Results 171 to 180 of about 24,790 (199)
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Journal of Chromatography A, 2008
The use of aqueous polyethylene glycol-inorganic salt two-phase systems for the extraction of metal ions has a great potential due to their durability, non-toxicity and relative low cost. The aqueous phases can be easily separated by centrifugation, and the operation is possible in a range of experimental conditions. The experimental results have shown
Laura Bulgariu, Dumitru Bulgariu
exaly +3 more sources
The use of aqueous polyethylene glycol-inorganic salt two-phase systems for the extraction of metal ions has a great potential due to their durability, non-toxicity and relative low cost. The aqueous phases can be easily separated by centrifugation, and the operation is possible in a range of experimental conditions. The experimental results have shown
Laura Bulgariu, Dumitru Bulgariu
exaly +3 more sources
Talanta, 2001
Fulvic acids (FAs) were extracted by alkali extraction from different soil samples in China, then purified using resins and characterized by Fourier transform infrared spectroscopy. The complexing ability of FAs was investigated by measuring the stability constants of rare earth elements (REEs) (La(3+), Ce(3+), Sm(3+), Gd(3+), Y(3+)) with FAs by the ...
Lemei Dai, Xueyuan Gu, Jing Cheng
exaly +3 more sources
Fulvic acids (FAs) were extracted by alkali extraction from different soil samples in China, then purified using resins and characterized by Fourier transform infrared spectroscopy. The complexing ability of FAs was investigated by measuring the stability constants of rare earth elements (REEs) (La(3+), Ce(3+), Sm(3+), Gd(3+), Y(3+)) with FAs by the ...
Lemei Dai, Xueyuan Gu, Jing Cheng
exaly +3 more sources
Journal of Inorganic and Nuclear Chemistry, 1977
Abstract The activity coefficient of tri- n -octylamine (TOA) hydrochloride in benzene has been determined by a vapour pressure method and has been used in calculating the stability constants of the aqueous complexes of copper(II) and zinc(II) in hydrochloric acid solution from extraction experiments with TOA in benzene.
Taichi Sato, Toshikazu Kato
exaly +2 more sources
Abstract The activity coefficient of tri- n -octylamine (TOA) hydrochloride in benzene has been determined by a vapour pressure method and has been used in calculating the stability constants of the aqueous complexes of copper(II) and zinc(II) in hydrochloric acid solution from extraction experiments with TOA in benzene.
Taichi Sato, Toshikazu Kato
exaly +2 more sources
Hydrometallurgy, 1980
Abstract The extraction of divalent zinc, cadmium and mercury from aqueous solutions containing lithium chloride using tri-n-octylphosphine oxide (TOPO) in benzene has been investigated. By applying the trial and error method of least-squares analysis to the equilibrium equation, M2+ (aq) + 2Cl− (aq) + 2TOPO (org) ⇆ MCl2 · 2TOPO (org), for these ...
Takato Nakamura
exaly +2 more sources
Abstract The extraction of divalent zinc, cadmium and mercury from aqueous solutions containing lithium chloride using tri-n-octylphosphine oxide (TOPO) in benzene has been investigated. By applying the trial and error method of least-squares analysis to the equilibrium equation, M2+ (aq) + 2Cl− (aq) + 2TOPO (org) ⇆ MCl2 · 2TOPO (org), for these ...
Takato Nakamura
exaly +2 more sources
Separation Science and Technology, 2006
Abstract Extraction of Co(II) complexes has been studied with nine derivatives of 1‐alkyl‐4(5)‐methylimidazoles (with R=C2H3 to C10H21) from aqueous solution [I=0.5(KNO3) at 25°C] with toluene, trichloromethane, and 2‐ethyl‐1‐hexanol. Stability constants of the complexes formed in the aqueous phase (β c ) as well as partition constants (P c ) of the ...
Beniamin Lenarcik
exaly +2 more sources
Abstract Extraction of Co(II) complexes has been studied with nine derivatives of 1‐alkyl‐4(5)‐methylimidazoles (with R=C2H3 to C10H21) from aqueous solution [I=0.5(KNO3) at 25°C] with toluene, trichloromethane, and 2‐ethyl‐1‐hexanol. Stability constants of the complexes formed in the aqueous phase (β c ) as well as partition constants (P c ) of the ...
Beniamin Lenarcik
exaly +2 more sources
Extraction and stability constants of copper complexes of 1,5-diphenylcarbazone
Analytica Chimica Acta, 1966H.R. Geering, J.F. Hodgson
exaly +2 more sources
Journal of Chromatography A, 2012
This contribution presents an experimental approach for improvement of analytical performance of electromembrane extraction (EME), which is based on the use of stabilized constant d.c. electric current. Extractions were performed using a high voltage power supply, which provided stabilized constant d.c.
Andrea, Slampová +2 more
openaire +2 more sources
This contribution presents an experimental approach for improvement of analytical performance of electromembrane extraction (EME), which is based on the use of stabilized constant d.c. electric current. Extractions were performed using a high voltage power supply, which provided stabilized constant d.c.
Andrea, Slampová +2 more
openaire +2 more sources
Journal of Radioanalytical Chemistry, 1978
The complex formation of U(VI), Np(VI) and Pu(VI) with chloride ions was studied in HClO4−HCl solutions at ionic strength of 2.0 and [H+]=2.0M by the method of extraction chromatography using dilute HDEHP as the stationary phase.
L. Bednarczyk, I. Fidelis
openaire +1 more source
The complex formation of U(VI), Np(VI) and Pu(VI) with chloride ions was studied in HClO4−HCl solutions at ionic strength of 2.0 and [H+]=2.0M by the method of extraction chromatography using dilute HDEHP as the stationary phase.
L. Bednarczyk, I. Fidelis
openaire +1 more source
1984
Trace metals in the environment occur in a variety of forms in solution, in colloids and particulates. Speciation studies try to distinguish between different dissolved forms (valence state, ionic, (in)organic complexed). Speciation has become important in studies concerning transport processes and the fate of trace elements. The toxic effects of trace
Cees J. M. Kramer, Jan C. Duinker
openaire +1 more source
Trace metals in the environment occur in a variety of forms in solution, in colloids and particulates. Speciation studies try to distinguish between different dissolved forms (valence state, ionic, (in)organic complexed). Speciation has become important in studies concerning transport processes and the fate of trace elements. The toxic effects of trace
Cees J. M. Kramer, Jan C. Duinker
openaire +1 more source