标准摘要
[中文适用范围]： 其原理在于由六价铬和二苯卡巴肼溶液形成有色络合物。 添加正磷酸和硫酸后，在540 nm区域的波长处进行分光光度测量。 该方法适用于六价铬含量在约0.05％(m/m)至5％(m/m)范围内的涂料。 该方法是出现争议时的裁判方法。 第二版取消并取代了 ISO 3856/5-1980，它构成了 ISO 3856/5-1980 的彻底修订版。 [外文原描述]： 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.
英文名称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