A determination method of inorganic arsemc in coal was established by sequence injection hydride generation-atomic fluorescence spectrometry ( HG-AFS) , after the ultrasonic extraction with 6 mol/L HCl as extraction reagent. The ultrasonic extraction conditions were optimized, including extraction reagent, time and temperature. Under the optimized experimental condition, arsemc in concentration range of 0. 20-100 μg/L showed linearity to the fluorescence intensity with correlation coefficient of 0. 999 7. The detection limit of arsenic was 0. 025 μg/L. The relative standard deviation (RSD) for 10 μg/L As was 0. 9 ％ (n=11). The proposed method has been applied to the analysis of coal fly ash component analysis certified reference material (GBW08401) and coal samples with recoveries of 95％-102 ％, and the result of GBW08401 was consist with the certified value.%利用6 mol/L盐酸作为提取试剂,样品经超声提取后,用顺序注射氢化物发生-原子荧光光谱法测定煤中无机砷的含量.对超声提取条件(提取试剂浓度、时间、温度)进行了优化.在优化的实验条件下,砷的浓度在0.20～100μg/L范围内与荧光强度呈线性关系,相关系数为0.999 7,砷的检出限为0.025μg/L,对10 μg/L砷标准溶液进行重复11次测量,得出相对标准偏差(RSD)为0.9%.用该法对煤飞灰成分分析标准物质GBW08401和煤样进行分析,测得回收率在95%～102%之间,标准样品的测定值和认定值相符.
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