基于铈双水杨醛缩乙二胺的高选择性碘离子膜电极。

Highly selective iodide membrane electrode based on a cerium salen.

作者信息

Ganjali Mohammad Reza, Poursaberi Tahereh, Hosseini Morteza, Salavati-Niasary Masoud, Yousefi Mohammad, Shamsipur Mojtaba

机构信息

Department of Chemistry, Tehran University, Iran.

出版信息

Anal Sci. 2002 Mar;18(3):289-92. doi: 10.2116/analsci.18.289.

DOI:10.2116/analsci.18.289

PMID:11918187

Abstract

A highly selective PVC membrane electrode based on a cerium-salen complex was prepared. The sensor displays an anti-Hofmeister selectivity sequence with a preference for iodide ion over many common organic and inorganic anions. The proposed electrode exhibits a near-Nernstian behavior over a wide concentration range (5.0 x 10(-2) - 8.0 x 10(-6) M) with a slope of 57.5 mV per decade, and a detection limit of 6.0 x 10(-6) M. The electrode has a very fast response time and can be used in the pH range of 3.0 - 1 1.0. It was applied, as an indicator electrode, in potentiometric titration of Ag+ ions.

摘要

制备了一种基于铈-水杨醛络合物的高选择性聚氯乙烯膜电极。该传感器呈现出反霍夫迈斯特选择性序列，相对于许多常见的有机和无机阴离子，它更倾向于碘离子。所提出的电极在较宽的浓度范围（5.0×10⁻² - 8.0×10⁻⁶ M）内表现出近能斯特行为，斜率为每十年57.5 mV，检测限为6.0×10⁻⁶ M。该电极响应时间非常快，可在pH值为3.0 - 11.0的范围内使用。它作为指示电极应用于银离子的电位滴定。