Abstract
The objectives of this study were to investigate fractionation, solubility and potential bioavailability of Pb, As and Cs in Mississippi River Delta paddy soil under an electrokinetic field (EKF). Effects of EKF on soil pH changes and solid-phase distributions of metal(loid)s were examined. Results showed that fractionation of Pb, As and Cs was largely determined by the nature of elements, loading levels and EKF treatment. Native Pb in the soil was mostly in the amorphous iron oxide, organic matter and residual fractions, native As in the amorphous iron oxide, easily reducible oxide and residue fractions while native Cs in the residue fraction. Added Pb, As and Cs showed distinguished solid-phase distributions: Pb dominantly in the organic matter fraction; As in the amorphous iron oxide fraction, and Cs in the residue with a significant water-soluble plus exchangeable fraction. EKF treatment is effective on lowering soil pH to 1.5 near the anode due to water electrolysis releasing proton which is beneficial for dissolution of metal(loid)s, increasing their overall solubility. The acidification in the anode soil efficiently increased the water-soluble Pb and the exchangeable Cs, implying enhanced solubility and elevated their overall potential bioavailability in the anode region while lower solubility in the cathode area. The building up of water-soluble As in the anode region may be from electromigration of As anion from the cathode. This study shows significant enhancement of redistribution, elevated solubility and overall bioavailability of Pb, As and Cs in Mississippi Delta paddy soil under the EKF.
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Acknowledgments
This research was supported by U.S. Nuclear Regulatory Commission (NRC-HQ-84-15-G-0042 and NRC–HQ-12-G-38-0038) and U.S. Department of Commerce (NOAA) (NA11SEC4810001-003499). Mr. Mao was also supported by China Scholarship Council, Jiangsu Scientific Research Innovation Program of Ordinary Higher Education Graduate (KYZZ0156), Special Fund for Hydro-scientific Research in the Public Interest (201301017), and the Fundamental Research Fund for the Central Universities (2014B04814 and 2015B05814).
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Abbreviations
- EKF
-
Electrokinetic field
- EKR
-
Electrokinetic remediation
- SOL
-
The water-soluble fraction
- EXC
-
The exchangeable fraction
- ERO
-
The easily reducible oxide bound fraction
- AmoFe
-
Amorphous iron oxide bound fraction
- OM
-
Organic matter bound fraction
- CryFe
-
Crystalline iron oxide bound fraction
- RES
-
Residual bound fraction
- SSD
-
Selective sequential dissolution
- ICP-MS
-
Inductively coupled plasma mass spectrometry
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Mao, X., Han, F.X., Shao, X. et al. The distribution and elevated solubility of lead, arsenic and cesium in contaminated paddy soil enhanced with the electrokinetic field. Int. J. Environ. Sci. Technol. 13, 1641–1652 (2016). https://doi.org/10.1007/s13762-016-1007-2
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DOI: https://doi.org/10.1007/s13762-016-1007-2