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Biochar affects the dissolved and colloidal concentrations of Cd, Cu, Ni, and Zn and their phytoavailability and potential mobility in a mining soil under dynamic redox-conditions.
Sci Total Environ. 2018 May 15; 624:1059-1071.ST

Abstract

There is a lack of knowledge on the effects of biochar (BC) on the release dynamics of potentially toxic elements (PTEs) in different phases of soil under systematic change of redox potential (EH). We aimed to elucidate the impact of pre-definite EH on the release dynamics of dissolved and colloidal concentrations of Cd, Cu, Ni, and Zn as well as their phytoavailability and potential mobility in the solid-phase of a mining soil treated with rice hull biochar (S+BC) compared to non-treated soil (S). The influence of EH-dependent changes of soil pH, dissolved organic carbon (DOC), dissolved aromatic carbon (DAC), Fe, Mn, SO42-, and Cl- on the elements release was also determined. The experiment was conducted stepwise from reducing (-30mV in S and -12mV in S+BC) to oxidizing (+218mV in S and +333mV in S+BC) conditions using an automated biogeochemical microcosm system. Biochar-treated soil exhibited a wider range of EH and a lower pH than the non-treated soil. Dissolved concentrations of Cd, Cu, Ni, Zn, Fe, Mn, SO42-, and DAC increased under oxic conditions in the non-treated and biochar-treated-soils, which might be due to the decline of pH, and/or sulfide oxidation. Cadmium was more abundant in the colloidal fraction, while Cu, Mn, and DOC were more abundant in the dissolved fraction. Nickel, Zn, and Fe distributed almost equally in both fractions. Biochar increased the dissolved concentration of Cd, Ni, Zn and in particular Cu under oxic conditions. However, the biochar did not significantly affect the colloidal fraction of Cd, Cu, Ni, and Zn. The phytoavailability of the studied elements was higher than the potential mobility. We conclude that increasing the dissolved concentrations of the elements under oxic conditions might increase their release and transfer into the groundwater and the food chain which should be harmful for the environment.

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Authors+Show Affiliations

El-Naggar A
Korea Biochar Research Center, O-Jeong Eco-Resilience Institute (OJERI) & Division of Environmental Science and Ecological Engineering, Korea University, Seoul 02841, Republic of Korea; School of Natural Resources and Environmental Science, Kangwon National University, Chuncheon 24341, Republic of Korea; Department of Soil Sciences, Faculty of Agriculture, Ain Shams University, Cairo 11241, Egypt. Electronic address: ali_elnaggar@agr.asu.edu.eg.
Shaheen SM
University of Kafrelsheikh, Faculty of Agriculture, Department of Soil and Water Sciences, 33516 Kafr El-Sheikh, Egypt; University of Wuppertal, School of Architecture and Civil Engineering, Institute of Foundation Engineering, Water- and Waste-Management, Laboratory of Soil- and Groundwater-Management, Pauluskirchstraβe 7, 42285 Wuppertal, Germany. Electronic address: smshaheen@agr.kfs.edu.eg.
Ok YS
Korea Biochar Research Center, O-Jeong Eco-Resilience Institute (OJERI) & Division of Environmental Science and Ecological Engineering, Korea University, Seoul 02841, Republic of Korea. Electronic address: yongsikok@korea.ac.kr.
Rinklebe J
University of Wuppertal, School of Architecture and Civil Engineering, Institute of Foundation Engineering, Water- and Waste-Management, Laboratory of Soil- and Groundwater-Management, Pauluskirchstraβe 7, 42285 Wuppertal, Germany; Department of Environment and Energy, Sejong University, Seoul 05006, Republic of Korea. Electronic address: rinklebe@uni-wuppertal.de.

