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Redox-induced mobilization of copper, selenium, and zinc in deltaic soils originating from Mississippi (U.S.A.) and Nile (Egypt) River Deltas: A better understanding of biogeochemical processes for safe environmental management.
J Environ Manage. 2017 Jan 15; 186(Pt 2):131-140.JE

Abstract

Studies about the mobilization of potentially toxic elements (PTEs) in deltaic soils can be challenging, provide critical information on assessing the potential risk and fate of these elements and for sustainable management of these soils. The impact of redox potential (EH), pH, iron (Fe), manganese (Mn), sulfate (SO42-), chloride (Cl-), aliphatic dissolved organic carbon (DOC), and aromatic dissolved organic carbon (DAC) on the mobilization of copper (Cu), selenium (Se), and zinc (Zn) was studied in two soils collected from the Nile and Mississippi Rivers deltaic plains focused on increasing our understanding of the fate of these toxic elements. Soils were exposed to a range of redox conditions stepwise from reducing to oxidizing soil conditions using an automated biogeochemical microcosm apparatus. Concentrations of DOC and Fe were high under reducing conditions as compared to oxidizing conditions in both soils. The proportion of DAC in relation to DOC in solution (aromaticity) was high in the Nile Delta soil (NDS) and low in the Mississippi Delta soil (MDS) under oxidizing conditions. Mobilization of Cu was low under reducing conditions in both soils which was likely caused by sulfide precipitation and as a result of reduction of Cu2+ to Cu1+. Mobilization of Se was high under low EH in both soils. Release of Se was positively correlated with DOC, Fe, Mn, and SO42- in the NDS, and with Fe in the MDS. Mobilization of Zn showed negative correlations with EH and pH in the NDS while these correlations were non-significant in the MDS. The release dynamics of dissolved Zn could be governed mainly by the chemistry of Fe and Mn in the NDS and by the chemistry of Mn in the MDS. Our findings suggest that a release of Se and Zn occurs under anaerobic conditions, while aerobic conditions favor the release of Cu in both soils. In conclusion, the release of Cu, Se, and Zn under different reducing and oxidizing conditions in deltaic wetland soils should be taken into account due to increased mobilization and the potential environmental risks associated with food security in utilizing these soils for flooded agricultural and fisheries systems.

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Publisher Full Text (DOI)

Authors+Show Affiliations

Shaheen SM
University of Kafrelsheikh, Faculty of Agriculture, Department of Soil and Water Sciences, 33 516 Kafr El-Sheikh, Egypt; University of Wuppertal, Soil- and Groundwater-Management, Pauluskirchstraβe 7, 42285 Wuppertal, Germany. Electronic address: smshaheen@agr.kfs.edu.eg.
Frohne T
University of Wuppertal, Soil- and Groundwater-Management, Pauluskirchstraβe 7, 42285 Wuppertal, Germany; University of Bielefeld, Department I: Planning and Controlling, Universitätsstraβe 25, 33615 Bielefeld, Germany. Electronic address: t_frohne@yahoo.de.
White JR
Louisiana State University, Department of Oceanography and Coastal Sciences, College of the Coast and Environment, 3239 Energy, Coast and Environment Building, Wetland & Aquatic Biogeochemistry Laboratory, Baton Rouge, LA 70803, USA. Electronic address: jrwhite@lsu.edu.
DeLaune RD
Louisiana State University, Department of Oceanography and Coastal Sciences, College of the Coast and Environment, 3239 Energy, Coast and Environment Building, Wetland & Aquatic Biogeochemistry Laboratory, Baton Rouge, LA 70803, USA. Electronic address: rdelaun@lsu.edu.
Rinklebe J
University of Wuppertal, Soil- and Groundwater-Management, Pauluskirchstraβe 7, 42285 Wuppertal, Germany. Electronic address: rinklebe@uni-wuppertal.de.

