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The adsorption excretion of Hg, As, and Cu ions from aqueous solutions at 22пїЅ0.5пїЅC on zeolite (Sokirnitskoe deposit, Transcarpathia) and smectite clay (Kamalinskoye deposit, Krasnoyarsk region) were studied. The adsorption processes were studied in the static regime at pH?2. Parameters such as, the time of equilibrium establishment, the ratio "sorbent - solution" were selected experimentally. All samples were filtered through a 0.2 ?m membrane using syringes. The samples for Hg were selected strictly in teflon...

The paper concerns the geochemical trends (loss and accumulation) of trace elements studied in the lateritic weathering profile of Futa Jallon-Mandingo Province and related to weathering of silty mudstones and dolerites. Whatever their composition, structure, texture, strike, and dip the bauxite-bearing weathering mantles usually show a zoned profile consisting of two generic horizons. The lower horizon mainly consists of clays grading in the mineralogical composition from polymineralic, with fragments of slightly...