Determination of arsenic by differential pulsion cathodic stripping voltammetry on stationary mercury drop

The described method of arsenic determination based on the differential pul se cathodic dissolution stripping voltammetry of As(III) in the presence of Cu2+ ions (Anal. Chem. 55, 304 (1983)) was modified for any sample types i n contrast to the original procedure which was suitable practically only fo r very pure matrices such as drinking water. The present method is appropri ate, e.g., for arsenic determination in food, ashes, and agriculture produc ts. Due to inexpensive instrumentation, the method is easily accessible to laboratories engaged in this area.