电化学氢化物发生-微量吸收池分光光度法测定金银花中不同价态砷的应用研究  

Electrochemical Hydride Generation-micro Absorption Spectrophotometric Determination of Inorganic Arsenic of Different Valency State

作　　者：郑琰[1] 张玉欣[1] 刘月[1] 夏雪文[1] 孟庆华[1] 

机构地区：[1]江苏师范大学化学化工学院,江苏徐州221116

出　　处：《信息记录材料》2016年第1期20-25,共6页Information Recording Materials

摘　　要：本文利用自行设计制作的一个电解装置,建立了一个将样品于硫酸介质中生成砷化氢气体的反应系统,用硝酸银-聚乙烯醇-无水乙醇混合液作吸收显色剂的微量砷的分光光度法(简称新银盐法)并通过流动注射定量反应,不同价态的无机砷在铅电极上具有较高的电化学氢化物发生效率,同时又存在较为明显的差异。通过选择不同的电流条件,采用电化学氢化物发生与微量吸收池分光光度法联用技术有效地实现了无机砷的形态分析。By using a self-designed production of electrolytic devices, The establishment of a sulfuric acid in the samples will be generated in the reaction of hydrogen arsenide, and the mixture of silver nitrate, polyvinyl alcohol, ethanol as fluid absorption. The spectrophotometry which measure trace arsenic is also named new silver method. And it quantitative through the flow-injection reaction. High rates of Electrochemical hydride generation（EC-HG） of Inorganic arsenic in tri- and penta- valent state were obtained at the glassy carbon cathode in the electrolytic cell. Differences in sensitivity and in slopes of calibration curves for As（ III） and As（ V ） were also observed. Based on these facts and by selecting different conditions of electrolytic currents at 0.SA and 1.0A, EC-HG was hyphenated with spectrophotometry of microcuvette for the speciation analysis of inorganic arsenic.

关 键 词：电解装置 电化学氢化物发生 微量吸收池分光光度法 无机砷(III V) 金银花 流动注射 

分 类 号：TQ15[化学工程—电化学工业]