In this paper HNO3-HClO4 was used to digeste the sample, thiourea and chloric acid were added to reduce the sample in hydrochloric acid solution, and arsenic in the pretreated sample was analyzed using hydride-atomic absorption spectrometry. The method had been applied to the city rubbish infiltration wastewater in the sewage storage site of Lanzhou. The recoveries were 98. 3% ~104%, the relative standard deviation were 1. 2% ~3. 2%, and the detection limit of method was 0. 35 μg/L, the Linear regression equation was: IF=15. 962 × C+0. 423 and the correlation coefficient was 0. 999 8. It is confirmed by testing that the method is simple, rapid, accurate and reliable, and has a wide measurable range, it is an effective detection method for the directly determination of urban sewage, and is able to provide a scientific basis for the evaluation of garbage storage site of Lanzhou city on the degree of impact of the environment and the governance.%采用硝酸-高氯酸消解,在盐酸介质中加入硫脲、抗坏血酸还原.应用氢化物发生-原子荧光光谱法对兰州市城区垃圾存储场地下渗透污水中的砷进行了测定.其方法回收率在98.3%~104%之间,相对标准偏差在1.2%~3.2%之间,方法检出限为0.35μg/L,线性回归方程为：IF=15.962×C+0.423,相关系数为0.9998.经试验证实,方法简便快速、准确可靠、可测范围宽,是一种直接测定城市污水的有效检测方法.为兰州市城区垃圾存储场地对环境的影响程度、评估治理提供了科学依据.
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