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

摘要

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 obrax(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 #mu#g/ml,0.63 #mu#g/ml and 0.81 #mu#g/ml.The linear ranges are 0approx60 #mu#g/ml and 0approx90 #mu#g/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%.