Abstract
A sensitive and reliable method for the determination of barium in aqueous systems has been developed. The combination of the solvent extraction of the barium hexafluoroacetylacetonate into isoamyl acetate with subsequent determination by atomic absorption has increased by 50%, the best sensitivity previously attained. The proposed method presents a simple, rapid method of determining barium at concentrations as low as 0.015 μg ml −1 with an ultimate sensitivity of 0.005 μg ml −1 for 1 % absorbance. The use of a high concentration of potassium ion in the aqueous system improves the sensitivity. The potassium is coextracted with the barium and acts to suppress the ionization and enhance the absorption of barium. Interference effects of 55 diverse ions were studied and their tolerance levels are summarized. No significant interferences were found.
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