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21.
D. R. Sharafutdinova O. B. Bazanova A. A. Murav’ev S. E. Solov’eva Z. A. Bredikhina V. M. Babaev I. S. Antipin 《Journal of Analytical Chemistry》2016,71(14):1352-1359
MALDI mass spectrometry is used for the first time for the rapid assessment of the binding of thiacalix[4]arene-monocrown-ethers with metal cations (Li, Na, K, Cs, Cu, Ag). The work is performed on examples of thiacalix[4]arene-monocrown-ethers in 1,3-alternate conformation with various numbers (m) of ethylene oxide units and various substituents in phenol groups. It is shown that thiacalix[4]arene-monocrown- ethers with m = 3, 4, 5, and 6 bind lithium, sodium, potassium, and cesium cations, respectively; in addition, the binding of cesium cations is stronger in the presence of aromatic substituents in the lower rim of thiacalix[4]arene-monocrown-ethers. Silver cations bind with calixarenes under study more intensely than copper ions. When aromatic substituents are present, the binding of silver cations is stronger than that of alkali metal ions with the studied thiacalix[4]arene-monocrown-ethers. 相似文献
22.
D. F. Pyreu M. A. Bazanova S. N. Gridchin E. V. Kozlovskii 《Russian Journal of Inorganic Chemistry》2016,61(7):909-917
The formation of mixed-ligand complexes in the M(II)–Ida–L systems (M = Cu, Ni, L = His, Orn, Lys), where Ida is the iminodiacetic acid residue, was studied by pH-metry, calorimetry, and spectrophotometry. The thermodynamic parameters (logK, ΔrG0, ΔrH, ΔrS) of formation of the complexes were determined at 298.15 K and the ionic strength I = 0.5 (KNO3). The most probable mode of coordination of the chelating agent and the amino acid in the mixed-ligand complexes was elucidated. 相似文献
23.
Yu.A. Zolotov L.K. Shpigun I.Ya. Kolotyrkina E.A. Novikov O.V. Bazanova 《Analytica chimica acta》1987
Three automated flow-injection systems are proposed for the determination of traces of manganese(II), lead and copper(II) in waters. The first system utilizes the catalytic effect of manganese(II) on the oxidation of N,N-diethylaniline by potassium periodate at pH 6.86–7.10 (30°C) and is used for spectrophotometric determination at 475 nm in the range 0.02–1.00 μg1?1; the system involves reagent injection and stopped flow. The determination of lead in the range 0.7–100 μg1?1 is based on spectrophotometric detection of the lead 4/(2-pyridylazo)resorcinol complex at 525 nm after on-line preconcentration of the sample (5–50 ml) on a minicolumn filled with Chelex-100 or Dowex 1-X8 resin. A potentiometric flow-injection system with a copper ion-selective electrode is applied for the determination of 0.5–1000 μg 1?1 copper(II) after on-line preconcentration of 50–500 ml of sample on Chelex-100 resin. The procedures are tested on synthetic and real water samples, including sea water and waste-waters. 相似文献
24.
R. A. Cherkasov A. R. Garifzyanov O. B. Bazanova S. V. Leont’eva 《Russian Journal of General Chemistry》2011,81(10):2080-2087
The processes were studied of the solvent extraction of the ions of triply-charged trace elements including scandium, indium,
gallium, and yttrium, as well as iron, with N-octyl-N,N-bis(dihexylphosphinylmethyl) amine solution in toluene, chloroform or methylene chloride from hydrochloric, nitric or perchloric
acids aqueous solutions. The metals extraction dependence on the acid concentration showed that the best results were reached
using perchloric acid. The calculation of partition coefficients of metals allowed us to reveal a high selectivity of the
scandium extraction. The prospects of using the investigated bisphosphinylamine in the technology of extraction, concentration
and separation of the trace metals ions was concluded. 相似文献