4.1 Hexavalent chromium salts are used extensively in metal finishing and plating applications, in anodizing aluminum, and in the manufacture of paints, dyes, explosives, and ceramics. Trivalent chromium salts are used as mordants in textile dyeing, in the ceramic and glass industry, in the leather industry as a tanning agent, and in photography. Chromium may be present in wastewater from these industries and may also be discharged from chromate-treated cooling waters.
4.2 The hexavalent state of chromium is toxic to humans, animals, and aquatic life. It can produce lung tumors when inhaled and readily induces skin sensitization.
1.1 These test methods cover the determination of hexavalent and total chromium in water. Section 34 on Quality Control pertains to these test methods. Three test methods are included as follows:
Test Method | Concentration | Sections |
A—Photometric Diphenyl- | 8199;0.01 to 0.5 mg/L | 8199;7 – 15 |
B—Atomic Absorption, | 8199;0.1 to 10 mg/L | 16 – 24 |
C—Atomic Absorption, Graphite | 8199;5 to 100 μg/L | 25 –
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