A kinetic approach to predict soil trace metal bioavailability: preliminary results |
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Authors: | A Bermond G Varrault V Sappin-Didier M Mench |
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Institution: | (1) laboratoire de chimie analytique, Institut national agronomique, 16 rue Claude Bernard, 75231 Paris Cedex 05, France;(2) Unité d’Agronomie, INRA, 33883 Villenave d’Ornon, France |
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Abstract: | The presence of large amounts of trace metals creates a hazard in some soils that is strongly related to the speciation of
these metals. The aim of this work was to apply an operationally defined fractionation based on kinetics, which could distinguish
“labile” (quickly extracted) and “non-labile” (or slowly labile i.e. slowly extracted) cations by using the extraction kinetics
of trace metals by EDTA. This kinetic fractionation was applied to 10 unpolluted soil samples from Burgundy (France) in order
to determine their labile concentrations of lead and cadmium. According to this method, cadmium was found to be more mobile
than lead, with respect to both labile concentration and the kinetic constants. Moreover, it was also found that the labile
concentration of cadmium was related (R
2=0.6) to its concentration in wheat shoots; however, no such correlation was found for lead. |
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Keywords: | bioavailability EDTA kinetics soil trace metals speciation |
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