A method for determination of arsenic species in environmental samples have been studied (water and sediment of Nhatrang onshore). The analytical method used was ion-exchange liquid chromatography coupled on-line to atomic absorption pectrometry through hydride generation. It was applied to determination of As species in H3PO4+ extracts of sediments. The efficiency of this extraction procedure was studied in details. The sensibility of this investigated method allows both the analysis of As-poor samples and the dilution extracts, of As-rich ones. The efficiency of orthophosphoric acid and hydroxylamine hydrochloride extraction mixture is 89% with extraction time 60 min. On the whole, the method proposed has a good potential as a routine speciation analysis procedure for As speciation studies in environmental solids.
