US EPA

1359134 

Journal Article 

Differential pulse polarographic determination of inorganic and organic arsenic in natural waters 

Buldini, PL; Ferri, D; Zini, Q 

1980 

1 

Microchimica Acta
ISSN: 0026-3672
EISSN: 1436-5073 

HEEP/81/02463 

1 

1-2 

1-2 

WOS:A1980JY39900007 

HEEP COPYRIGHT: BIOL ABS. As(III), As(V) and organic arsenic in water was determined by differential pulse polarography. As(III) is directly determined in 2 M HCl as supporting electrolyte. Total inorganic arsenic (As(III)+ As(V)) is measured after reduction of electro-inactive As(V) with sodium sulfite. Total As is determined after oxidative treatment of the water residue with potassium permangnate and magnesium nitrate, and reduction of As with sodium sulfite. Organic As is evaluated by difference. The efficiency of the whole procedure is 78-80% and its detection limit is 1 mug/l. The relative SD is better than | 1.5% at 50 mug/l. Interferences due to heavy metals are overcome by removing them by anion-exchange or pre-electrolysis with a Hg cathode.