Novel Potentiometric Membrane Sensor for the Determination of Trace Amounts of Chromium(III) Ions

Abstract

A plasticized Cr3+ ion sensor by incorporating 2,3,8,9-tetraphenyl-1,4,7,10-tetraazacyclododeca-1,3,7,9-tetraene (TTCT) ionophore exhibits a good potentiometric response for Cr3+ over a wide concentration range (1.0 x 10(-6)-1.0 x 10(-1) M) with a slope of 19.5 mV per decade. The sensor response is stable for at least three months. Good selectivity for Cr3+ in comparison with alkali, alkaline earth, transition and heavy metal ions, and minimal interference are caused by Li+, Na+, K+, Co2+, Hg2+, Ca2+, Pb2+ and Zn2+ ions, which are known to interfere with other chromium membrane sensors. The TTCT-based electrode shows a fast response time (15 s), and can be used in aqueous solutions of pH 3-5.5. The proposed sensor was used for the potentiometric titration of Cr3+ with EDTA and for a direct potentiometric determination of Cr3+ content in environmental samples.

A novel method for fast enrichment and monitoring of hexavalent and trivalent chromium at the ppt level with modified silica MCM-41 and its determination by inductively coupled plasma optical emission spectrometry

“…The tetraazamacrocyclic compound (TAMC) with a rigid cavity and sufficient lipophilicity can form very selective complex with Cr(III) ion 24 , and it was used as an excellent ionophore in construction of a highly selective and sensitive Cr(III) membrane sensor 24 . Thus, we were interested to consider its ability as a suitable modifier for silylated MCM-41 in separation and pre-concentration of Cr(III) in different samples.…”

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

“…was dipped into the mixture for about 10 s, so that a transparent membrane of about 0.3 mm thickness was formed. 27,28 The tube was then pulled out of the solution and kept at room temperature for 10 h. The tube was then filled with an internal filling solution (1.0 × 10 -3 mol L -1 AgNO 3 ). The electrode was finally conditioned for 24 h by soaking in a 1.0 × 10 -3 mol L -1 solution of AgNO 3 .…”

“…[8][9][10][11][12][13] Chen and coworkers 8,10 reported polymeric membranes based on nitrogen containing calixarene derivatives; Mahajan et al 9 12,13 In the recent decade, we have also introduced a number of selective membrane sensors for transition and heavy metal ion. [14][15][16][17][18][19][20][21][22][23][24][25][26][27][28] In this work, we wish to report the construction of a highly selective and sensitive Ag + membrane sensor based on 2-methyl-2,4-di(2-thienyl)-2,3-dihydro-1H-1,5-benzodiazepine (MTHB) for the monitoring of Ag + ion concentration. …”

Flow-Injection Potentiometry by Poly(vinyl chloride)-Membrane Electrodes with Diphosphoryl-dicarboxylicacid-p-tert-butylcalix[4] arene Ionophore for the Determination of Th(IV) Ions

“…Marocyclic ligands have the ability to discriminate among closely related metal ions based on their radii (ring size effect). 8,9 In recent years, we have reported the successful use of some different ion carriers in the construction of poly(vinyl chloride) (PVC)-based selective electrodes for Uranyl(II), 10,11 Cu(II), 12 Cr(III), 13 Co(II), 14 and some other ionic species. In this paper, we first report on the preparation of a PVC membrane (PME) and coated graphite electrodes (CGE) based on a new functionalized calix [4]arene (Fig.…”