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Simplified photometric determination of Calcium in serum without deproteinisation A simplified method for the determination of Calcium in serum without protein precipitation is described. The calcium values are obtained from the difference in optical density of the Glyoxal-bis(2-hydroxyanil) colour complex before and after the addition of EDTA. Precision and accuracy of the method are excellent.

Vereinfachte photometrische Calciumbestimmung im Serum ohne Eiweißfällung