Detennination of trace uranium in environment by laser induced fluorescence method

he analytical technique of trace uranium has been developed rapidly since Robbins firstreported the laser uranium analyzer in 1978. Because of the complicated operation and experimentalprocedure of the normal spectrophotometer, neutron activation and solid fluorescence, they havebeen replaced gradually by the laser induced fluoresccncc mcthod. According to high sensitivity andIow detection limit of the fluoreseenee, it can determine the trace uranium. The uranium content inthe lake water, underground water and rain etc. can be measured directly without pretreatment. Therange of the method for determining uranium is from 005 ppb to 20 ppb, and the detection limitis 0.05 ppb.

江浙沪地区主要天然水源中铀含量水平的调查

对江苏、浙江、上海地区主要天然水源中铀的含量水平,尤其对上海城乡居民饮用水、地面水和地下水进行了连续5年的监测研究,比较了不同水源中铀的含量及其分布。共设采样点25个。由于水源性质不同,铀含量亦有明显差异,在0.07—0.72μg/l 范围内变化,但均不超过我国水源正常本底值范围。