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- W2037793544 abstract "Investigations of mercury adsorption and desorption on natural sodium and calcium bentonite in various buffer systems were carried out. The major component ions released from bentonite into deionized water, the volatilization of dissolved Hg°, and the influence of the pH and chloride concentration on adsorption, as well as the formation of various inorganic mercury complexes, were investigated. In deionized water, a high amount of cations and anions was released from Na bentonite. High loss of Hg was found from the buffer solution at pH 6 by escape into the atmosphere. In the pH range from 3 to 13, dissolved Hg(II) adsorbed well on bentonite as correlated with Hg(OH)2 which are the predominant species in weakly acidic to alkaline solutions. With increasing concentration of chloride ions, the uptake of Hg was reduced because of the occurence of negatively charged chloro-complexes. At pH 5.00–5.50 bentonite adsorbs Hg(II) species from the solution with a capacity of 0.32 mol/kg and follows the Langmuir model. The adsorption kinetics of mercury on bentonite depends on the solution composition and the form of the bentonite. A low adsorption rate of dissolved Hg(II) on Ca-bentonite was found at pH 8. Remobilization studies with various electrolytes are presented. Up to 80% of the adsorbed Hg on bentonite redissolves in 0.1 M hydrochloric acid." @default.
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- W2037793544 date "1994-04-01" @default.
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- W2037793544 title "Distribution of mercury between electrolyte and natural bentonite" @default.
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- W2037793544 doi "https://doi.org/10.1016/0304-4203(94)90043-4" @default.
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