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  • 1 Royal Institute of Technology Department of Inorganic Chemistry S-100 44 Stockholm 70 (Sweden)
  • | 2 Higher Institute of Chemical Technology Department of Nonferrous Metallurgy 56 Sofia Bulgaria
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The extraction of tracer mercury(II) from aqueous HCl-solutions by TLA (trilaurylamine) dissolved in benzene can simply be described by the reaction

\documentclass{aastex} \usepackage{amsbsy} \usepackage{amsfonts} \usepackage{amssymb} \usepackage{bm} \usepackage{mathrsfs} \usepackage{pifont} \usepackage{stmaryrd} \usepackage{textcomp} \usepackage{upgreek} \usepackage{portland,xspace} \usepackage{amsmath,amsxtra} \pagestyle{empty} \DeclareMathSizes{10}{9}{7}{6} \begin{document} $$TLAHCl \cdot H_2 O(org) + HgCl_2 (aq) \rightleftharpoons TLAHCl \cdot HgCl_2 (org) + H_2 O(aq)$$ \end{document}
((1)) Using the chloride ion activity coefficient function recently introduced by HÖGFELDT
\documentclass{aastex} \usepackage{amsbsy} \usepackage{amsfonts} \usepackage{amssymb} \usepackage{bm} \usepackage{mathrsfs} \usepackage{pifont} \usepackage{stmaryrd} \usepackage{textcomp} \usepackage{upgreek} \usepackage{portland,xspace} \usepackage{amsmath,amsxtra} \pagestyle{empty} \DeclareMathSizes{10}{9}{7}{6} \begin{document} $$\lg y_{Cl^ - } = - 0.5115 \sqrt I /(1 + 1.176 \sqrt I ) - \lg C_{corr}$$ \end{document}
together with the model for excess acid extraction developed by AGUILAR and HÖGFELDT, the only unknown quantity is the equilibrium constant for the reaction above since the stability constants for the formation of the Hg(II)-CT-complexes are also well known. Using distribution data for HgCl2 (tracer) between HCl-solutions and benzene Eq. (2) gets further support as being a useful expression for the activity coefficient of Cl in solutions more concentrated than ≈0.6M. Some scouting experiments about the extraction of HgCl2 from NaCl brines containing 270 g NaCl/l showed that in the pH-range 1–13 the best extraction was obtained at about pH 1–2 irrespective if the diluent was benzene, o-xylene or a mixture of kerosene and benzene.