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当离子强度调节剂为０．１ｍｏｌ·Ｌ－１ＫＣｌ，溶液ｐＨ值为５时，在２．５ｍｌ０．０２ｍｏｌ·Ｌ－１的磺基水杨酸存在下，测定Ｃａ２＋离子的最低浓度为１．０×１０－５ｍｏｌ·Ｌ－１．该法适用于食品中钙的测定，与ＥＤＴＡ络合滴定法结果相吻合．测定的相对平均偏差为４％．
When the ionic strength regulator is 0.1 mol·L-1 KCl and the pH value of the solution is 5, the lowest concentration of Ca2 + ions in the presence of 2.5 ml 0.02 mol·L-1 sulfosalicylic acid is 1.0 × 10-5mol·L-1. The method is suitable for the determination of calcium in food, which is in good agreement with the results of EDTA complexometric titration. The relative average deviation measured was 4%.