calmagite

calmagite

[′kal·mə‚jīt]
(organic chemistry)
C17H14N2O5S A compound crystallizing from acetone as red crystals that are soluble in water; used as an indicator in the titration of calcium or magnesium with EDTA.
References in periodicals archive ?
Using a DR 3800 Spectrophotometer (Hach, Loveland, Colorado), we measured calcium carbonate using the calmagite colorimetric method 8030, nitrate-nitrogen using the dimethyl-phenol method 10206, potassium using the ammonium acetate method, and phosphorus using the ascorbic acid method 10209-10210 of Jones (2001).