VISOCOLOR® ECO Chromium • Colorimetric determination of chromium (VI) • In sulphuric acid chromate ions react with diphenylcarbazide to form a red-violet dye. • (Reaction basis according to DIN EN ISO 7393 G4-2) Type: colorimetric test kit Range: 0.02 · 0.05 · 0.10 · 0.15 · 0.20 · 0.30 · 0.40 · 0.50 mg/l Cr(VI) Sufficient for: 140 determinations Shelf life at least: 1.5 years Sea water suitability: yes Detectable with PF-12: yes • Chromium compounds can be present in industrial waste waters in trivalent form [chromium(III) ions] and in hexavalent form (chromate and dichromate ions). • In order to determine the total chromium all other valencies must be oxidised to chromium(VI). • Each test kit is equipped with a detailed description.