SKC Limited Chromic Acid Test Kit - Manual (Page 8)

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Analysis
The chemicals
The kit contains the following chemicals:
•
1,5 Diphenylcarbazide 0.125g vial 10 off
• Sulphuric acid 0.25 M, 500 ml 1 off
• Acetone 250 ml 1 off
• De-ionised water 500 ml 1 off
Use only 25 mm alkali-treated filter membranes prepared in accordance with MDHS 52/3.
1,5 diphenylcarbazide solution 0.25% w/v is obtained by transferring the contents of one vial
(0.125 g) to the 60 ml plastic bottle labelled Diphenylcarbazide 0.25% w/v.
Using rhe 25 ml measuring cylinder, transfer 25 ml acetone to the bottle and swirl until the powder
has dissolved. Measure 25 ml deionised water and add to the bottle. Replace the cap tightly and
mix thoroughly.
Protect from light.
There is sufficient reagent for 25 determinations of hexavalent chromium.