UNUSUALLY STRONG ADSORPTION OF HIGHLY-CHARGED HETEROPOLYTUNGSTATE ANIONS ON MERCURY-ELECTRODE SURFACES

被引:72
作者
RONG, CY [1 ]
ANSON, FC [1 ]
机构
[1] CALTECH,ARTHUR AMOS NOYES LAB CHEM PHYS,DIV CHEM & CHEM ENGN,PASADENA,CA 91125
关键词
D O I
10.1021/ac00091a021
中图分类号
O65 [分析化学];
学科分类号
070302 ; 081704 ;
摘要
The adsorption of multiply charged, heteropolytungstate anions on mercury electrodes is extraordinarily strong. For the chromium(III)-substituted anion, alpha(2)-[P2W17O61Cr(OH2)](7-), the mercury surface is half-saturated at concentration of the heteropolyanion of only 5 X 10(-9) M. In the presence of the adsorbed anions, the rate of reduction of the unadsorbed heteropolytungstates in solution is greatly diminished. The decreased reduction rates appear to result from increases in the negative diffuse layer potentials produced by the anion adsorption. The spontaneous adsorption of heteropolytungstates on mercury may prove useful in their electroanalysis at very low levels and in electrocatalytic applications.
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页码:3124 / 3130
页数:7
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