双极谱峰指示催化动力学极语法测定痕量钒  

Catalytic Polarographic Determination of Vanadium(V) by Using Double Polarographic Peak

作　　者：王术皓[1] 杜凌云[1] 李斌[1] 张爱梅[1] 

机构地区：[1]聊城师范学院化学系,聊城252059

出　　处：《分析化学》2000年第9期1140-1143,共4页Chinese Journal of Analytical Chemistry

摘　　要：在硫酸介质中，以酒石酸为活化剂，痕量机对溴酸钾氧化乙基极的反应具有极强的催化作用，研究了最佳反应条件，且发现在氨性缓冲溶液中乙基橙及其氧化产物具有良好的极谱峰，以极谱法监测催化反应过程中乙基橙及其氧化产物浓度的变化，建立了催化动力学极谱法测定痕量帆的新方法。方法的线性范围为０．２５～３．５μｇ／Ｌ，检出限为０．１２μｇ／Ｌ。应用于食品中痕量钒的测定，结果满意。A new catalytic polarographic method for the determination of trace amounts of vanadium(V) has been proposed. The method is based on the catalytic effect of V(V) on the oxidation between ethyl orange and bromate in the medium of sulfuric acid, with tartaric acid as an activator. Ethyl orange and its oxidation product exhibits volumetric peak at - 0.62 V and - 0.52 V (vs.SCE) in ammoniac buffer solution respectively. Under optimal experiment condition, the nation was monitored by measuring the peak height decrease at -0.62V (△IP1) and the peak height increase at -0.52V (△Ip2 ). Vanadium is determined according to △I = (△Ipl + △Ip2), the linear range of determination is 0.25 - 3. 50 μg/L for vanadium(V), the detection limit is 0. 12 μg/L. The method has been used to determine trace vanadium in food samples.

关 键 词：钒 催化反应 极谱法 痕量分析 

分 类 号：O614.511[理学—无机化学] O657.14[理学—化学]