Solvent Extraction of Mercury(II) from Hydrochloric Acid with 1,2-Bis(hexylthio)ethane

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Abstract
Solvent extraction of mercury(II) from hydrochloric acid with 1,2-bis(hexylthio)ethane (=BHTE=\barS) in 1,2-dichloroethane has been studied at 30 °C. Mercury(II) was found to be extracted into pure 1,2-dichloroethane without extractants, which is due to the physical partition of the neutral species, HgCl2. The partition coefficient, KD, was evaluated as KD=0.314. It was clarified that the extraction mechanism with BHTE can be explained in terms of solvation by BHTE and that 1:1 metal: the ligand complex is formed in the organic phase as follows. \barS+HgCl2\ightleftharpoons‾HgCl2·S Ke The extraction equilibrium constant, Ke, was evaluated as Ke=1.61×103 dm3 mol−1.

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