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Lead isotope ratios in a soil from a coal carbonization plant

AutorDíaz Somoano, Mercedes ; Calvo Díez, Montserrat ; López Antón, María Antonia ; Suárez Ruiz, Isabel ; García Fernández, Roberto ; Rodríguez Moinelo, Sabino J. ; Martínez Tarazona, María Rosa
Palabras claveLead isotope ratio
Coal carbonization plant
Fecha de publicaciónmay-2007
CitaciónFuel 86(7-8): 1079-1085 (2007)
ResumenIn the present work, lead isotope ratios were used to ascertain the enhancement of lead concentration in a soil derived from an experimental coking plant that processed 30 tons of coal per day over a period of 30 years. Isotope ratios were also used in this work to evaluate whether lead originated by this industrial activity may be leached and transported deep into the soil. It was found that variation in Pb concentrations in soil samples from the A Horizon, at various distances (7–35 m) from the coking battery, ranged between 17 and 349 μg g−1, whereas in samples taken 50 m away, the concentration was less than 34 μg g−1. This implies that all the operations involved in coal carbonization are responsible for the increase in the total amount of Pb in the thin top layer of the soil, although the concentration of lead was lower than the intervention limit values established for contaminated soils by Dutch Standards (530 μg g−1). To establish the origin of pollution in this soil, lead isotope ratios of samples taken at different points were determined. The relationships between Pb-206/Pb-204 and Pb-207/Pb-204 indicated a mixture of natural and anthropogenic Pb. Although lead from industrial activity is present in the thin top layer, its presence decreased drastically between 0 and 30 cm depth.
Descripción7 pages, 5 figures, 3 tables.-- Available online 21 November 2006.
Versión del editorhttp://dx.doi.org/10.1016/j.fuel.2006.10.015
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