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Monitoring the effects of chelating agents and electrical fields on active forms of Pb and Zn in contaminated soil

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Abstract

The application of electrical fields and chelating agents is an innovative hybrid technology used for the decontamination of soil polluted by heavy metals. The effects of four center-oriented electrical fields and chelating agents on active fractions of lead and zinc were investigated in this pot experiment. Ethylenediaminetetraacetic acid (EDTA) as a synthetic chelator and cow manure extract (CME) and poultry manure extract (PME) as natural chelators were applied to the pots (2 g kg−1) 30 days after the first irrigation. Two weeks later, four center-oriented electrical fields were applied in each pot (in three levels of 0, 10, and 30 V) for 1 h each day for 14 days. The soil near the cathode and anodes was collected and analyzed as cathodic and anodic soil, respectively. Results indicated that the soluble–exchangeable fraction of lead and zinc were decreased in the cathodic soil, while the carbonate-bound fractions were increased. In the anodic soil, however, the opposite result was observed. EDTA enhanced the soluble–exchangeable form of the metals in both anodic and cathodic soils. Furthermore, the amounts of carbonate-bound heavy metals were increased by the application of CME in both soils. The organic-bound fraction of the metals was increased by the application of natural chelators, while electrical fields had no significant impacts on this fraction.

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Authors and Affiliations

  1. Department of soil science, Bu-Ali Sina University, Hamadan, Iran

    Iman Tahmasbian & Ali Akbar Safari Sinegani

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  1. Iman Tahmasbian
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  2. Ali Akbar Safari Sinegani
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Correspondence to Iman Tahmasbian.

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Tahmasbian, I., Safari Sinegani, A.A. Monitoring the effects of chelating agents and electrical fields on active forms of Pb and Zn in contaminated soil. Environ Monit Assess 185, 8847–8860 (2013). https://doi.org/10.1007/s10661-013-3217-0

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