Photometric determination of chromate. • Photometric determination with diphenylcarbazide. • In acidic medium, chromate ions react with diphenylcarbazide to form a red-violet colour complex. Chromium(III) ions are not determined unless they are converted to Cr(VI) by silver-catalysed oxidation with ammonium peroxodisulphate/ sulphuric acid. • Reaction basis analog DIN EN ISO 18412. • Type: standard test 1-25 • Range: 10 mm cuvette: 0.1 - 6.0 mg/l CrO42- / 0.1 - 3.0 mg/l Cr(VI) 50 mm cuvette: 0.01 - 1.00 mg/l CrO42- / 0.01 - 0.45 mg/l Cr(VI) • Sufficient for: 250 determinations • Sea water suitability: yes