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(W/MF184) Heavy Metals Speciation in the Guadalquivir Estuary by means of semiempiric models. Garcia-Luque, Enrique1, Forja Pajares, Jesus M.1, Gomez-Parra, Abelardo1, 1 ABSTRACT- The untreated toxic water spill coming from Aznalcollar mine has been reproduced by means of simulating techniques at the laboratory to evaluate the impact on the Guadalquivir estuary (SW Spain). If we apply the model by Turner et al. (1981) to the heavy metals concentrations measured during the simulation assays it is possible to establish the speciation of Zn, Cd, Pb and Cu. In the case of Zn the predominant chemical species along the salinity gradient are Zn2+ (like free ion) and SZnCl. The heavy metal Cd presents a clear pattern: the SCdCl percentage increases with the salinity (95% at salinity value of 30). The Pb pattern speciation in the simulation assays is similar to the pattern described by Turner et al., 1981. The predominant specie is SPb(CO3). On the other hand SCu(CO3) constitutes the dominant specie invariably along all the salinity gradient (98%) without changes with the salinity values. Key words: Heavy metals speciation, Simulation techniques, Estuaries, Aznalcollar mining spill |
