STUDY ON THE EFFECTS OF SOME MAJOR IONS TO THE ANALYZING OF AS (III) IN GROUNDWATER BY MEANS OF CAPILLARY ELECTROPHORESIS USING CONTACTLESS CONDUCTIVITY DETECTOR WITH ELECTROKINETIC INJECTION AND THE SOLUTIONS

Abstract

      During sample preparation, 1,10-Phenanthroline is added to complex with iron in order to eliminate the coprecipitation process which may reduce arsenic concentration. After complexation with iron, the sample is washed through strong acid cation exchange column and futher aerated by nitrogen to remove bicarbonate. The peak height of 100 g/L of As (III) will reduce more than 30% with the presence of anion Cl-, NO2-, SO42-, PO43-at concentrations higher than 5 mg/ L, so the additional standard methods should be taken for analyzing groundwater samples.