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ARSENIC DETERMINATION BY THE SILVER DIETHYLDITHIOCARBAMATE METHOD AND THE ELIMINATION OF METAL ION INTERFERENCE
Citation:
Sandhu, S. ARSENIC DETERMINATION BY THE SILVER DIETHYLDITHIOCARBAMATE METHOD AND THE ELIMINATION OF METAL ION INTERFERENCE. U.S. Environmental Protection Agency, Washington, D.C., EPA/600/4-78/038.
Description:
The interference of metals with the determination of arsenic by the silver diethyldithiocarbamate (SDDC) Method was investigated. Low recoveries of arsenic are obtained when cobalt, chromium, molybdenum, nitrate, nickel or phosphate are at concentrations of 7 mg/l or above (individually or collectively). A positive interference is obtained when the concentration of antimony is 0.3 mg/l or above and the concentration of mercury is 1.5 mg/l or above. Prevention of antimony and mercury interference was found to be possible by removal with an ion exchange resin. Potassium permanganate digestion at 35C was found to be reliable.