Abstract
A simple spectrophotometric method for the determination of low concentrations of sulphate using Sulphonazo III reagent is described. The method involves precipitation of barium sulphate and formation of a blue complex between unreacted barium and Sulphonazo III. The absorbance is inversely proportional to sulphate content and the working range for the method is from 3 to 30 µg (as SO42–) per 5 ml of sample (0.6 × 10–5 to 6 × 10–5M). For standard sulphate solutions (0.6–6 µg ml–1) the standard deviation is less than 0.1 µg ml–1. The procedure is intended mainly for the determination of sulphur dioxide in ambient air after absorption in dilute hydrogen peroxide.
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