Highly Selective and Sensitive Tin(II) Membrane Electrode Based on a New Synthesized Schiff's Base

Abstract

Studies on complex formation of tris(3-(2-hydroxybenzophenone)propyl)amine (THPA) with a number of metal ions in acetonitrile solution revealed the occurrence of a selective 1 : 1 complexation of the proposed ligand with Sn 2þ ion. Consequently, THPA was used as a suitable neutral ionophore for the preparation of a polymeric membrane-selective electrode. The electrode exhibits a Nernstian behavior with a slope of 29.4 AE 0.3 mV per decade and a detection limit of 2.0 Â 10 À7 M. It also showed a good selectivity for Sn 2þ ions in comparison with some of group A and B metal ions over a wide concentration range of 5.0 Â 10 À7 -1.0 Â 10 À1 M. Improved selectivity was achieved compared to the best selectivity recently reported by other authors for tin(II). The electrode was successfully applied to the determination of Sn 2þ ion in waste water and various canned products.

Determination of terbium in phosphate rock by Tb3+-selective fluorimetric optode based on dansyl derivative as a neutral fluorogenic ionophore

“…As is clear from Table 2, the use of DBP as plasticizer resulted in a large widening of measuring range of the propose optical sensor (i.e., by some three orders of magnitude) over the membrane based on other plasticizers, Table 2 is also indicative of the pronounced influence of the amount of fluoroionophore on the working range of the optical sensor. An increase in the amount of L from 1% to 4% resulted in an improved sensitivity emphasizing the expected increase in sensitivity of the optical sensor in the presence increased amount of the fluoroionophore in membrane phase [39,43,44]. It should be noted that the use of 5% L in the preparation of membrane sensor caused a very intense fluorescence, which fell out of the detection range of the instrument used.…”

“…In addition, the nature of plasticizer is well-known to influence largely the measuring concentration range of the solvent polymeric sensors as well as their selectivity coefficients [38][39][40][41][42].…”

Chromium(III) Potentiometric Sensor Based on Para‐Tertiary‐Butyl Calix[4]arene

“…The response of membrane electrode depends on some parameters such as the plasticizer/PVC ratio and amount of ionophore and additive used [10][11][12][13][14][15][16]18]. Thus, the amount of membrane ingredients was optimized and the results are shown in Table 1.…”

“…Potentiometric monitoring using ion-selective electrodes offers many advantages over the above mentioned techniques such as simplicity of instrumentation, speed and ease of preparation, low cost, on-site monitoring, wide dynamic range, good selectivity and nondestructive analysis. Different ionophores have been synthesized and used for fabrication of chromium(III) ion selective electrode which include crown ethers, Schiffs bases, calixarenes and several other metal ligands and chelates [10][11][12][13][14][15][16]. Calixarenes, a class of macrocyclic compounds, are superb supramolecular building block for fabricating ion and molecular receptors.…”

Speciation of Chromium in Water Samples with Homogeneous Liquid-Liquid Extraction and Determination by Flame Atomic Absorption Spectrometry

“…Schiff's bases are well known to form strong complexes with transition metal ions and have been proposed as spectrophotometric reagents for several metal ions 32,33 and as ionophore in sensors for determining cations. 34,35 Few complexes of Schiff's bases with Cr(III) are known but Cr(VI) is unable to form complex with Schiff's bases through a ligand charge transfer between the Schiff's bases ligand (highly acceptor ligand) and Cr(VI) ion (without electron on d orbital). These compounds also have sufficient hydrophobocity to use as a complexing agent in homogeneous liquidliquid extraction.…”