Geochemistry and Behavior of Trace Elements During the Complete Evaporation of the Merouane Chott Ephemeral Lake: Southeast Algeria |
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| Authors: | Messaoud Hacini Eric H Oelkers |
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| Institution: | 1.Laboratoire de Biogéochimie des Milieux Désertiques,Université Kasdi Merbah de Ouargla,Ouargla,Algeria;2.Géochimie et Biogéochimie Experimentale,CNRS UMR 5563-Universtié Paul Sabatier,Toulouse,France |
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| Abstract: | The Merouane Chott, located in arid southeastern Algeria, experiences annual cycles of filling from September through February
followed by its complete evaporation from February through June. The concentration of 15 trace elements (Li, B, Ti; V, Cr,
Mn, Co, Cu, Ni, Zn, As, Sr, Ba, Pb, Bi, and U) were measured in chott water samples collected from January through June 2003
during the complete evaporation of the lake. The corresponding concentrations of these trace elements in the major external
inputs to this closed basin chott were also obtained. The trace metals show two distinct behaviors. Li, B, Cr, Co, and U tend
to be conserved in the chott waters throughout its evaporation. Much of Cr, Co, and U originated from external sources. It
is likely, therefore, that the concentration of these elements will increase in the chott waters in future years. In contrast,
Ti, Sr, Ba, Zn, Ni, and Pb precipitate continuously during chott evaporation. Of these elements, most of the Sr, Ba, and Zn
originated from outside the chott, and thus it is likely these elements will become increasingly concentrated in the chott
bottom salts with time. V, As, and Cu exhibit intermediate behaviors. These contrasting behaviors are confirmed by analysis
of chott bottom solids. |
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