MeSH

CopperEgyptIronManganeseMississippiOxidation-ReductionRiversSeleniumSoilSoil PollutantsWetlandsZinc

Pub Type(s)

Journal Article

Language

eng

PubMed ID

27240716

Citation

Shaheen, Sabry M., et al. "Redox-induced Mobilization of Copper, Selenium, and Zinc in Deltaic Soils Originating From Mississippi (U.S.A.) and Nile (Egypt) River Deltas: a Better Understanding of Biogeochemical Processes for Safe Environmental Management." Journal of Environmental Management, vol. 186, no. Pt 2, 2017, pp. 131-140.
Shaheen SM, Frohne T, White JR, et al. Redox-induced mobilization of copper, selenium, and zinc in deltaic soils originating from Mississippi (U.S.A.) and Nile (Egypt) River Deltas: A better understanding of biogeochemical processes for safe environmental management. J Environ Manage. 2017;186(Pt 2):131-140.
Shaheen, S. M., Frohne, T., White, J. R., DeLaune, R. D., & Rinklebe, J. (2017). Redox-induced mobilization of copper, selenium, and zinc in deltaic soils originating from Mississippi (U.S.A.) and Nile (Egypt) River Deltas: A better understanding of biogeochemical processes for safe environmental management. Journal of Environmental Management, 186(Pt 2), 131-140. https://doi.org/10.1016/j.jenvman.2016.05.032
Shaheen SM, et al. Redox-induced Mobilization of Copper, Selenium, and Zinc in Deltaic Soils Originating From Mississippi (U.S.A.) and Nile (Egypt) River Deltas: a Better Understanding of Biogeochemical Processes for Safe Environmental Management. J Environ Manage. 2017 Jan 15;186(Pt 2):131-140. PubMed PMID: 27240716.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Redox-induced mobilization of copper, selenium, and zinc in deltaic soils originating from Mississippi (U.S.A.) and Nile (Egypt) River Deltas: A better understanding of biogeochemical processes for safe environmental management. AU - Shaheen,Sabry M, AU - Frohne,Tina, AU - White,John R, AU - DeLaune,Ron D, AU - Rinklebe,Jörg, Y1 - 2016/05/27/ PY - 2015/12/27/received PY - 2016/05/13/revised PY - 2016/05/13/accepted PY - 2016/6/1/pubmed PY - 2017/3/14/medline PY - 2016/6/1/entrez KW - Floodplain soils KW - Potentially toxic elements KW - Redox chemistry KW - Specific UV absorbance (SUVA) KW - Wax Lake Delta SP - 131 EP - 140 JF - Journal of environmental management JO - J Environ Manage VL - 186 IS - Pt 2 N2 - Studies about the mobilization of potentially toxic elements (PTEs) in deltaic soils can be challenging, provide critical information on assessing the potential risk and fate of these elements and for sustainable management of these soils. The impact of redox potential (EH), pH, iron (Fe), manganese (Mn), sulfate (SO42-), chloride (Cl-), aliphatic dissolved organic carbon (DOC), and aromatic dissolved organic carbon (DAC) on the mobilization of copper (Cu), selenium (Se), and zinc (Zn) was studied in two soils collected from the Nile and Mississippi Rivers deltaic plains focused on increasing our understanding of the fate of these toxic elements. Soils were exposed to a range of redox conditions stepwise from reducing to oxidizing soil conditions using an automated biogeochemical microcosm apparatus. Concentrations of DOC and Fe were high under reducing conditions as compared to oxidizing conditions in both soils. The proportion of DAC in relation to DOC in solution (aromaticity) was high in the Nile Delta soil (NDS) and low in the Mississippi Delta soil (MDS) under oxidizing conditions. Mobilization of Cu was low under reducing conditions in both soils which was likely caused by sulfide precipitation and as a result of reduction of Cu2+ to Cu1+. Mobilization of Se was high under low EH in both soils. Release of Se was positively correlated with DOC, Fe, Mn, and SO42- in the NDS, and with Fe in the MDS. Mobilization of Zn showed negative correlations with EH and pH in the NDS while these correlations were non-significant in the MDS. The release dynamics of dissolved Zn could be governed mainly by the chemistry of Fe and Mn in the NDS and by the chemistry of Mn in the MDS. Our findings suggest that a release of Se and Zn occurs under anaerobic conditions, while aerobic conditions favor the release of Cu in both soils. In conclusion, the release of Cu, Se, and Zn under different reducing and oxidizing conditions in deltaic wetland soils should be taken into account due to increased mobilization and the potential environmental risks associated with food security in utilizing these soils for flooded agricultural and fisheries systems. SN - 1095-8630 UR - https://www.unboundmedicine.com/medline/citation/27240716/Redox_induced_mobilization_of_copper_selenium_and_zinc_in_deltaic_soils_originating_from_Mississippi__U_S_A___and_Nile__Egypt__River_Deltas:_A_better_understanding_of_biogeochemical_processes_for_safe_environmental_management_ DB - PRIME DP - Unbound Medicine ER -