利用全自动石墨消解仪，以50%王水消解样品，在5%盐酸介质中用0.8%硼氢化钾（含0.2%的氢氧化钾）作为还原剂，采用氢化物发生-原子荧光光度法（HG-AFS）对地球化学样品中的砷、汞2种元素同时进行测定。结果表明，该方法砷和汞的检出限分别为0.006 8、0.004 3 μg/g，砷和汞的相对标准偏差（RSD%，n=12）分别为0.43%~4.05%、2.98%~7.88%，均小于10%。该方法结果准确，操作简便、快速，应用成本低，精密度和准确度均满足地质实验室质量管理规范要求（DZ/T 0130—2006），可广泛应用到测定地质样品中砷、汞的实际工作中。

The samples are digested with 50% aqua regia in a fully automatic graphite digestion meter.Arsenic and mercury in geochemical samples are simultaneously determined by hydride generation-atomic fluorescence spectrometry (HG-AFS) method using 0.8% potassium borohydride (containing 0.2% potassium hydroxide) in 5% hydrochloric acid medium as a reductant.Determination results show that the detection limits for arsenic and mercury by this method are 0.006 8 μg·g^-1 and 0.004 3 μg·g^-1,respectively,and the relative standard deviations (RSD%,n=12) for arsenic and mercury are 0.43%-4.05% and 2.98%-7.88%,respectively,both less than 10%.This method can offer accurate results,and is easy to operate rapidly at a low application cost,with precision and accuracy meeting the requirements of China's quality management standard of geological laboratory (DZ/T 0130—2006).It can be widely used in the actual determination of arsenic and mercury in geological samples.