Modern Extraction Mechanism of Metal Chelate

Recent research on the solvent extraction mechanism revealed that the role of liquid-liquid interface has to be taken into account for understanding the extraction mechanism, especially in the extraction kinetic mechanism. Breakthrough research has been attained with the invention of a high-speed stirring (HSS) method that made it possible to measure the interfacial concentration of extractant (Lewis base) and extraction rate of the complex. Thus, this technique could determine a rate law for the interfacial reaction for the first time [1], 

Concentration at the interface is represented in the unit of mol/cm and correlated to the bulk phase concentration by the Langmuir isotherm as discussed later. 

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