Employ potassium borohydride as reducer,reduce mercuric ion in liquor to Hg vapour,the Hg vapour is carried to at-omization device by Ar gas,determined by cold-atomic fluorescence.

• 用硼氢化钾作还原剂,将溶液中汞离子还原成汞的蒸气原子,用载气导入原子化器中,直接用冷原子荧光光谱法测定水样中痕量汞。