Hg²⁺‐Selective Membrane Potentiometric Sensor Based on a Recently Synthesized Mercapto Compound

Abstract

A new PVC membrane electrode for Hg(II) ion based on a recently synthesized mercapto compound of 2-benzoylamino-3-(4-chloro-phenyl)-thioacrylic acid S-(2-mercapto-4-methyl-phenyl) ester is reported. The electrode exhibits a Nernstian response for Hg 2 ions over a wide concentration range (2.0 Â 10 À7 ± 3.0 Â 10 À2 M) with a slope of 29 (AE 1). The limit of detection is 5.0 Â 10 À8 M. The proposed sensor revealed good selectivities over a wide variety of other cations include hard and soft metals. This electrode could be used in a pH range of 1.0 ± 4.0. It was used as an indicator electrode in potentiometric titration of mercury(II) ions and can be used in the direct determination of Hg 2 in aqueous solutions.

One decade of research on ion-selective electrodes in Iran (1996–2006)

“…Other transition metal ion selective electrodes include [1,1'-bicyclohexyl]-1,1',2,2'-tetrol [135], tetrathia-12-crown-4 [136], 5-[((4-methylphenyl)azo)-N-(6-amino-2-pyridin) salicylaldimine] [137] and 5-[((4-methylphenyl)azo)-N-(2-diamino-2-cyano-1-ethyl cyanide) salicylaldehyde] [137], and N'-[1-(2-furyl)methylidene]-2-furohydrazide based PMEs for Cd 2+ [135][136][137][138] and Hg 2+ ions [139][140][141][142][143].…”

Used gold nano-particles as an on/off switch for response of a potentiometric sensor to Al(III) or Cu(II) metal ions

“…In many reports the ligands with hard donor atoms (include the hydroxide and oxo anions, the phenolate side chains of ligands, phosphate groups, alkoxide groups (e.g., citrate, sugars), and carboxylate groups) were used as ionophore for hard ions such as K + , Al 3+ and Na + , on the other hand [14][15][16][17][18], the ligands with soft donor atoms (for example with S atoms) were used as ionophore for soft ions such as Ag + , Hg 2+ , Cd 2+ and Cu 2+ [19][20][21][22].…”

Solvent Extraction of Gold(I) Directly from Alkaline Cyanide Solution with Dibutyl Sulfoxide and n-Octanol

“…[7][8][9][10][11][12] In summary, only a few applicable systems were used to directly extract gold from alkaline cyanide solutions, including amines, modified amines, guanidine, substituted guanidine, sulfoxide category materials, as well as crown ethers. [11,[13][14][15][16][17][18] Of these systems, quaternary ammonium salts, such as CTAB (cetyltrimethylammonium bromide), are considered as the most promising agents to extract gold directly from alkaline cyanide solution. However, although Au(CN) 2 -can be effectively extracted by water-soluble quaternary ammonium salts, it is very difficult to strip it out of the organic phase due to its' strong interaction with Au(CN) 2 -, [8] which heavily restricts this technology being industrially applied for gold production.…”