离子选择性电极_水杨酸根_

水杨醛肟铜络合物中性载体高选择性水杨酸根电极的研究

http://www.100md.com 《分析化学》 2006年第5期

离子选择性电极,水杨酸根,,水杨醛肟铜(Ⅱ)，离子选择性电极,水杨酸根,摘要,关键词,1引言,2实验部分,3结果和讨论,References

     摘要

    采用合成的Schiff碱金属络合物水杨醛肟铜(Ⅱ) 、锌(Ⅱ)、镍(Ⅱ)为中性载体制备阴离子选择性电极。结果表明：水杨醛肟铜(Ⅱ)对水杨酸根(Sal-)具有高选择性及优良的电位响应性能，电极呈现反Hofmeister选择性行为，其选择性次序为Sal->ClO-4>SCN->I->NO-2>NO-3>Br->Cl->OAc->SO2-4。采用交流阻抗技术和紫外可见光谱技术研究了电极的响应机理。该电极具有响应快、重现性好、检出限低和制备简单等优点。将电极用于药品及人体尿液分析，结果令人满意。

     关键词 水杨醛肟铜(Ⅱ)，离子选择性电极,水杨酸根

    A Selective Membrane Electrode for Salicylate Ion Based on a Bissalicylaldoxime Complex of Copper(Ⅱ) as Ionophore

    Wang Fuchang, Chai Yaqin, Yuan Ruo*, Gui Guofeng

    (Chongqing Key Laboratory of Analytical Chemistry, College of Chemistry and Chemical Engineering,Southwest University, Chongqing 400715)

    Abstract The response characteristics of a new potentiometric membrane electrode with unique selectivity towards salicylate ion (Sal-) are reported. The electrode was prepared by incorporating bissalicylaldoxime complex of copper(Ⅱ) into a plasticized polyvinyl chloride (PVC)membrane. The optimized composition of membrane was 3.7 (w/w) ionophores, 63.4 (w/w) membrane solvent (oNPOE) and 32.9 (w/w) PVC. The resulting electrode exhibits antiHofmeister selectivity sequence: Sal->ClO-4>SCN->I->NO-2>NO-3>Br->Cl->OAc->SO2-4 and a nearNernstian potential linear range for salicylate from 1.0×10-1 to 7.0×10-6 mol/L with a detection limit of 6.0×10-6 mol/L and a slope of -58.5 mV/pCSal- in pH 4.0 of phosphate buffer solution at 20℃. The ultravioletvisible (UV/Vis) spectra and alternating current (A.C.) impedance studies showed that the excellent selectivity for salicylate was related to the unique interaction between the central metal and the analyte and a steric effect associated with the structure of the carrier. The electrode was successfully applied to the determination of salicylate in human urine and pharmaceutical preparations. ......

百拇医药网 http://www.100md.com/html/DirDu/2006/06/20/01/46/22.htm

您现在查看是摘要页，全文长 9455 字符。