نتایج جستجو برای: pb ii ions
تعداد نتایج: 734430 فیلتر نتایج به سال:
Pb(II) can cause serious damaging effects to human health, and thus, the study of Pb2+ detection methods to sensitively and selectively monitor Pb(II) pollution has significant importance. In this work, we have developed a label-free fluorescence sensing strategy based on a Pb(II) DNAzyme cleavage and the ThT/G-quadruplex complex. In the presence of Pb(II), a G-rich tail was cut and released fr...
the application of sulfur nanoparticles as an efficient adsorbent for the solid-phase extraction and determination of the trace amounts of pb and pd ions was investigated in environmental samples using flame atomic absorption spectrometry. effects of various parameters such as ph, flow rate of sample and eluent, type and concentration of eluent, sample volume, amount of adsorbent and interferin...
The cupferronate ions in the centrosymmetric dinuclear title compound, [Pb(2)(C(6)H(5)N(2)O(2))(4)], O,O'-chelate to the two Pb(II) atoms; two of the four nitroso O atoms are also involved in bridging. The geometries of the five-coordinate Pb(II) atoms in the two independent mol-ecules are Ψ-octa-hedral; if more remote Pb⋯O inter-actions are also considered, the coordination number is increased...
In this study, graphene Th(IV) phosphate was prepared by sol-gel precipitation method. The ion-exchange behavior of this cation-exchanger was studied by investigating properties like ion-exchange capacity for various metal ions, the effect of eluent concentration, elution behavior, and thermal effect on ion-exchange capacity (IEC). Several physicochemical properties as Fourier transform infrare...
A poly[styrene-co-(divinylbenzene)] resin (XAD-4) functionalized with 1-hydrazinophthalazine ligand has been prepared and its analytical properties investigated. The pH dependence of sorption of metal ion on the resin has been determined for Cu(II), Ni(II), Co(II), Zn(II), Cd(II), Pb(II), Fe(III) and Cr(III). Trace amounts of these metal ions were quantitatively retained on the resin and recove...
The effect of aspartic acid on the adsorption of Pb(II), Cu(II), Zn(II), Co(II), and Mn(II) on kaolinite at 25 degrees C in the presence of 5 mM KNO3 was investigated by means of potentiometric titrations and adsorption measurements over a range of pH and concentration. Data were modeled by extended constant capacitance models. Aspartic acid slightly enhanced the adsorption of Pb(II), Zn(II), a...
Nitrilotriacetic acid functionalized Adansonia digitata (NFAD) biosorbent has been synthesized using a simple and novel method. NFAD was characterized by X-ray Diffraction analysis technique (XRD), Scanning Electron Microscopy (SEM), Brunauer-Emmett-Teller (BET) surface area analyzer, Fourier Transform Infrared spectrometer (FTIR), particle size dispersion, zeta potential, elemental analysis (C...
Hyperbranched polyesters, based on 2,2-bis(hydroxymethyl)propionic acid as an ABx monomer and triethanol amine as a core molecule were synthesized and characterized with C{H} NMR spectroscopy and size exclusion chromatography. The sorption behavior of the hyperbranched polyester systems containing the oxygen ligating sites towards ions such as Cu(II), Co(II), Ni(II), Cd(II), Zn(II), Pb(II) and ...
In the title Pb(II) complex, [Pb(2)(C(2)Cl(3)O(2))(2)(NO(3))(2)(C(12)H(8)N(2))(2)](n), the 1,10-phenanthroline ligand is chelating, the nitrate anion chelates one Pb(II) ion and simultaneously bridges a neighbouring Pb(II) ion via the third O atom, and the trichloro-acetate anion is bidentate, bridging two Pb(II) ions. The coordination geometry is based on a penta-gonal-bipramidal geometry defi...
In the title coordination polymer, [Pb(C(5)H(9)NO(2)S)](n) {systematic name: catena-poly[(μ-2-amino-3-methyl-3-sulfido-butano-ato)lead(II)]}, the d-penicillaminate ligand coordin-ates to the metal ion in an N,S,O-tridentate mode. The S atom acts as a bridge to two neighbouring Pb(II) ions, thereby forming a double thiol-ate chain. Moreover, the coordinating carboxyl-ate O atom forms bridges to ...
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