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大约十五年前Schwarzenbach教授发表了用乙二胺四乙酸(EDTA)络合滴定钙和镁。当时他提出两种络合滴定指示剂。现在我们称它为经典的络合滴定指示剂。十五年来这方面的工作发展得很快,如今大多数元素都能用很简单又方便的方法进行测定。EDTA选择性不强,能与三十多种元素组成络合物,是最广泛使用的络合滴定剂。在日常的分析工作中,人们常遇到各种复杂成分的矿石或合金样品,如何在同一溶液中测定若干种元素就成为很重要的问题,要解决这问题通常用下列几种办法:
About fifteen years ago, Professor Schwarzenbach published a complex titration of calcium and magnesium with ethylenediaminetetraacetic acid (EDTA). At that time, he proposed two complexometric titration indicators. Now we call it a classic complexometric titration indicator. Fifteen years have seen a rapid development in this area, and most elements can now be measured in a very simple and convenient way. EDTA selectivity is not strong, with more than 30 kinds of elements complex, is the most widely used complexing titrant. In routine analysis, people often encounter various complex composition of ore or alloy samples, how to determine a number of elements in the same solution has become a very important issue, to solve this problem are usually used in the following ways: