NANOCOLOR® Chromate

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

Data and ordering information
Cat. No. 918 25
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
Shelf life at least 2 years
Sea water suitability yes