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本文提出将溶出伏安法和极谱催化法结合起来,用溶出催化波来测定微量硒;考察了各种试验条件及其它离子对分析结果的影响,并对实样进行了分析测定。用国产883型笔录式极谱仪,配用旋转玻碳电极测定硒,电解富集3—5分钟,可定量测定浓度在4×10~(-9)—1×10~(-7)M范围内的硒;富集20—30分钟,硒的检出下限为7×10~(-10)M。测定时不必除氧。在测定硒的基础上,用玻碳电极和大汞电极相配合,对硒的溶出催化电极过程进行了研究,探讨了此过程中各步反应的机理。
In this paper, the combination of stripping voltammetry and polarographic catalysis was proposed to determine the trace selenium by the catalytic dissolution wave. The influences of various test conditions and other ion pairs on the analytical results were investigated. The samples were analyzed and determined. The concentration of selenium was determined by using a domestic 883 record-type polarography instrument equipped with a rotating glassy carbon electrode for 3-5 minutes. The concentration of the selenium can be quantitatively determined from 4 × 10 -9 to -1 × 10 -7 M Range of selenium; 20-30 minutes enrichment, selenium detection limit of 7 × 10 ~ (-10) M. Do not need to test oxygen. Based on the determination of selenium, the process of dissolution of selenium catalyzed electrode was studied by using glassy carbon electrode and large mercury electrode, and the reaction mechanism of each step in this process was discussed.