钪—茜素S—铜—硫脲体系的络合物吸附波

钪—茜素S—铜—硫脲体系的络合物吸附波 POLAROGRAPHIC ADSORPTIVE WAVE OF SCANDIUM-ALIZARIN S-COPPER-THIOUREA COMPLEX 黎拒难 1 first-author 赵藻藩 1 邸凤玲 1 钟家清 1 宜昌地质矿产研究所 宜昌地质矿产研究所 < 正 > 前文[1]研究了钪—茜素S络合物吸附波。该体系的络合物吸附波虽有一定的选择性,但灵敏度尚不够高。为了提高测定Sc 3+ 的灵敏度,我们试图使上述络合物与铜（Ⅰ）硫脲络离子形成吸附性更强的离子缔合物。实验表明,当有Cu 2+ 和硫脲（TU）存在时,该络合物吸附波的灵敏度显著提高,钪的检测限达4×10 -8 M,在6×10 -8 —4×10 -8 M范围内,波高与钪的浓度成线性关系。应用孩方法测定了矿石中的微量钪,获得满意的结果。采用多种方法探讨了该体系的极谱波的性质和机理。 In 0.02M potassium biphthalate buffer （pH≈3.8） containing glycine, copper chloride and thiourea,by using single sweep oscillopolarography, there is a sensitive derivative polarographic adsorptive wave for Sc-Alizarin S-copper-thiourea complex. There is a linear dependence of wave height on scandium concentration over a range of 6×10 -8 -4×10 -6 M.The detection limit is 4×19 -8 M.The method has been applied to determine trace amounts of Sc in minerals. Theproperties and mechanism of this polarographic wave have been studied and discussed. The polarographic wave is probably produced by adsorption of Sc-Alizarin S and Cu（TU·FDS）associated complex and followed by reduction of Alizarin S at the DME. 中国科学院科学基金 1985-03-01 2021-04-01 3