铜(Ⅱ)-2,2′-联吡啶-铬天菁S三元络合物极谱吸附波及应用  

Polarographic Adsorptive Wave of Copper (Ⅱ)-2,2'-Dipyridyl-Chrome Azurol S Ternary Complex and Its Application

作　　者：周连君[1] 蔡玉钦[1] 尤进茂[1] 高根之[1] 杨在伦[1] 

机构地区：[1]曲阜师范大学化学系,曲阜273165

出　　处：《分析化学》1996年第7期812-815,共4页Chinese Journal of Analytical Chemistry

摘　　要：本文提出了一个灵敏的具有选择性的溶出伏安法测超痕量铜的方法。在0.01mol／LNH3·H2O-NH4Cl溶液中（pH＝9．3），铜（Ⅱ）－2，2′-联吡啶（Dipy）-铬天菁S（CAS）能生成具吸附性的电活性三元络合物，在＋0.1V（vs．SCE）电位下富集，阴极溶出峰电位是一0．18V，峰电流与Cu（Ⅱ）的浓度在9．0×10－9～7.0×10－7mol／L范围内成正比，检测限是3．0×10－9mol／L，这一方法已用于测定环境水中痕量铜，回收率在98．5％，102．5％之间。A sensitive and selective stripping voltammetric ultratrace determination of copper is described.In 0.01 mol/L NH4OH-NH4Cl solution (pH=9. 3) copper(Ⅱ), 2, 2' -dipyridyl (Dipy) and chrome azurol S(CAS) can form an adsorbable electroactive ternary complex.The preconcentration potential is +0. 1 V(vs. SCE) and the cathodic stripping peak poten tial is - 0. 18 V. The peak current is proportional to the concentration of Cu (Ⅱ) over a range of 9.0×10-9～7.0×10-7mol/L and the detection limit is 3. 0×10-9mol/L. This method has been used to determine trace amounts of Cu(Ⅱ) in environmental water with a recovery of 98. 5 % ～102. 5 %.

关 键 词：铜(Ⅱ) 铬天菁S 联吡啶 吸附溶出伏安法 

分 类 号：O614.121[理学—无机化学] O657.14[理学—化学]