APPLICATION OF A CHELATING RESIN LOADED WITH THIONALIDE TO SPECIATIONANALYSIS OF AS(III,V) IN NATURAL-WATERS

Thionalide loaded acrylic resin (Bio Beads SM-7) was used for separati on of As(III) from As(V) and their preconcentration from natural water s. At pH 8.0 As(III) was retained on the column bed while As(V) passed to the effluent. As(V), after reduction to As(III), was then retained on another column from 4 mol l(-1) hydrochloric acid solution. The re tained arsenic was eluted with concentrated nitric acid and determined by GF AAS. As(III) and As(V) were determined in samples of river, wel l and mine waters.