Spectrophotometric determination of traces of antimony.
Antimony(III) is extracted into carbon tetrachloride from 4M sulphuric acid that is 0.05M in potassium iodide. 8-Mercaptoquinoline and acetone are added to the organic extract and the absorbance of the complex formed is measured at 390 nm. Repeating the extraction procedure greatly increases the selectivity of the method.
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Laboratory of Analytical Chemistry J. Heyrovský Polarographic Institute Czechoslovak Academy of Science Praha 1, Jilská 16, Czechoslovakia.