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本文研究了用乙二醛双缩（２－羟基苯胺）［简称ＧＢＨＡ］和铬黑Ｔ［简称ＥＢＴ］双指示剂、ＥＤＴＡ容量法连续滴定水中Ｃａ２＋和Ｍｇ２＋的方法和滴定条件。试样分析和对照试验结果表明：本法的分析结果准确可靠，且与目前广泛采用的用钙指示剂和铬黑Ｔ为指示剂、ＥＤＴＡ容量法滴定水中Ｃａ２＋和Ｍｇ２＋的方法相比，简化了测定手续，结果计算更直接，可用于水中Ｃａ２＋和Ｍｇ２＋含量的快速测定
In this paper, the titration conditions and titration conditions of continuous titration of Ca2 + and Mg2 + in water by EDTA volumetric method with glyoxal double-reduced (2-hydroxyaniline) [abbreviation GBHA] and chrome black T [referred to as EBT] The results of sample analysis and control experiment show that the analysis result of this method is accurate and reliable. Compared with the widely used method of titration of Ca2 + and Mg2 + in water with calcium indicator and chrome black T as indicator and EDTA volumetric method, Determination procedures, the results calculated more direct, can be used for rapid determination of Ca2 + and Mg2 + in water