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. 1973 May;20(5):453-8.
doi: 10.1016/0039-9140(73)80182-1.

Arsenazo III as metallochromic indicator for complexometric determination of calcium in slightly alkaline medium

V Michaylova  1 , N Kouleva
Affiliations

Arsenazo III as metallochromic indicator for complexometric determination of calcium in slightly alkaline medium

V Michaylova et al. Talanta. 1973 May.

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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