First Batch of Topics of “Key Technical Standard Promotion Project” tarted,270 Important National Standards or Professional Standards Will Be Prepared

At the first working meeting of the 'Key Technical Standard Promotion Project', an important project of the national scientific and technical support plan during the '11th Five Year' held recently in Beijing, the first group of 11 research topics for the 'Key Technical Standard Promotion Project' was formally introduced.……

高镁低钙样品中钙镁的直接配位滴定研究

本文研究了以酒石酸盐（Ｔａｒｔ）——三乙醇胺（ＴＥＡ）——乙酰丙酮（ＨＡＡ）为联合掩蔽剂，用偶氮氯膦Ⅲ（ＣＰＡⅢ）为指示剂，在ｐＨ１０用乙二醇二乙醚二胺四乙酸（ＥＧＴＡ）选择性滴定钙，允许样品中ＣａＯ和ＭｇＯ比例至少为１∶１００，成功地解决了大量镁存在下钙镁的直接配位滴定问题。本法用于菱镁矿样品中钙镁的测定，回收率为９８％～１０１％。