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《Acta Chimica Sinica》 1984-10
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WANG ZHAI-ZHONG~* YUNG HONG-LIANG (Chemistry Department, Yunnan University, Kunming)  
This paper reports the differential pulse polarographic analysis of the title compound. In Britton-Robinson buffer solution at pH7.0 two cathodic waves of the compound appear at-0.46V and -0.65 V (vs. 1MKCl Ag-AgCl) respectively. The first wave is used for quantitative analysis. A linear relationship exists between the wave height and the concentration of the compound in the range of 5.0×10~(-7)M to 5.0× 10~(-5)M. The detection limit is about 3.0×10~(-7)M. Furthermore, we have studied the polarographic behaviors and the reaction mechanism. The electrode process has also been investigated by means of cyclic voltammetry. It shows that the polarographic wave is an adsorption wave and that the electrode reaction is irreversible. The analytical procedure proposed in this paper ia simple, rapid and accurate for the determination of the compound in the capsule and crude medicine with satisfactory results.
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