Synthesis of a New Oxime and Its Application to the Construction of a Highly Selective and Sensitive Co(II) PVC-Based Membrane Sensor

Abstract

A cobalt(II) ion-selective membrane sensor has been fabricated from a poly vinyl chloride (PVC) matrix membrane containing a new oxime compound (oxime of 1-(2-oxocyclohexyl)-1,2-cyclohexanediol, OXCCD) as a neutral carrier, sodium tetraphenyl borate (NaTPB) as an anionic excluder and o-nitrophenyloctylether (o-NPOE) as a plasticizing solvent mediator. The membrane sensor exhibits a linear potential response in the concentration range of 1.0 x 10(-1) - 1.0 x 10(-6) M of Co2+. The electrode displays a Nernstian slope of 29.8 mV decade(-1) in the pH range of 3.5 - 8.0. The sensor also exhibits a fast response time of < 25 s. The detection limit of the proposed sensor is 9.0 x 10(-7) M (approximately 40 ng/ml), and it can be used over a period of two months. The selectivity of the sensor with respect to other cations (alkali, alkaline earth, transition and heavy metal ions) is excellent. The practical utility of the sensor has been demonstrated by using it as an indicator electrode in the potentiometric titration of Co2+ with EDTA and for the direct determination of Co(II) in wastewater of the electroplating industry.

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

“…8,14,[16][17][18][19][20][21][22][23][24][25][26][27][28] This is due to the influence of the plasticizer on the dielectric constant of the membrane phase, the mobility of the ionophore molecules and the state of the ligands. 23,24 As can be seen from Table 1, among four different plasticizers used, DOP resulted in the best response slope and linearity.…”

“…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.…”

Cobalt(II) ion-selective electrode with solid contact

“…So far only limited number of cobalt-selective sensors has been described in the literature on the topic [9][10][11][12][13][14][15][16][17]. Moreover, most of these electrodes suffer a lack of stability, a limited concentration range with theoretical response, and exhibit low lifetime and high response time.…”

“…Moreover, most of these electrodes suffer a lack of stability, a limited concentration range with theoretical response, and exhibit low lifetime and high response time. Furthermore almost all electrodes [9,10,[12][13][14][15][16][17] have an internal filing solution, which requires some operation and vertical position.…”

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

“…[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. …”