激光荧光法测定环境介质中微量铀

Determination of Uranium in Environmental Samples Using Laser-Fluoreeence

自然环境中存在天然放射性核素铀及其子体,它的含量一般在ppm水平,过去常用于微量铀的分析方法有分光光度法,固体荧光和中子活化法,这些方法由于灵敏度低和实验条件繁杂给分析带来一定困难。

A method for determining trace uranium in natural water, soil and plant samples is reported by using laser induced fluorecence. Fluorescence of uranium is produced due to excitation by a small nitrogen laser, and the method is simple in operation and rapid in measurement.Natural water, including sea water, river water, lake-water, ground water etc. can be measured directly without preconcentration, solid and plant samples must be trans -formed into solution and then be measured. Concentra tion of nranlum is determined in the range from 0.05 to 20 ppb with the detection limit of uranium in 0.05 pphand the accuracy of ± 15%.