基于镉-席夫碱配合物的高选择性硫氰酸根聚氯乙烯膜电极。

Highly selective thiocyanate poly(vinyl chloride) membrane electrode based on a cadmium-Schiff's base complex.

作者信息

Ganjali M R, Poursaberi T, Basiripour F, Salavati-Niassari M, Yousefi M, Shamsipur M

机构信息

Department of Chemistry, Tehran University, Iran.

出版信息

Fresenius J Anal Chem. 2001 Aug;370(8):1091-5. doi: 10.1007/s002160100915.

DOI:10.1007/s002160100915

PMID:11583093

Abstract

A PVC membrane electrode based on a cadmium-salen (N,N'-bis-salicylidene-1,2-ethylenediamine) complex as an anion carrier is described. The electrode has an anti-Hofmeister selectivity sequence with a preference for thiocyanate at pH 1.5-11.0. It has a linear response to thiocyanate from 1.0 x 10(-6) to 1.0 x 10(-1) mol L(-1) with a slope of 59.1 +/- 0.2 mV per decade, and a detection limit of 7 x 10(-7) mol L(-1). This electrode has high selectivity for thiocyanate relative to many common organic and inorganic anions. The proposed sensor has a fast response time of approximately 15 s. It was applied to the determination of thiocyanate in a milk sample.

摘要

描述了一种基于镉-萨伦（N,N'-双水杨醛-1,2-乙二胺）配合物作为阴离子载体的聚氯乙烯膜电极。该电极具有反霍夫迈斯特选择性序列，在pH 1.5 - 11.0时对硫氰酸盐具有偏好性。它对硫氰酸盐的线性响应范围为1.0×10⁻⁶至1.0×10⁻¹ mol L⁻¹，斜率为每十年59.1±0.2 mV，检测限为7×10⁻⁷ mol L⁻¹。相对于许多常见的有机和无机阴离子，该电极对硫氰酸盐具有高选择性。所提出的传感器响应时间快，约为15秒。它被应用于牛奶样品中硫氰酸盐的测定。