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View Actual EPA Method 7198 (PDF File)
EPA Method 7198:CHROMIUM, HEXAVALENT (DIFFERENTIAL PULSE POLAROGRAPHY)
Summary:Method 7198 measures the peak current produced from the reduction of Cr(VI) to Cr(III) at a dropping mercury electrode during a differential pulse voltage ramp.
Scope:This method is used to determine the concentration of hexavalent chromium [Cr(VI)] in natural and waste waters and in EP extracts.
Report Number:SW-846 Ch 3.3