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Sulfonazo III salt is used as spectrophotometric reagent for alkaline earth metals and indicator for sulfate titrations. In general it is used as an indicator.
Paul J. Kemp; Max B. Williams. Simultaneous spectrophotometric determination of barium and strontium using Sulfonazo III. Anal. Chem.1973, 45, (1) 124-129.
Indicator for determination of sulfates and sulfur: Anal. Chem., 37, 1159 (1965). Spectrophotometric reagent for alkaline earth metals.