how to determine chromate ion

Chromate Photometric Method (0-30 ppm as CrO4 )

Theory of Test

This test is based on the development of a reddish color produced by the reaction of hexavalent chromium with diphenyl carbazide.

Apparatus Required

Filter photometer complete with assorted laboratory glassware.

Chemicals Required

Chromate Reagent

Chromate Standard

Sulfuric Acid, 10%

Procedure for Test

Methanol Importance during wall wash test

Methanol is very sensitive to oil contaminants. The following test method uses methanol as a testing medium. The methanol must therefore be guaranteed free from any hydrocarbon contaminants.

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