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Paints and varnishes - Determination of soluble metal content - Part 5 : Determination of hexavalent chromium content of the pigment portion of the liquid paint or the paint in powder form - Diphenylcarbazide spectrophotometric method
The principle consists in formation of a coloured complex from hexavalent chromium and diphenylcarbazide solution.
After addition of orthophosphoric acid and sulfuric acid, spectral photometric measurement of the colour at a wavelength in the region of 540 nm is performed.
The method is applicable to coating materials having hexavalent chromium contents in the range of about 0.05 % (m/m) to 5 % (m/m).
This method is the referee method in cases of dispute.
This second edition cancels and replaces the ISO 3856/5-1980, of which it constitutes a thorough revision.
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