流动注射-氢化物发生-原子吸收光谱法测定水中的微量砷

Trace Arsenic Determination in Water by FI-HG-AAS

优化了测定水中微量砷的流动注射一氢化物发生一原子吸收光谱法：当水样中HC浓度为10％时，用1％碘化钾-1％抗坏血酸进行预还原，再用0．5％KBH。一0．125％NaOH溶液为还原剂，分别以1％HEl溶液及氨气为载液及载气（流速50mL／min），该方法测砷的灵敏度为0．16μg／L，检出限为0．066μg／L，最低检测浓度为0．48μg／L，相对误差3．8％，相对标准偏差1．12％，回收率在100．9％-106．2％，具有分析简便、准确、快速、干扰少的特点。

The determination method of trace arsenic in water with FI - HG - AAS （ flow injection hydride gen- eration atom absorption spectrometry） is optimized in this study. In water sample, when HC1 concentration is 10% prereducing agent is 1% KI - 1% ascrobic acid. In the flow injection system, when the reducing agent is 0. 5% KBH4 -0. 125% NaOH, the carrier solution is 1% HC1 and the carrier argon gas speed is 50 mL/min. This method is convenient, accurate, fast and antiinterference, with sensitivity of 0. 16 μg/L, detection limit 0. 066 μg/L. The minimum detectable concentration of the method is 0. 48 μg/L, with relative error 3.8%, RSD 1.12%, and recovery ratio 100. 9% - 106. 2%.