Chemical associations and sorption capacity of Pb and Zn: Column experiments on a polluted soil from the Amizour mining district (Algeria)

Abstract : The column leaching behavior of lead and zinc is studied on a soil sample from the Amizour-Bejaia mining region, which is one of Algeria's largest natural reserves for Pb and Zn ores. The maximum amount of metal bound to the soil sample after column leaching by a mono-metal solution at pH 7 is 7.0 and 11.3 g/kg for Zn and Pb, respectively. These values exceed the maximum loading capacities derived from previous batch experiments conducted under similar conditions. The studied soil sample displays a stronger affinity for Pb than Zn under the study conditions. These two metals are associated with various chemical fractions of the mine soil sample, as revealed by a five-step, operationally-defined sequential chemical extraction procedure (with fractions categorized as: exchangeable, acid extractable, reducible, oxidizable, and residual) following column leaching. After metal addition and sorption, carbonates (i.e. the extractable fraction) and Fe- and/or Mn- (oxy)(hydr)oxide phases (reducible fraction) in the soil sample dominate for both Pb and Zn. The extractable fraction is mainly reserved for the purpose of zinc retention; moreover, the stabilization with Fe-Mn (oxy)(hydr)oxide phases serves as a major carrier for Pb.
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Article dans une revue
Environmental Earth Sciences, Springer, 2016, 75, article Nr. 96 (8 p.). 〈10.1007/s12665-015-4854-0〉
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https://hal-unilim.archives-ouvertes.fr/hal-01258114
Contributeur : Jean-Claude Bollinger <>
Soumis le : lundi 18 janvier 2016 - 16:22:53
Dernière modification le : vendredi 5 octobre 2018 - 22:10:08

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Lotfi Mouni, Lazhar Belkhiri, Abdelkrim Bouzaza, Jean-Claude Bollinger. Chemical associations and sorption capacity of Pb and Zn: Column experiments on a polluted soil from the Amizour mining district (Algeria). Environmental Earth Sciences, Springer, 2016, 75, article Nr. 96 (8 p.). 〈10.1007/s12665-015-4854-0〉. 〈hal-01258114〉

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