介绍了一种用氢化物发生原子荧光法测定水中砷和汞的方法.此法是在盐酸介质中,以硼氢化钾为还原剂,将被测元素转化为挥发性氢化物,以高纯氩气为载气将挥发性氢化物从母液中分离,并导入原子荧光光度计进行检测.采用AFS-830a型原子荧光光度计同时测定瓯江流域水中砷、汞的含量.该方法的最低检出限:砷为0.0814 μg·L-1,汞为0.0235 μg·L-1;RSD(n=8)As 1.7%~4.9%,Hg 2.4%~6.8%. A method for the determination of arsenic and mercury in water by hydride generation atomic fluorescence spectrometry is introduced, which is that the element to be measured is converted into a volatile hydride by using potassium borohydride as a reducing agent in a hydrochloric acid medium, Gas as the carrier gas to separate the volatile hydride from the mother liquor and lead to the atomic fluorescence spectrometer for the detection.AFS-830a atomic fluorescence spectrophotometer was used to determine the contents of arsenic and mercury in the water of the Oujiang River at the same time.The lowest detection limit The limits are as follows: arsenic 0.0814 μg · L-1, mercury 0.0235 μg · L-1; RSD (n = 8) As 1.7% -4.9%, Hg 2.4% -6.8%.