Simultaneous determination of chloride, nitrate and sulphate in vegetable samples by single-column ion chromatography

Abstract

A new ion chromatography method is described for the simultaneous determination of Cl −, NO 3 − and SO 4 2−, using a selected eluent 1.3-mM sodium gluconate/1.3-mM borax (pH 8.5). The extraction methods of Cl −, NO 3 −, SO 4 2− in vegetables are studied. The determination limits of Cl −, NO 3 −, SO 4 2− are 0.17 μg/ml, 0.63 μg/ml and 0.81 μg/ml. The linear ranges are 0∼60 μg/ml, 0∼90 μg/ml and 0∼90 μg/ml. The relative S.D. are <2.5%. The mean recoveries of Cl −, NO 3 −, SO 4 2− in vegetables range from 97.0 to 104%.