학술논문
Ion recognition: synthesis of 2-methyl-2,4-di (2-thienyl)-2,3-dihydro-1H-1,5-benzodiazepine and its application in construction of a highly selective and sensitive Ag+ membrane sensors
Document Type
article
Source
Journal of the Brazilian Chemical Society. December 2006 17(7)
Subject
Language
English
ISSN
0103-5053
Abstract
A highly selective and sensitive plasticized membrane sensor for Ag+ ions based on 2-methyl-2,4-di(2-thienyl)-2,3-dihydro-1H-1,5-benzodiazepine (MTHB) as membrane carrier was prepared. The sensor shows a linear dynamic range of 1.0 × 10-6 -1.0 × 10-1 mol L-1, with a Nernstian slope of (58.5±0.3) mV decade-1, and a detection limit of 5.0 × 10-7 mol L-1 (~54 ppb). It has a fast response time of 10 s and can be used for at least eight weeks without any considerable divergences in its potentials. The proposed sensor revealed very good selectivities with respect to the most of common metal ions. The proposed sensor could be used in a pH range of 4.0-8.0. It was successfully used as an indicator electrode in potentiometric titration of Ag+ with NaCl.