Solvent extraction of metal ions

Metal Extraction. As with other carboxyhc acids, neodecanoic acid can be used in the solvent extraction of metal ions from aqueous solutions. Recent appHcations include the extraction of zinc from river water for deterrnination by atomic absorption spectrophotometry (105), the coextraction of metals such as nickel, cobalt, and copper with iron (106), and the recovery of copper from ammoniacal leaching solutions (107). [Pg.106]

The nature of the donor atoms in the chelating agent. Ligands which contain donor atoms of the soft-base type form their most stable complexes with the relatively small group of Class B metal ions (i.e. soft acids) and are thus more selective reagents. This is illustrated by the reagent diphenylthiocarbazone (dithizone) used for the solvent extraction of metal ions such as Pd2+, Ag+, Hg2+, Cu2+, Bi3+, Pb2+, and Zn2 +. ... [Pg.164]

The solvent extraction of metal ions by crown compounds. Y. Takeda, Top. Curr. Chem., 1984,... [Pg.61]

Analytical applications of substituted cinnamohydroxamic acids in spectrophotometry and solvent extraction of metal ions. Y. K. Agrawal and R. K. Jain, Rev. Anal. Chem., 1982, 6,49-64 (71). [Pg.62]

Takeda, Y. The Solvent Extraction of Metal Ions by Grown Compounds. 121, 1-38 (1984). [Pg.186]

The catalytic role of the liquid-liquid interface in the solvent extraction of metal ions described in this chapter and some important remarks on the interfacial phenomena reported in other studies are summarized ... [Pg.377]

The major uses of non-ionizing solvents in chemical analysis are twofold. They may be used simply to provide media for the dissolution and reaction of covalent materials, or they may play a more active part in a chemical process. For example, oxygen-containing organic solvents can be used to effect the solvent extraction of metal ions from acid aqueous solutions the lone pair of electrons possessed by the oxygen atom forming a dative bond with the proton followed by the extraction of the metal ion as an association complex. [Pg.33]

Uses Plasticizer for lacquers, plastics, cellulose esters, and vinyl resins heat-exchange liquid carbonless copy paper systems in aircraft hydraulic fluids solvent extraction of metal ions from solution of reactor products uranium extraction and nuclear fuel reprocessing pigment grinding assistant antifoaming agent solvent for nitrocellulose and cellulose acetate. [Pg.1073]

Computational Chemistry in Modeling Solvent Extraction of Metal Ions... [Pg.6]

Various instruments of theoretical chemistry have been widely to describe separate steps of solvent extraction of metal ions. Because of the complexity of solvent extraction systems, there is still no unified theory and no successful approach aimed at merging the extraction steps. It has already been pointed out that the challenging problem for theoreticians dealing with solvent extraction of metals, in particular with thermodynamic calculations, is to evaluate correctly solvent effects by the use of the most accurate explicit solvation models and QM calculations. However, such calculations on extremely large sets consisting of hundreds or even thousands of molecules, necessary to model all aspects of the extraction systems, are still impossible due to both hardware and software limitations. [Pg.706]

Chan, G.Y.S., Drew, M.G.B., Hudson, M.J. et al. 1997. Solvent extraction of metal ions from nitric acid solutions using N,N -substituted malonamides. Experimental and crystallographic evidence for two mechanisms of extraction, metal complexation and ion-pair formation. J. Chem. Soc. Dalton Trans. 1997 (4) 649-660. [Pg.49]

Sekine, T. Dyrssen, D. Solvent extraction of metal ions with mixed ligands - IV. Extraction of Eu(III) with chelating acids and neutral adduct-forming ligands, J. Inorg. Nucl. Chem. 29 (1967) 1475-1480. [Pg.103]

An INTERNET compatible database for solvent extraction of metal ions (SEDATA), developed by H. Watarai et al., contains about 9,600 equilibrium constants, including distribution constants, extraction constants, and adduct formation constants, for more than 1,400 ligands and 82 metal ions.50 Raw data points of extraction curves are also incorporated to be reconstructed as a figure. However, SEDATA contains no fields for 2D chemical structures of extractants and allows one to perform a search using only eight fields (classification, metal, valence, reagent, solvent, title of the paper, author, and year). [Pg.328]

Watarai, H. Fujiwara, M. Tsukahara, S. Suzuki, N. Akiba, K. Saitoh, K. Hasegawa, Y. Kato, M. Construction of an INTERNET compatible database for solvent extraction of metal ions. Solvent Extr. Res. Dev. Jpn. 2000, 7, 197-205. [Pg.356]

Kasahara, K. and Endo, M. (2001) Solvent extraction of metal ions with acyclic and macrocyclic Schiff bases, Anal. Sci, 17(Suppl.), a339-a342. [Pg.380]

D. H. Liem On the Solvent Extraction of Metal Ions by Dialkyl Phosphoric Acid and Some Non-Acidic Complexing Agents, Stockholm 1971... [Pg.86]

Liquid-liquid systems have been most widely used in the solvent extraction of various compounds in chemical and hydrometallurgy industries. Kinetic process of solvent extraction of metal ions depends intrinsically on the mass transfer to or across the interface and the chemical reactions in both bulk phases and at the interface. Therefore, the study of the role of the interface is very... [Pg.277]

Scheme I. Interfacial mechanism of solvent extraction of metal ion (M2+).

In the solvent extraction of metal ions with carboxylic acids, it is indispensable to have information about the partition of the carboxylic acid between the aqueous and organic phases. The carboxylic acid is known to dimerize in nonsolvating solvents. [Pg.145]

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