Coprecipitation of Arsenic (V), (III) and Antimony (III) on lron (III) and Aluminium Hydroxides

Abstract

Coprecipitation behaviors of As(III), (V)and Sb(III)ions onto Fe(III)or aluminium hydroxide in both buffer solutions and sea water have been. studied. lt was found that As(V)and Sb(III)ions are quantitatively. coprecipitated on Fe(III)hydroxide from pH 6 to 9, and As(III)from pH 7 to 9. Coprecipitation Qnto aluminium hydroxide was quantitative for As(V)in the pH range from 5 to 9 b qt not for As(III) In sea water, almost he same behaviors in the buffer solution were obgerved for these three ions, except the fact that the coprecipitation of As(III), (V)became quantitative in the alkalione so1ution( pH 10)where the coprecipitation onto Mg hydrQxide took place. As a conclusion, these three ions tend to be removed into the sediment in the, hyd, rosp. here by the, coprecipitation process.