铀在自然界是一种稀有的放射性元素,天然水中铀含量一般都较低(10~(-9)～10~(-6)g/L之间)。采用《水质分析大全》推荐的荧光法(灵敏度10~(-9)～10~(-10)g/L)作铀含量测定,操作较繁杂,且不易掌握。我们通过试验,改用萃取比色法替代荧光法。此法操作简便、快速,且能在现场直接测定,现介绍如下: 1 实验方法 1.1 原理 钽试剂能与铀生成不溶于水而能溶于有机溶剂的沉淀物。在pH=6左右时,用钽试剂的 Uranium is a rare radioactive element in nature. The content of uranium in natural water is generally low (between 10 ~ (-9) ~ 10 ~ (-6) g / L). Fluorescence method (Sensitivity 10 ~ (-9) ~ 10 ~ (-10) g / L) recommended by the “Water Quality Analysis Daquan” is used for the determination of uranium content. The operation is complicated and not easy to grasp. We passed the test, instead of using colorimetric extraction method instead of fluorescence. This method is simple, fast, and can be directly measured in the field, are described below: 1 Experimental Method 1.1 Principle Tantalum reagent with uranium can generate insoluble in water and soluble in organic solvents precipitate. At pH = 6 or so, use tantalum reagents