ISO-3856-5 › 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

ISO-3856-5 - 2ND EDITION - CURRENT


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The principle consists in formation of a coloured complex from hexavalent chromium and diphenylcarbazide solution. After addition of orthophosphoric acid and sulfuric acid, spectralphotometric easurement of the colour at a wavelength in the region of 540 nm. 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 id the referee method in cases of dispute. This second edition cancels and replaces the ISO 3856/5-1980, of which it constitutes a through revision.

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87.040 (Paints and varnishes Including coating powders, paint coatings and protective paint systems)

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Document Number

ISO 3856-5:1984

Revision Level

2ND EDITION

Status

Current

Publication Date

Nov. 1, 1984

Committee Number

ISO TC 35/SC 2/WG 10