Chromate (hexavalent) Test Kits

Visual Kits

Range MDL Method Kit Catalog No. Refill Catalog No.
0-1 & 1-10 ppm 0.05 ppm Diphenylcarbazide K-2810 R-2810

Instrumental Kits

Range Method Kit Catalog No.
0-3.50 ppm Diphenylcarbazide K-2803



Hexavalent chromium salts are used in numerous industrial processes. They are also used extensively as corrosion inhibitors in open and closed cooling water systems


The Diphenylcarbazide Method


References: APHA Standard Methods, 22nded., Method 3500-Cr B- 2009. ASTM D 1687-02, Chromium in Water, Test Method A.


With the chromate test method, hexavalent chromium reacts with diphenylcarbazide under acid conditions to form a red-violet color. Results are expressed as ppm (mg/L) CrO4.