Pub Type(s)

Journal Article

Language

eng

PubMed ID

29929223

Citation

El-Naggar, Ali, et al. "Biochar Affects the Dissolved and Colloidal Concentrations of Cd, Cu, Ni, and Zn and Their Phytoavailability and Potential Mobility in a Mining Soil Under Dynamic Redox-conditions." The Science of the Total Environment, vol. 624, 2018, pp. 1059-1071.
El-Naggar A, Shaheen SM, Ok YS, et al. Biochar affects the dissolved and colloidal concentrations of Cd, Cu, Ni, and Zn and their phytoavailability and potential mobility in a mining soil under dynamic redox-conditions. Sci Total Environ. 2018;624:1059-1071.
El-Naggar, A., Shaheen, S. M., Ok, Y. S., & Rinklebe, J. (2018). Biochar affects the dissolved and colloidal concentrations of Cd, Cu, Ni, and Zn and their phytoavailability and potential mobility in a mining soil under dynamic redox-conditions. The Science of the Total Environment, 624, 1059-1071. https://doi.org/10.1016/j.scitotenv.2017.12.190
El-Naggar A, et al. Biochar Affects the Dissolved and Colloidal Concentrations of Cd, Cu, Ni, and Zn and Their Phytoavailability and Potential Mobility in a Mining Soil Under Dynamic Redox-conditions. Sci Total Environ. 2018 May 15;624:1059-1071. PubMed PMID: 29929223.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Biochar affects the dissolved and colloidal concentrations of Cd, Cu, Ni, and Zn and their phytoavailability and potential mobility in a mining soil under dynamic redox-conditions. AU - El-Naggar,Ali, AU - Shaheen,Sabry M, AU - Ok,Yong Sik, AU - Rinklebe,Jörg, Y1 - 2017/12/27/ PY - 2017/10/14/received PY - 2017/12/05/revised PY - 2017/12/17/accepted PY - 2018/6/23/entrez PY - 2018/6/23/pubmed PY - 2018/6/23/medline KW - Charcoal KW - Environmental risk KW - Redox chemistry KW - Toxic elements KW - Wetland soils SP - 1059 EP - 1071 JF - The Science of the total environment JO - Sci Total Environ VL - 624 N2 - There is a lack of knowledge on the effects of biochar (BC) on the release dynamics of potentially toxic elements (PTEs) in different phases of soil under systematic change of redox potential (EH). We aimed to elucidate the impact of pre-definite EH on the release dynamics of dissolved and colloidal concentrations of Cd, Cu, Ni, and Zn as well as their phytoavailability and potential mobility in the solid-phase of a mining soil treated with rice hull biochar (S+BC) compared to non-treated soil (S). The influence of EH-dependent changes of soil pH, dissolved organic carbon (DOC), dissolved aromatic carbon (DAC), Fe, Mn, SO42-, and Cl- on the elements release was also determined. The experiment was conducted stepwise from reducing (-30mV in S and -12mV in S+BC) to oxidizing (+218mV in S and +333mV in S+BC) conditions using an automated biogeochemical microcosm system. Biochar-treated soil exhibited a wider range of EH and a lower pH than the non-treated soil. Dissolved concentrations of Cd, Cu, Ni, Zn, Fe, Mn, SO42-, and DAC increased under oxic conditions in the non-treated and biochar-treated-soils, which might be due to the decline of pH, and/or sulfide oxidation. Cadmium was more abundant in the colloidal fraction, while Cu, Mn, and DOC were more abundant in the dissolved fraction. Nickel, Zn, and Fe distributed almost equally in both fractions. Biochar increased the dissolved concentration of Cd, Ni, Zn and in particular Cu under oxic conditions. However, the biochar did not significantly affect the colloidal fraction of Cd, Cu, Ni, and Zn. The phytoavailability of the studied elements was higher than the potential mobility. We conclude that increasing the dissolved concentrations of the elements under oxic conditions might increase their release and transfer into the groundwater and the food chain which should be harmful for the environment. SN - 1879-1026 UR - https://www.unboundmedicine.com/medline/citation/29929223/Biochar_affects_the_dissolved_and_colloidal_concentrations_of_Cd_Cu_Ni_and_Zn_and_their_phytoavailability_and_potential_mobility_in_a_mining_soil_under_dynamic_redox_conditions_ DB - PRIME DP - Unbound Medicine ER -
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