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Indicator for complexometric titration of Mg, Ca, Sr and Ba. It is used as an alkaline earth metal ion indicator. Suggested to be colorless at pH 11, but turns pink in the presence of alkaline earth metals. Also utilized in an auto analyzer to determine serum calcium.
J. Stern; W.H.P. Lewis. The colorimetric estimation of calcium in serum with o-cresolphthalein complexone. Clinica Chimica Acta. 1957, 2, (6), 576-580.
F. H. Pollard and J. V. Martin. The spectrophotometric determination of the alkaline-earth metals with murexide, eriochrome black T and with o-cresolphthalein complexone. Analyst. 1956, 81, (963), 348-353.
Indicator for complexometric titration of Mg, Ca, Sr and Ba: Helv. Chim. Acta, 72, 113 (1954).