以不对称席夫碱金属铜(Ⅱ)配合物为载体的硫氰酸根离子选择性电极
On the SCN--Ion Selective Electrode with Carrier of Complex of Unsymmetrical Schiff Base with Cu(Ⅱ)
摘 要
研制了以水杨醛缩乙酰丙酮乙二胺合铜(Ⅱ)金属配合物为中性载体的阴离子选择性电极.试验表明,以水杨醛缩乙酰丙酮乙二胺合铜(Ⅱ)金属配合物为中性载体的电极对硫氰酸根具有良好的选择性和电位响应特性.在pH 5.0磷酸盐缓冲体系中,电极电位呈现近能斯特响应,线性范围为7.5×10-5~1.0×10-1mol·L-1,斜率为-53.8 mV·dec-1(25 ℃),检出限(3S/N)为6.5×10-6mol·L-1.用紫外分光光度法和交流阻抗法研究了电极反应的选择性及其响应机理.将该电极用于实验室废水中硫氰酸根离子的检测,测得该方法的回收率在95.3%~107.9%之间.
硫氰酸根离子
铜(Ⅱ)与席夫碱的络合物
中性载体
废水
Ion selective electrode
SCN--ion
Complex of Cu2+-ion with schiff bases
Neutral carrier
Waste water
Abstract
By using the complex formed between unsymmetrical Schiff base and cupric ion as neutral carrier,an anion selective electrode was prepared. It was found that excellant selectivity and potential response toward SCN--ion were achieved by the anion selective electrode prepared by using the Cu2+-complex of a particular Schiff base (i.e.,salicylaldehyde-acetylacetone-ethylenediimine) as neutral carrier,which showed approximate Nernst potential response in the range of 7.5×10-5 to 1.0×10-1mol·L-1 with detection limit (3S/N) of 6.5×10-6mol·L-1,and slope of -53.8 mV·dec-1 in a PBS of pH 5.0 at 25 ℃. The selectivity of the electrode reaction between SCN--ion and the Cu2+ ion in the carrier complex was studied by UV-spectrophotometry and the mechanism of the potential response was studied by the AC impedance method. Recovery of the method was tested by standard addition method on the base of samples of waste water drained from chemical laboratory,results of recovery found were in the range of 95.3% to 107.9%.
中图分类号 O657.1
所属栏目 工作简报
基金项目
收稿日期 2008/10/11
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备注归国风(1979-),女,河南人,讲师,硕士,主要从事电化学传感器的研究.
引用该论文: GUI Guo-feng,NIE Xiao-yan,LIU Hong. On the SCN--Ion Selective Electrode with Carrier of Complex of Unsymmetrical Schiff Base with Cu(Ⅱ)[J]. Physical Testing and Chemical Analysis part B:Chemical Analysis, 2009, 45(12): 1424～1427
归国风,聂晓燕,刘红. 以不对称席夫碱金属铜(Ⅱ)配合物为载体的硫氰酸根离子选择性电极[J]. 理化检验－化学分册, 2009, 45(12): 1424～1427
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【7】YUAN Ruo,WANG Xiu-ling,CHAI Ya-qin,et al. Highly selective thiocyanate electrode based on bis-bebzoin-semitriethylene tetraamine binuclear copper(Ⅱ) complex as neutral carrier[J]. Electrochem Commun,2003,5(8):717-721．
【8】柴雅琴,孙志勇,袁若,等.二氮杂四烯基金属配合物中性载体高选择性水杨酸根离子电极的研究[J].化学学报,2002 60(12):2192-2196．
【9】AMINI M K,RAFI A,GHAEDI M,et al. Bis(2-mercaptobenzoxazolato)mercury(Ⅱ) and bis(2-pyridinethiolato)mercury(Ⅱ) complexes as carriers for thiocyanate selective electrodes[J]. Microchenical,2003,75:143-150．
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【12】MOODY G L,OKE R B,THOMAS J D R. As calcium-sensitive electrode based on a liquid ion exchanger in a poly(vinyl chloride) Matrix[J]. Analyst,1970,95:910-918．
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