The indicators sulphaonazo III, dimethylsulphonazo III and carboxyarsenazo have been compared for the determination of sulphur by flask combustion or by furnace-tube combustion. Carboxyarsenazo is preferred, the optimum conditions for its use being a 2 + 1 acetone-water solution buffered with pyridine and perchloric acid.
E. E. Archer, D. C. White and R. Mackison, Analyst, 1971, 96, 879 DOI: 10.1039/AN9719600879
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