Etude des eaux thermominérales carbogazeuses du Massif Central Français. II. Comportement de quelques métaux en trace, de l'arsenic, de l'antimoine et du germanium

Details Etude des eaux thermominérales carbogazeuses du Massif Central Français. II. Comportement de quelques métaux en trace, de l'arsenic, de l'antimoine et du germanium Etude des eaux thermominérales carbogazeuses du Massif Central Français. II. Comportement de quelques métaux en trace, de l'arsenic, de l'antimoine et du germanium

Aug 1986

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986gecoa..50.1573c&link_type=abstract

Geochimica et Cosmochimica Acta, vol. 50, Issue 8, pp.1573-1582

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Scientific paper

CO 2 rich spring waters were sampled and analyzed for Co, Ni, Cu, Pb, Zn, Cd, Cr, As, Sb and Ge by graphite furnace atomic absorption spectroscopy. The springs belong to two groups corresponding to possible events which may occur during the ascent of a thermomineral water: cooling without major modification of the mineralization (Vichy springs) or mixing at constant temperature (Vals les Bains springs). The implications of these phenomena on the trace element behavior are presented. Because of changes in pH, temperature, mineralization and redox conditions, water-rock interactions increase and the new conditions allow higher concentrations of metals than in the deep fluid. The calculated distribution of aqueous species indicates the importance of bicarbonate complexes in the transport of divalent metals. The total dissolved concentrations are limited by the solubility of carbonates or the adsorption on ferric hydroxydes. On the contrary, As, Sb and Ge are dissolved under hydrothermal conditions and their concentrations tend to decrease when the deep fluid cools down or mixes with superficial water. The behavior of Ge seems to differ from that of silica, and the influence of the oxidation state is demonstrated for As and Sb. These last two elements are involved with precipitations of clay minerals, silica or ferric hydroxydes.

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