Abstract
Solutions of dioctylarsinic acid (DOAA), (n-C8H17)2AsOOH, in chloroform have been equilibrated with aqueous solutions of perchloric, hydrochloric, hydrobromic, nitric, sulfuric and hydriodic acids. The loading experiments with perchloric acid indicate that 0·1 M DOAA, after equilibration with HClO4 of initial concentration 5M–9M, forms a dimeric specie (DOAA·HClO4)2. Except for sulfuric and hydriodic acids, the loading curves for the other mineral acids are similar to the curve for HClO4 with well defined plateaus at equimolar ratios of [H+]0[DOAA]0 in the range of initial aqueous acid concentration from about 3M–7M. Reagent dependence studies showed that the mineral acids formed 2:1 adducts with DOAA at 0·1 M aqueous acid concentrations. Sulfuric acid was not extracted at this concentration, but formed a mixture of 2:1 and 2:1 adducts between 0·5 M and 1·0 M aqueous acid. Hydriodic acid reacted with DOAA. Water was coextracted with all mineral acids and the concentration of water in the organic phase decreased at aqueous acid concentrations greater than 6 M.
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