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Various Metal Ions (various + metal_ion)

Distribution by Scientific Domains
Chemistry60%
Polymers and Materials Science40%

Selected Abstracts

Selective Electrochemical Analysis of Various Metal Ions at an EDTA Bonded Conducting Polymer Modified Electrode

ELECTROANALYSIS, Issue 16 2004
Aminur Rahman
Abstract An EDTA-bonded conducting polymer modified electrode was prepared and characterized by FT-IR. The modified electrode was used for the selective electrochemical analysis of various trace metal ions such as, Cu(II), Hg(II), Pb(II), Co(II), Ni(II), Fe(II), Cd(II), and Zn(II) at the different pHs by linear sweep and square wave voltammetry. Dynamic ranges were obtained using square wave voltammetry from 0.1,,M to 10.0,,M for Co(II), Ni(II), Cd(II), Fe(II), and Zn(II) and 0.5,nM to 20,nM for Cu(II), Hg(II), and Pb(II) after 10,min of preconcentration. The detection limits were determined to be 0.1,nM, 0.3,nM, 0.4,nM, 50.0,nM, 60.0,nM, 65.0,nM, 80.0,nM, and 90.0,nM for Cu(II), Hg(II), Pb(II), Co(II), Ni(II), Cd(II), Fe(II), and Zn(II), respectively. The technique offers an excellent way for the selective trace determination of various heavy metal ions in a solution. [source]

Sorption properties of the iminodiacetate ion exchange resin, amberlite IRC-718, toward divalent metal ions

JOURNAL OF APPLIED POLYMER SCIENCE, Issue 2 2008
Charef Noureddine
Abstract The sorption properties of the commercially available cationic exchange resin, Amberlite IRC-718, that has the iminodiacetic acid functionality, toward the divalent metal-ions, Fe2+, Cu2+, Zn2+, and Ni2+ were investigated by a batch equilibration technique at 25°C as a function of contact time, metal ion concentration, mass of resin used, and pH. Results of the study revealed that the resin exhibited higher capacities and a more pronounced adsorption toward Fe2+ and that the metal-ion uptake follows the order: Fe2+ > Cu2+> Zn2+ >Ni2+. The adsorption and binding capacity of the resin toward the various metal ions investigated are discussed. © 2007 Wiley Periodicals, Inc. J Appl Polym Sci, 2008 [source]

Polymer-based fluorescence sensors incorporating chiral binaphthyl and benzo[2,1,3]thiadiazole moieties for Hg2+ detection

JOURNAL OF POLYMER SCIENCE (IN TWO SECTIONS), Issue 5 2010
Xiaobo Huang
Abstract Three chiral polymers P-1, P-2, and P-3 could be obtained by the polymerization of (R)-6,6,-dibutyl-3,3,-diiodo-2, 2,-binaphthol (R -M-1), (R)-6,6,-dibutyl-3,3,-diiodo-2,2,-bisoctoxy-1,1,-binaphthyl (R -M-2), and (R)-6,6,-dibutyl-3,3,-diiodo-2,2,-bis (diethylaminoethoxy)-1,1,-binaphthyl (R -M-3) with 4,7-diethynyl-benzo[2,1,3]-thiadiazole (M-1) via Pd-catalyzed Sonogashira reaction, respectively. P-1, P-2, and P-3 can show pale red, blue,green, and orange fluorescence. The responsive optical properties of these polymers on various metal ions were investigated by fluorescence spectra. Compared with other cations, such as Co2+, Ni2+, Ag+, Cd2+, Cu2+, and Zn2+, Hg2+ can exhibit the most pronounced fluorescence response of these polymers. P-1 and P-2 show obvious fluorescence quenching effect upon addition of Hg2+, on the contrary, P-3 shows fluorescence enhancement. Three polymer-based fluorescent sensors also show excellent fluorescence response for Hg2+ detection without interference from other metal ions. The results indicate that these kinds of tunable chiral polybinaphthyls can be used as fluorescence sensors for Hg2+ detection. © 2010 Wiley Periodicals, Inc. J Polym Sci Part A: Polym Chem 48: 997,1006, 2010 [source]

Probing the supramolecular interaction synthons of 1-benzofuran-2,3-dicarboxylic acid in its monoanionic form

ACTA CRYSTALLOGRAPHICA SECTION C, Issue 1 2009
Rajesh Koner
1-Benzofuran-2,3-dicarboxylic acid (C10H6O5) is a dicarboxylic acid ligand which can readily engage in organometallic complexes with various metal ions. This ligand is characterized by an intramolecular hydrogen bond between the two carboxyl residues, and, as a monoanionic species, readily forms supramolecular adducts with different organic and inorganic cations. These are a 1:1 adduct with the dimethylammonium cation, namely dimethylammonium 3-carboxy-1-benzofuran-2-carboxylate, C2H8N+·C10H5O5,, (I), a 2:1 complex with Cu2+ ions in which four neutral imidazole molecules also coordinate the metal atom, namely bis(3-carboxy-1-benzofuran-2-carboxylato-,O3)tetrakis(1H -imidazole-,N3)copper(II), [Cu(C10H5O5)2(C3H4N2)4], (II), and a 4:1 adduct with [La(H2O)7]3+ ions, namely heptaaquabis(3-carboxy-1-benzofuran-2-carboxylato-,O3)lanthanum 3-carboxy-1-benzofuran-2-carboxylate 1-benzofuran-2,3-dicarboxylic acid solvate tetrahydrate, [La(C10H5O5)2(H2O)7](C10H5O5)·C10H6O5·4H2O, (III). In the crystal structure, complex (II) resides on inversion centres, while complex (III) resides on axes of twofold rotation. The crystal packing in all three structures reveals ,,, stacking interactions between the planar aromatic benzofuran residues, as well as hydrogen bonding between the components. The significance of this study lies in the first crystallographic characterization of the title framework, which consistently exhibits the presence of an intramolecular hydrogen bond and a consequent monoanionic-only nature. It shows further that the anion can coordinate readily to metal cations as a ligand, as well as acting as a monovalent counter-ion. Finally, the aromaticity of the flat benzofuran residue provides an additional supramolecular synthon that directs and facilitates the crystal packing of compounds (I),(III). [source]

High Sensibility of Quantum Dots to Metal Ions Inspired by Hydroxyapatite Microbeads

CHINESE JOURNAL OF CHEMISTRY, Issue 6 2010
Xiang Wang
Abstract An approach for the sensitive and selective determination of Ag+, Cu2+ and Hg2+ ions was developed based on the fluorescence quenching of mercaptopropionic acid (MPA) capped CdTe quantum dots in the existence of hydroxyapatite (HAP) nanoribbon spherulites. Among various metal ions investigated, it was found that the fluorescence of CdTe QDs was only sensitive to Ag+, Cu2+ and Hg2+ ions. The addition of HAP into the CdTe system could bring forward a sensitivity improvement of about 1 to 2 orders of magnitude in the detection of Ag+ and Cu2+ compared with the plain CdTe system without the existence of HAP; while there was no sensitization effect for Hg2+. Under optimal conditions, the detection limits for Ag+, Cu2+ and Hg2+ were 20, 56 and 3.0 nmol·L,1, respectively, and the linear ranges were 0.02,50, 0.056,54 and 0.003,2.4 µmol·L,1, respectively. Mechanisms of both QDs fluorescence quenching by metal ions and the sensitization effect by HAP were also discussed. [source]