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A POLAROGRAPHIC CATALYTIC WAVE OF OXYGEN INDUCED BY DIPHENYLAMINE COMPOUNDS
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作者 Jun Feng SONG Wei GUO Yin Hua HU Department of Chemistry,Northwest University,Xi’an 710069 《Chinese Chemical Letters》 SCIE CAS CSCD 1992年第1期67-68,共2页
It is reported in this paper a polarographic catalytic double wave of oxygen reduction caused by diphenylamine compounds(diphs).The electrochemical process of the wave includes the polarographic generation of the supe... It is reported in this paper a polarographic catalytic double wave of oxygen reduction caused by diphenylamine compounds(diphs).The electrochemical process of the wave includes the polarographic generation of the superoxide anion O_2^- and the dismutation of O_2^- catalyzed by diphs with redox pseudoreversibility. 展开更多
关键词 A polarographic catalytic wave OF OXYGEN INDUCED BY DIPHENYLAMINE COMPOUNDS
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Polarographic Catalytic Wave of Lysozyme 被引量:2
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作者 Gou, W Yang, YN Song, JF 《Chinese Chemical Letters》 SCIE CAS CSCD 1998年第6期557-560,共4页
This paper reports a polarographic catalytic wave of lysozyme (LE) in the presence of KIO3. The mechanism of the catalytic wave was discussed. It is illustrated by the catalytic wave of LE that, besides the Brdicka cu... This paper reports a polarographic catalytic wave of lysozyme (LE) in the presence of KIO3. The mechanism of the catalytic wave was discussed. It is illustrated by the catalytic wave of LE that, besides the Brdicka current, there exists a new kind of catalytic wave of protein. 展开更多
关键词 polarographic catalytic wave LYSOZYME PROTEIN KIO3
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Study on Electroanalytical Chemistry of Rare Earths Part 1 Catalytic Wave of Yb^(3+)-MnO_4^--HClO_4 System
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作者 卢小泉 孟晓荣 +1 位作者 康敬万 高锦章 《Rare Metals》 SCIE EI CAS CSCD 2000年第1期21-26,共6页
In the present paper, linear sweep polarography (LPS) was employed to study Yb 3+ KMnO 4 system. Results show that this system is characterized as a catalytic wave. The first step of Yb 3+ reduction was th... In the present paper, linear sweep polarography (LPS) was employed to study Yb 3+ KMnO 4 system. Results show that this system is characterized as a catalytic wave. The first step of Yb 3+ reduction was the one electron reduction to Yb 2+ , and improvement in the sensitivity of Yb 3+ was studied. Convolution voltammetry and cyclic voltammetry were employed to determine the rate constant and to confirm the process of electrode. The effects of various parameters, including pH, electrolyte, catalyst concentration and surface active substance on the reduction process were examined. 展开更多
关键词 Ytterbium ion polarographic catalytic wave Potassium permanganate
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Study and Application of Polarographic Catalytic Wave of Chlordiazepoxide in the Presence of Persulfate 被引量:3
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作者 Guo, W Lin, H +2 位作者 Liu, LM Guo, ZA Song, JF 《Chinese Journal of Chemistry》 SCIE CAS CSCD 2002年第5期502-508,共7页
Polarographic catalytic wave of chlordiazepoxide in the presence of K 2S 2O 8 was studied in aqueous and DMF/H 2O mixed solutions. The results showed that a single reduction wave in alkaline medium was the reducti... Polarographic catalytic wave of chlordiazepoxide in the presence of K 2S 2O 8 was studied in aqueous and DMF/H 2O mixed solutions. The results showed that a single reduction wave in alkaline medium was the reduction of the N=C bond in 1,2 position of chlordiazepoxide via an intermediate free radical in two one electron successive additions. When K 2S 2O 8 was present, the free radical of the N=C bond was oxidized to regenerate the original, producing a parallel catalytic wave of chlordiazepoxide. It was determined that the apparent rate constant k f of the oxidation reaction was 3.2×10 3 mol -1 ·L·s -1 . Using the catalytic wave the trace of chlordiazepoxide can be determined by linear potential scan polarography. In NH 3/NH 4Cl (pH 10.2±0.1, 0.12 mol/L)/K 2S 2O 8 (0.016 mol/L) supporting electrolyte, the second order derivative peak current of the catalytic wave was rectilinear to chlordiazepoxide concentration in the range of 3.20×10 -8 -1.60×10 -7 , 1.60×10 -7 -1.44×10 -6 and 1.44 ×10 -6 -1.44×10 -5 mol/L, respectively. The limit of detection was 9.0×10 -9 mol/L. 展开更多
关键词 CHLORDIAZEPOXIDE PERSULFATE polarographic catalytic wave free radical
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Investigation and Application of Polarographic Catalytic Wave of Oxygen Reduction Caused by Mefenamic Acid 被引量:1
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作者 宋俊峰 过玮 +1 位作者 亢晓峰 胡荫华 《Science China Chemistry》 SCIE EI CAS 1993年第8期906-911,共6页
The polarographic catalytic wave of oxygen reduction caused by mefenamic acid (MA) with redox properties was reported in this paper. The electrochemical process of the catalytic wave was proposed that the superoxide a... The polarographic catalytic wave of oxygen reduction caused by mefenamic acid (MA) with redox properties was reported in this paper. The electrochemical process of the catalytic wave was proposed that the superoxide anion O(?) was generated polarographically and the dismutation of the O(?) was catalyzed by MA to reproduce O_2 and H_2O_2. This explained chemically the scavenging of the O_2^- by MA im biomedical area. Based on the catalytic wave, a new method for the determination of MA by single-sweep polarography was developed. 展开更多
关键词 mefenamic acid[61-68-7] pharmaceutical chemistry superoxide anion O_2^+[11062-77-4] DISMUTATION polarographic catalytic wave.
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