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Article Dans Une Revue Environmental Geology Année : 2008

Origin of nickel in water solution of the chalk aquifer in the north of France and influence of geochemical factors

Daniel Bernard
  • Fonction : Auteur
Jamal El Khattabi
Emilie Lefèvre
  • Fonction : Auteur
Hani Serhal
  • Fonction : Auteur
Sabine Bastin-Lacherez
  • Fonction : Auteur

Résumé

In the north of France, high registers of nickel are sometimes recorded within the chalk aquifer. In a confined context, the presence of pyrite in the covering clays or in the marcasite nodules encrusted in the clay may constitute a natural source of trace metals. With an objective of sanitary control, the limits of chemical contents regulating the quality of water destined for human consumption have been lowered by the European Framework Directive in the field of water policy (2000/60/EC). As a result, nickel limits have been reduced from 50 to 20 μg/l. The analyses, carried out on three water catchment fields in our area of study, were centred on variable parameters (Eh, O2(d), pH, Conductivity, T°), major elements (SO4, NO3) and metals (Fe, Ni, Mn, Co). The acquired data enabled us to identify from one hand, the conditions which are presented within the site, special thanks to the evolution of nitrate and iron contents and on the other hand, the natural origin (geological) of nickel for two of the three sites studied based essentially on the evaluation of the Nickel/Cobalt ratio. Thus, on the first site, the evolution of nickel content and nitrate content showed the influence of the phenomenon of denitrification on the re-mobilisation of the nickel. Whereas on the second site, a high variation of total iron content and oxygen dissolved in solution highlighted a particular phenomenon of oxidation of the pyrite through molecular oxygen. Finally, the correlation with the sulphates clearly showed behaviour of the nickel, once released, that was entirely dependent on the phenomenon of adsorption on the iron and manganese hydroxides.

Dates et versions

hal-00304326 , version 1 (22-07-2008)

Identifiants

Citer

Daniel Bernard, Jamal El Khattabi, Emilie Lefèvre, Hani Serhal, Sabine Bastin-Lacherez, et al.. Origin of nickel in water solution of the chalk aquifer in the north of France and influence of geochemical factors. Environmental Geology, 2008, 53 (5), pp.1129-1138. ⟨10.1007/s00254-007-0704-z⟩. ⟨hal-00304326⟩

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