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  • Title: Arsenazo III as metallochromic indicator for complexometric determination of calcium in slightly alkaline medium.
    Author: Michaylova V, Kouleva N.
    Journal: Talanta; 1973 May; 20(5):453-8. PubMed ID: 18961304.
    Abstract:
    Arsenazo III is proposed as metallochromic indicator for calcium in slightly alkaline medium. The visual titration with EDTA was performed at pH 8 and 40 microg-12 mg of calcium were determined. The interference of some ions was considered and it was found that phosphate does not interfere appreciably. Spectrophotometric detection of the end-point was used for titration of calcium in the presence of magnesium at pH 9. For the estimation of the titration error, the conditional stability constants of the calcium-arsenazo III complex were found.
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