Rapid ion chromatographic separation and determination of arsenic(III)-arsenic(V) and molybdenum(VI)-chromium(VI)

Abstract

A flow coulometric detector was used to study the separation of two pairs of inorganic anions by ion chromatography using sodium nitrate as eluent. The separations of As^III-As^V and Mo^VI-Cr^VI were carried out within 11 and 22 min, respectively. The separation conditions for As^III and As^V were 0.17 M sodium nitrate as eluent with a flow-rate of 1.0 ml min^–1 and those for Mo^VI and Cr^VI were 0.3 M sodium nitrate as eluent with a flow-rate of 1.2 ml min^–1.