2,7-TADN极谱特性研究(Ⅱ)——铜(Ⅱ)-2,7-TADN-乙二胺配合物吸附波测定痕量铜

Studies on Polarographic Behavior of 2,7-TADN(Ⅱ)——Polarographic Adsorptive Complex Wave of Copper-2,7-TADN-Ethylenediamine

研究了Cu^(2+)-2,7-TADN-乙二胺配合物的极谱行为。在氢氧化钠、乙二胺(en)和2,7-TADN底液(pH约为12)中,铜(Ⅱ)能产生Cu^(2+)-2,7-TADN-en三元配合物吸附波,其峰电位为-0.86V。铜含量在2.0×10^(-8)-5.0×10^(-6)M范围内,峰高与铜浓度成线性关系。检测下限达1.0×10^(-8)M。

In a sodium hydroxide solution of pH12 containing ethylenediamine(en)and 1-(2-Thiazoiylazo)-2,7-Naphthalenediol(2,7-TADN)a sensitive adsorptive complex wave of Cu(2,7-TADN)(en)was observed by using single-sweep polarography.The peak potential is-0.86V,the peak hights being linearly proportional to copper concentration over a range of 2.0×10^(-8) to 5.0×10^(-6)M.The determination limit is 1.0×10^(-8)M.This method has been applied to determine trace amount of copper in ores and pure tin.