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在韦耳奇尔(F.J.WeIcher)的“乙二胺四乙酸在分析化学中的应用”一书中,关于钙和磷同时存在时应用EDTA 的快速滴定法,总结了沉淀分离及离子交换分离等方法。由于我们在生产上经常需要同时测定这二个元素的量,因此对其分析测定,在操作上作一些改进,以达到快速准确的目的。当磷存在时测定钙,柯里尔(R.E.Collier)在70毫升溶液中钙含量高达0.1克,而磷与钙之比为30∶1时用紫尿酸铵及铬黑T 为指示剂以标准EDTA 直接滴定钙并不引起可觉察的干扰。作者根据柯里尔所述的方法做了一些实验,当磷与钙的克分子比小于0.5时可以按照一般的方法进行钙的直接滴定。随着磷与
In FJWecher’s “The Application of Ethylenediaminetetraacetic Acid in Analytical Chemistry,” titrimetric methodologies for the simultaneous presence of calcium and phosphorus using EDTA are summarized in Precipitation Separation and Ion Exchange Separation method. Because we often need to measure the amount of these two elements in the production at the same time, we have made some improvements in the analysis and determination to achieve fast and accurate purposes. Calcium was measured in the presence of phosphorus, and RECollier contained up to 0.1 g of calcium in 70 ml of solution. When the ratio of phosphorus to calcium was 30: 1, ammonium violet and chrome black T were used as the indicator to standard EDTA Direct titration of calcium does not cause appreciable interference. The author did some experiments according to the method described by Corriel. When the molar ratio of phosphorus to calcium is less than 0.5, the titration of calcium can be carried out according to a general method. With phosphorus and