- Part 4: Determination of cadmium content -- Flame atomic absorption spectrometric method and polarographic method
This standard was last reviewed and confirmed in 2012. Therefore this version remains current.
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 heigth 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.