Journal
ENVIRONMENTAL POLLUTION
Volume 152, Issue 3, Pages 693-701Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.envpol.2007.06.054
Keywords
kinetic extraction modeling; heavy metals; EDTA; citrate; metal mobility; soils
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Kinetic EDTA and citrate extractions were used to mimic metal mobilization in a soil contaminated by metallurgical fallout. Modeling of metal removal rates vs. time distinguished two metal pools: readily labile (Q(M1)) and less labile (Q(M2)). In citrate extractions, total extractability (Q(M1) + Q(M2)) of Zn and Cd was proportionally higher than for Ph and Cu. Proportions of Pb and Cu extracted with EDTA were three times higher than when using citrate. We observed similar Q(M1)/Q(M2) ratios for Zn and Cu regardless of the extractant, suggesting comparable binding energies to soil constituents. However, for Ph and Cd, more heterogeneous binding energies were hypothesized to explain different kinetic extraction behaviors. Proportions of citrate-labile metals were found consistent with their short-term, in-situ mobility assessed in the studied soil, i.e., metal amount released in the soil solution or extracted by cultivated plants. Kinetic EDTA extractions were hypothesized to be more predictive for long-term metal migration with depth. (c) 2007 Elsevier Ltd. All rights reserved.
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