单阀FIA氢化物发生分光光度法测定水中砷的研究

利用自行设计制造的新型氢化物发生及吸收装置，将流动注射技术同氢化物发生分光光度法有机地结合在一起。设计了一种单阀ＦＩＡ氢化物发生分光光度测砷的流路系统，该系统不南非载气，选用ＡｇＮＯ３－ＨＮＯ３－聚乙烯醇－乙醇混合液作为吸收液及ＫＢＨ４溶液作生反应。瘫针该方法用各种水中痕量砷的测定，具有简便，快速（３０次／ｈ）、灵敏度高，重现性好（Ｒ．Ｓ．Ｄ＝３．０４５）、检出限低（ｃＬ＝１．８２×１０＾－９ｇ／

^Study on the Determination of Arsenic in Wastewater by Using Single Valve FIA combined with Hydride Generation Spectrophotometry

A Single Valve FIA (Flow Injection Analysis) system with hydeide generation spectrophotometric detection was designed for the determination of the trace arsenic in wastewater. This FIA system had no need for any carrying gas. The new hydride generator and the absorbing device made by the authors were used in the FIA system. The KBH₄ solution and the mixed silver nitrate-polyvinyl alcoholethanol solution were used for the generation and absorption, respectively, of arsenic hydride. The experimental results show that this method was very good for the determination of trace arsenic in wastewater. The FIA system had main advantages,including simple equipment, easy operation, high sensitivity, rapid determination (30 samples/h),good reproducibility (R. S. D =3.04%) and low detection limit (1.82×10^-9g/ml).