The sequential injection system with adsorptive stripping voltammetric detection

被引:23
作者
Kubiak, WW
Latonen, RM
Ivaska, A
机构
[1] Abo Akad Univ, Analyt Chem Lab, Proc Chem Grp, FIN-20500 Turku, Finland
[2] Stanislaw Staszic Univ Min & Met, Fac Mat Sci & Ceram, PL-30059 Krakow, Poland
关键词
adsorptive stripping voltammetry; sequential injection analysis; heavy metal ions; riboflavin;
D O I
10.1016/S0039-9140(00)00614-7
中图分类号
O65 [分析化学];
学科分类号
070302 ; 081704 ;
摘要
Two sequential injection systems have been developed for adsorptive stripping voltammetric measurement. One is for substances adsorbing at mercury, e.g. riboflavin. In this case, a simple arrangement with only sample aspiration is needed. Reproducibility was 3% and detection limit 0.07 muM. The measuring system was applied to determination of riboflavin in vitamin pills and to study the photodegradation process of riboflavin in aqueous solutions. In the second case, metal ions were determined. They have to be complexed before deposition on the mercury surface. Thus, both the sample and the ligand have to be aspirated in the system. In this case, the reproducibility was approximate to 6% and the detection limit < 0.1 ppm for cadmium, lead and copper when complexation with oxine was used. Dimethylglyoxime was used in determination of nickel and cobalt and nioxime complexes were used in determination of nickel and copper. With these complexing agents, the reproducibility was the same as with oxine, but the metals could be determined at concentrations lower than 0.01 ppm. Application of two ligands in a SIA system with AdSV detection was also studied. Simultaneous determination of copper, lead, cadmium and cobalt was possible by using oxine and dimethylglyoxime. Copper and nickel were simultaneously determined by using dimethylglyoxime and nioxime. <(c)> 2001 Elsevier Science B.V. All rights reserved.
引用
收藏
页码:1211 / 1219
页数:9
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