W(Ⅵ)-二苯基乙醇酸-2，2＇-联吡啶极谱波研究及应用于岩溶地下水分析  

Study on W(Ⅵ)-Diphenyl Glycollic Acid-2,2′bipyridine Polarographic Wave and Its Application to the Determination of Trace Tungsten in Karst Groundwater

作　　者：黄俊杰[1,2] 陈晓波[3] 

机构地区：[1]中国地质大学资环学院,北京100083 [2]中国地质科学院岩溶地质研究所,广西桂林541004 [3]桂林工学院资环学系,广西桂林541004

出　　处：《分析科学学报》2010年第1期94-96,共3页Journal of Analytical Science

摘　　要：在0．05mol／L硫酸溶液中，W（Ⅵ）与二苯基乙醇酸络合在-0．70V（VS．SCE）产生一灵敏的阴极极谱催化波，体系中加入2，2’-联吡啶后，W（Ⅵ）配合物的极谱波明显增高，峰电位负移到-0．80V，标准曲线斜率变大，体系的稳定性显著提高。W（VI）在0．02～50ng／mL范围与峰高呈良好线性关系，检出限达1．8×10^-11mol／L。实验确定了最佳条件，拟定了不经分离富集直接测定岩溶地下水中痕量钨的方法。此外对极谱波的性质进行了探讨，证明该极谱波为配合物吸附催化氢波，讨论了阳离子表面活性物质对催化氢波的影响及相关作用机理。Tungsten complexed with diphenly glycolate and had a cathodic polarographic catalytic wave at -0.7 V （vs. SCE） in 0. 05 mol/L sulfuric acid solution. With the presence of dipyridine, the polarographic catalytic wave was significantly increased many times together with 0. 9 V negative shift of peak potential, and the system stability was also improved. The detection limit was up to 1.8 × 10^-11mol/L. The method was applied for the direct determination of trace tungsten in karst groundwater without separation and preconcentration. The mechanism of the polarographic wave and the effect of cationic surfactant were discussed. It was proved that the polarographic wave was catalytic hydrogen wave.

关 键 词：钨 极谱催化波 二苯基乙醇酸 2 2’-联吡啶 岩溶地下水 

分 类 号：O657.14[理学—分析化学]