Studies on Speciation of Arsenious Compounds by Capillary Zone Electrophoresis

采用毛细管区带电泳，以磷酸盐为缓冲溶液分离了5种砷的化合物：AS（Ⅲ）、dMA、AnA、MMA和AS（V）.用紫外吸收法在191nM波长下，对实验条件进行了优化；使用扩展光程毛细管研究了实验方法的重现性；测定了各种砷化合物的峰面积与浓度的关系，在最大进样量时测定了检出限，并将该方法用于合成样品的分析.Using phosphate as buffer solution, five arsenic species: arsenite (As (Ⅲ)),monomethylarsonic acid (MMA), arsanilic acid (ANA), sodium dimethylarsinate (DMA) and arsenate (As (Ⅴ) ) have been separated by capillary zone electrophoresis.Experiment conditions were optimized when the on-line UV detection was operated at 191 nm.The reproducibility of this method has been studied using extended light length capillary.Relation between signal peak area and sample concentration has been measured, and using the largest injection volume, the detection limit has been determined.Some kind of spiked sample has also been detected.国家自然科学基

Studies on speciation of arsenious compounds by capillary zone electrophoresis

Using phosphate as buffer solution, five arsenic species: arsenite(As(II)), monomethylarsonic acid(MMA), arsanilic acid(ANA), sodium dimethylarsinate(DMA) and arsenate (As(V)) have been separated by capillary zone electrophoresis, Experiment conditions were optimized when the on-line UV detection was operated at 191 nm. The reproducibility of this method has been studied using extended light length capillary. Relation between signal peak area and sample concentration has been measured, and using the largest injection volume, the detection limit has been determined. Some kind of spiked sample has also been detected

Studies on Electrochemical Synthesis of 4,5-Disubstituted-1,2- Benzoquinones and the Reaction Mechanism

邻苯二酚在不同亲核试剂存在下经电解氧化 ,一步合成了 4,5_二取代_1,2_苯醌类化合物 ;对电解氧化_迈克尔加成反应进行了探讨 ,提出了可能的反应历程 .The oxidation peak potentials( E p) of alinine derivates and catechol in 0.1 mol/L KCl+15% alcohol solution were measured by cyclic voltammograms technique. The electrochemical oxidation condition was set according to the E p. Three derivates of 4,5_disubstituted _1,2_benzoquinones were prepared via electrochemical oxidation_Michael addition reaction. The possible mechanism of electrochemical oxidation_Michael addition reaction is presented.作者联系地址：中山大学化学与化学工程学院!广东广州510275,中山大学化学与化学工程学院!广东广州510275,中山大学化学与化学工程学院!广东广州510275,中山大学化学与化学工程学院!广东广州510275,中山大学化学与化学工程学院!广东广州510275Author's Address: Inst.of Chem. and Chem. Engin. of Zhongshan Univ., Guangzhou 510275,China$$