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NANOCOLOR® Chromate 5
Photometric determination of chromate

Photometric determination with diphenyl-carbazide

In acidic medium, chromate ions react with diphenylcarbazide (lyophilised in the tube test) 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.
Data and ordering information
Cat. No. 985 024
Type tube test 0-24
Range 0.1 - 4.0 mg/l CrO42-
0.05 - 2.00 mg/l Cr(VI)

when using semi-micro cuvettes 50 mm
(Cat. No. 919 50):
0.01 – 1.00 mg/l CrO42-
0.005 – 0.500 mg/l Cr(VI)
Sufficient for 20 determinations
Shelf life at least 2 years
Sea water suitability yes
  
     
  
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