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试样以硝酸、氢氟酸溶解,高氯酸冒烟,定容。取部分溶液,在pH≥12.5碱性介质中,以钙试剂为指示剂,用EDTA标准溶液滴定钙量。
Sample to nitric acid, hydrofluoric acid dissolved, perchloric acid smoke, constant volume. Take part of the solution, pH ≥ 12.5 in alkaline medium, with calcium reagent as indicator, titration with calcium EDTA standard solution.