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Assessment of Trace Metals Contamination, Species Distribution and Mobility in River Sediments Using EDTA Extraction
Summary
Researchers investigated the effectiveness of EDTA extraction for removing trace metals (Zn, Cd, Cu, Pb) from river sediments and its effect on metal speciation across fractions. They found that increasing EDTA concentration, extraction multiplicity, and contact time all improved metal removal efficiency, while EDTA also caused metal redistribution between fractions beyond the bioavailable pool.
The impact of the ethylenediaminetetraacetic acid (EDTA) on speciation image of selected trace metals (Zn, Cd, Cu, Pb) in bottom sediments was determined. The influence on the effectiveness of metal removal of extraction multiplicity, type of metal, extraction time and concentration of EDTA were analyzed. With the increase of extraction multiplicity, the concentration of EDTA and contact time, the efficiency of trace metals leaching increased. The speciation analysis revealed that EDTA not only leached metals from bioavailable fractions, but also caused the transition of the metals between the fractions. The biggest amounts of bioavailable forms were found for Cd, less for Zn. The amount of bioavailable fraction was the lowest for Cu and Pb. The two first-order kinetic models fitted well the kinetics of metals extraction with EDTA, allowing the metals fractionation into "labile" (Q<sub>1</sub>), "moderately labile" (Q<sub>2</sub>) and "not extractable" fractions (Q<sub>3</sub>).
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