Solvation of thiocyanate complexes of mercury(II) by 2-hexylpyridine from aqueous mineral acid solutions |
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Authors: | Shamas-ud-zuha M Ejaz |
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Institution: | (1) Nuclear Chemistry Division, Pakistan Institute of Nuclear Science and Technology, P.O. Nilore, Rawalpindi, (Pakistan) |
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Abstract: | The extraction of trace amounts of mercury(II) by 2-hexylpyridine dissolved in benzene from aqueous mineral acid solutions
has been studied. The replacement of chloride, nitrate and sulfate ions by the potentially ambidentate, linear and less basic
thiocyanate group offers interestingly high extraction coefficients. The value of the distribution coefficients may be lowered
by complexing mercury with oxalate, thiosulfate, acetate or citrate ions in the aqueous phase. The possible mechanism of extraction
has been discussed in the light of the results of extraction isotherms and slope analysis data. Distribution coefficients
and separation factors of several metal ions relative to mercury(II) are reported for the three mineral acid systems and the
possible removal of mercury along with some other inorganic pollutants from aqueous solutions is suggested. |
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