天然降水和径流水中四种微量元素的测定

水样中微量元素的测量是研究元素迁移的一项基础工作。通常用火争原子吸收和法测定水样中微量元素，当样品中元素含量较低时需用甲基异丁基甲酮萃取后测定。该文对这一方法进行了改进，采用浓缩水样以提高街测元素的含量，并加入二氯化钙作为释放剂来消除硅的干扰。

Measurement of Four Trace Elements in Natural Rainfall and Runoff

The measurement of trace elements in water samples is a fundamental laboratory work for element transport in both soil and runoff.It is usually done by using a flame atomic absor ption spectrophotometer.Howerer,an extraction procedure by adding methyl butyl ketone(MIBK, for short) is necessary when the element concentration in the samples is very low.An improvement on the method is made by using concentrated water sample in order to increase the concentration of trace elements in the samples.The interfering problem of silicone on the concentration is solved by adding calcium chloride.The results show that the improved method is simple,and both the recovery rate of the samples and the accuracy of the method are satisfactory.