FIELD: chemistry.
SUBSTANCE: method involves measuring emf of the analysed sample, which is brought to pH 5 with hydrochloric acid with addition of calcium chloride solution with concentration of 1 mol/l in ratio of 5:1, using a silver chloride electrode and a calcium selective electrode, and then finding concentration of calcium using a calibration curve. The method enables to determine content of calcium in the range of 0.004-4 g/l.
EFFECT: method enables to conduct analysis without preliminary sample preparation, without spending time on titration, without using indicators and without spending on expensive equipment.
1 tbl, 5 ex
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