可溶性聚酰亚胺中非电活性部分的结构对其电化学行为的影响

发现电化学活性链段相同而非电化学活性链段不同的两种可溶性聚酰亚胺的电化学性能有较大的不同，表明非电化学活性链段对可溶性聚酰亚胺的电化学性能也有较大的影响。这可能是由于非电化学活性链段的不同影响了可溶性聚酰亚胺与溶剂的相互作用结果。     

有机阳离子12-钨磷杂多酸盐电化学性质的研究

以N，N-二甲基甲酰胺（DMF）为溶剂、四丁基溴化铵（Bu4NBr）为支持电解质、玻碳（GC）为工作电极，用循环伏安（CV）法研究了6种有机阳离子的α-12-钨磷杂多酸盐Q3PW12O40[Q=（CH3）4N，（C4H9）4N，C10H29（CH3），N，C12H25（CH3）3N，C14H29（CH3）N，C18H37（CH3）3N]的电化学特性。结果表明：Q3PW12O40在GC电极上有4对准可逆的还原一氧化波，其还原一氧化峰电位和峰电流的差别甚小，因而有机阳离子碳链的大小对12-钨磷杂多阴离子的电化学性质影响较小。这些特性从理论上进行了解释。     

钙试剂羧酸钠盐的伏安行为研究

研究10个酸碱介质近百种条件下钙试剂的极谱行为，提出了对钙试剂自身及其金属离子络合物的吸附波进行研究的适宜条件，详细研究了钙试剂在氨－氯化铵体系中极谱行为。     

含钙、含钡和含镍钡镁锰矿的合成及在水溶液中电化学性能

在改进的碱性条件下合成晶型良好的纳米δMnO     

萘乙酸电化学降解机理研究

用三电极体系循环伏安法研究了萘乙酸溶液体系的电化学行为,对萘乙酸的电极还原-氧化过程及其可逆性、控制因素进行了探索性研究;研究了温度、扫描速率、通氮除氧、硫酸钠、扫描次数等因素对萘乙酸溶液电极过程的影响.该研究结果为环境中萘乙酸电化学处理工艺的选择提供了参考依据.     

Why was M. S. Tswett’s chromatographic adsorption analysis rejected?

The present paper claims that M. S. Tswett’s chromatographic adsorption analysis, which today is a ubiquitous and instrumentally sophisticated chemical technique, was either ignored or outright rejected by chemists and botanists in the first three decades of the twentieth century because it did not make sense in terms of accepted chemical theory or practice. Evidence for this claim is culled from consideration of the botanical and chemical context of Tswett’s technique as well as an analysis of the protracted debate over Tswett’s chromatographic analysis of chlorophyll between him and Leon Marchlewski, a noted chlorophyll chemist of the period. In this way, the paper expands and amends what it calls the ‘textbook story’ of the early history of chromatography, examples of which may be found in historical notes in many textbooks of chemical instrumental analysis and numerous short articles in chemistry journals. The paper also provides an accessible introduction to the early history of chromatography for historians of science likely to know little or nothing about it.     

碳纤维电极溶出法测定电气塑料中的镉含量

本文研究了碳纤维电极在电气塑料中的镉测定中的应用,并进行了性能测试。在10.0mg/LHg2 —0.25mol/L盐酸溶液中测量镉,检测限达到0.080μg/L(电富集10min),用于测定电气塑料中的镉含量。标准加入回收率为92.6%。变异系数(n=11)<7.5%。碳纤维电极的峰高均值为276.51μA/V,标准差为3.112μA/V,变异系数为1.116%。碳玻电极的峰高均值为365.4μA/V,标准差为5.2468μA/V,变异系数为1.512%。碳纤维电极具有比GC电极更高的稳定性。     

The electrochemical properties of thionine adsorbed monolayer on gold electrode

A gold electrode modified with adsorbed thionine monolayer was investigated with ac impedance and cyclic voltammetry method. It was found there were some different redox properties for the adsorbed thionine depended on the different potential scanning rate. At the slower potential scanning rate (10 mV· s⁻¹), the dimer of thionine appeared and possessed the catalytic activity for the oxidation of ascorbic acid. The underpotential deposition (UPD) and the bulk deposition of Cu²⁺ were also employed to investigate the monolayer of adsorbed thionine. Biography: Fang Cheng (1971-), male, Ph. D candidate, research direction: electroanalysis.     

碳纳米管/壳聚糖复合膜修饰电极测定尿酸的研究

制备了一种碳纳米管/壳聚糖复合膜修饰的玻碳电极,并通过循环伏安法和计时库仑法详细研究了尿酸在复合膜修饰电极上的电化学行为.对诸如支持电解质,溶液pH,富集时间等实验条件进行了优化,结果表明,在pH＝3.95 0.1 mol/L柠檬酸钠盐支持电解质中,尿酸在复合膜修饰电极上具有良好的电化学响应.相对于裸玻碳电极,尿酸的氧化峰电位负移20 mV,峰电流显著提高,锋形更为尖锐,表明复合膜对尿酸的电化学氧化具有一定的催化作用,计时库仑法结果表明尿酸在复合膜修饰电极上为两电子两质子的电子转移过程.尿酸的氧化峰电流与其浓度分别在5.0×10－9～5.0×10－7 mol/L范围内和1.5×10－6～1.0×10－4 mol/L范围内呈良好的线性关系,线性相关系数分别是0.994 7和0.988 4.开路富集120 s后,检出限为5.0×10－9 mol/L.将该复合膜修饰电极应用于人体实际尿样中尿酸的测量,结果令人满意.