Solvent-extraction systems for

Organ oselenium compounds, such as phosphine selenides, are being evaluated in solvent extraction systems for silver and gold (63). Also, potential pharmaceuticals containing selenium have been prepared (64). 

These equations do not provide complete definition of the reactions that may be of significance in particular solvent extraction systems. For example, HTTA can exist as a keto, an enol, and a keto-hydrate species. The metal combines with the enol form, which usually is the dominant one in organic solvents (e.g., K = [HTTA]en i/[HTTA]]jet = 6 in wet benzene). The kinetics of the keto -> enol reaction are not fast although it seems to be catalyzed by the presence of a reagent such as TBP or TOPO. Such reagents react with the enol form in drier solvents but cannot compete with water in wetter ones. HTTA TBP and TBP H2O species also are present in these synergistic systems. However, if extraction into only one solvent (e.g., benzene) is considered, these effects are constant and need not be considered in a simple analysis. 

Decontaksolv is a mobile autoclave/solvent extraction system for decommissioning polychlorinated biphenyl (PCB) contaminated equipment. Decontaksolv was developed and commercialized by Sanexen Environmental Services, Inc., in Canada in the 1980s. From 1985 to 1994 it was used to decontaminate 3 million kilograms of PCB-contaminated equipment. 

F. Smedes, J.C. Kraak and H. Poppe, Simple and fast solvent extraction system for selective and quantitative isolation of adrenaline, noradrenaline and dopamine from plasma and urine, J. Chromatogr., 231, 25-39 (1982). 

Describe two principal solvent extraction systems for metal ions. Give examples of each. 

Interfacial catalysis in the solvent-extraction system for metal ions, and, in particular, in an oil/water system, is described in this chapter and some important features of the interfacial catalysis are remarked ... 

Richter, B. E., J. L. Ezzell, D. Felix, K. A. Roberts, and D. W. Later. 1995. An Accelerated Solvent Extraction System for the Rapid Preparation of Environmental Organic Compotmds in Soil, American Laboratory, vol. 7, pp. 24-28. 

Lee SL, Nam K, Kim MS, Jun SW, Park J-S, Woo JS, Hwang S-J (2005) Preparation and characterization of solid dispersions of itraconazole by using aerosol solvent extraction system for improvement in drug solubility and bioavaUabUity. Arch Pharm Res 28 866-874 Leuner C, Dressman J (2000) Improving drug solubdity for oral delivery using solid dispersions. Eur J Pharm Biopharm 50 47-60... 

Submicro Sampling and Solvent Extraction System for Rapid Gas Chromatographic Determination of Blood Alcohol... 

R.H. Atallah, G.D. Christian, S.D. Hartenstein, Continuous flow solvent extraction system for the determination of trace amounts of uranium in nuclear waste reprocessing solutions. Analyst 113 (1988)... 

A technique of microchip chemistry was introduced into an on-line solvent extraction system for the future study of superheavy elements by Ooe et al. [137]. Microchips made of glass plates have microscale ditches of typically 1-100 pm in width and depth. Because of a large specific interfacial area and a short diffusion length of solutes, chemical equilibria are rapidly achieved in the microspace, which is suited to the chemical separation of short-lived nuclides. On-line solvent... 

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