Indirect atomic-absorption determination of ppM levels of arsenic by combustion of an MIBK extract of arsenomolybdic acid.
An indirect atomic-absorption method for arsenic has been developed. Arsenic(III) is oxidized to arsenic(V) by iodine, then arsenomolybdic acid is formed and extracted into MIBK from 0.2-1.6M hydrochloric acid. Excess of molybdate is scrubbed from the organic phase, and then the molybdenum in the heteropoly acid is determined by its atomic absorption at 313.3 nm. Silicate and phosphate interfere. A procedure is described for determination of ppM levels of arsenic in water.
Yamamoto
Y
Y
Department of Chemistry, Faculty of Science, Hiroshima University, Higashisenda, Hiroshima, Japan.
Kumamaru
T
T
Hayashi
Y
Y
Kanke
M
M
Matsui
A
A