用2-QADN2,7-金属络合物示波极谱法同时测定铜镍钴镉

Simultaneous Polarographie Determination of Cop per. Nickel, Cobalt and Cadmium with 1-(2-Quinolylazo)-2, 7-Dihydroxynaphthalene

本文研究了2-QADN2,7-金属络合物的极谱特性。在pH9.60的缓冲溶液中,Cu(Ⅱ)、Ni(Ⅱ)、Co(Ⅱ)和Cd(Ⅱ)与2-QADN2,7的络合物在-0.37、-0.69、-0.77和-0.82V产生灵敏的极谱波,利用这些波可测定痕量的铜、镍、钴和镉。铜的检测下限为2.0×10^(-8)mol/L,镍、钴及镉的检测下限为5.0×10^(-8)mol/L。提出的方法用于同时测定头发和茶叶中的痕量铜、镍和钴,结果满意。

The polarographic behaviours of 1-(2-quinolytazo)-2,7-dihydroxynaphthalene (2-QADN2, 7) have been studied. In prig. 60 buffer solution the complexes of copper, nickel, cobalt and cadmium with 2-QADN2, 7 give sensitive polarographic waves at-0.37, -0.69, -0.77 and - 0.82V,respectively,which can be used for simultaneous determination of these elements. The limit of detection of copper is 2.0×10^(-8)mol/L,and that of nickel,cobalt and cadmium are all 5.0×10^(-8)mol/L. The proposed method was Used to determine simultaneously trace copper, nickel, cobalt and cadmium in human hair and tea samples.