EPA Method 7196A

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EPA Method 7196A:
CHROMIUM, HEXAVALENT (COLORIMETRIC)

Summary:
Dissolved hexavalent chromium, in the absence of interfering amounts of substances such as molybdenum, vanadium, and mercury, may be determined colorimetrically by reaction with diphenylcarbazide in acid solution. A redviolet color of unknown composition is produced. The reaction is very sensitive, the absorbancy index per gram atom of chromium being about 40,000 at 540 nm. Addition of an excess of diphenylcarbazide yields the red-violet product, and its absorbance is measured photometrically at 540 nm.

Scope:
Method 7196 is used to determine the concentration of dissolved hexavalent chromium [Cr(VI)] in EP/TCLP characteristic extracts and ground waters. This method may also be applicable to certain domestic and industrial wastes, provided that no interfering substances are present.

Test Description:
Chromium, Hexavalent

Report Number:
SW-846 Ch 3.3

Instrument used for this test:
Discrete-FIA