Indirect determination of micrograms of sulfate by barium absorption spectroscopy

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Abstract
The indirect procedure for sulfate determination by Ba absorption spectroscopy was modified so that low concentrations of SO4 in small volumes of solutions could be determined rapidly and precisely. Major modifications consisted of seeding the sample with BaSO4, precipitating in ethanol solutions to lower BaSO4 solubility, and determining Ba in a N2O‐acetylene flame using the absorption mode. The results showed: complete SO4 precipitation as BaSO4 after 15 min of shaking, little or no effect from solution Al on SO4 determination, quantitative recovery of SO4 from 0.01 M Ca(H2PO4)2 soil extracts, and greater precision of SO4 measurement with indirect method than with turbidimetric method.