用钯(Ⅱ)-7-碘-8-羟基喹啉-5-磺酸络合物吸附波测定钯  

Determination of Palladium With the Adsorptive Wave of Palladium-7-Iodo-8-Hydroxyquinoline-5-Sulphonic Acid Complex

作　　者：王曙[1] 田东林[1] 

机构地区：[1]四川轻化工学院化工系,自贡643033

出　　处：《分析化学》1996年第7期802-805,共4页Chinese Journal of Analytical Chemistry

基　　金：四川省教委科研基金

摘　　要：本文提出了极谱测定微量钯的钯-7-碘-8-羟基喹啉-5-磺酸（7－I－H2QS）新体系。在0．10mol／LHAc，5．0×10－5mol／L7－I－H2QS溶液中，在线性扫描示波极谱仪上，钯（Ⅱ）有一灵敏的络合物吸附波，峰电位为-0.54V（vs.SCE），波高与钯浓度在7.0×10－8～5。0×10－6mol／L范围内呈良好的线性关系。当含量更低时，在悬汞电极上用吸附溶出伏安法测定，它集时间为200s时，线性范围为1．9×10－9～9．9×10－8mol／L。检出限为3．8×10－10mol／L（38ng／L）。对极谱波性质进行了探讨，用于矿样中痕量钯的测定，结果满意。A new system of palladium-7-iodo-8-hydroxyquinolne-5-sulphonic anid (7-I-H2QS) for the determination of palladium by polarography has been proposed. In a solution of 0. 10 mol/L HAc and 5.0×10-5mol/L 7-I-H2QS, a sensitive adsorptive wave of palladi um-7-I-H2QS complex is obtained by linear-sweep polarography. The peak potential of the wave appears at -0. 54 V(vs. SCE). The change of peak height of derivative wave with con centration of palladium is linear in the range of 7. 0×10-8～5. 0×10-6mol/L. Using a hang ing mercury drop electrode for adsorptive stripping voltammetry and preconcentrating for 200 s, the calibration curve for palladium is linear in the range of 1. 9 × 10- 9～9. 9 ×10-8mol/L.The detection limit is 3. 8 × 10-10'mol/L (for a 10 min preconcentration time). The method has been successfully applied to the determination of palladium in mineral. The characteris tics of the polarographic wave has been investigated by several electrochemical methods.

关 键 词：钯 络合物 吸附波 碘 羟基 喹啉 磺酸 7-IH2QS 

分 类 号：O614.823[理学—无机化学] O657.14[理学—化学]