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

Ali El-Naggar; Sabry M. Shaheen; Yong Sik Ok; Jörg Rinklebe

doi:10.1016/j.scitotenv.2017.12.190

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

Ali El-Naggar, Sabry M. Shaheen, Yong Sik Ok, Jörg Rinklebe

Research output: Contribution to journal › Article › peer-review

223 Citations (Scopus)

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 (E_H). We aimed to elucidate the impact of pre-definite E_H 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 E_H-dependent changes of soil pH, dissolved organic carbon (DOC), dissolved aromatic carbon (DAC), Fe, Mn, SO₄^{2 −}, and Cl⁻ on the elements release was also determined. The experiment was conducted stepwise from reducing (− 30 mV in S and − 12 mV in S + BC) to oxidizing (+ 218 mV in S and + 333 mV in S + BC) conditions using an automated biogeochemical microcosm system. Biochar-treated soil exhibited a wider range of E_H and a lower pH than the non-treated soil. Dissolved concentrations of Cd, Cu, Ni, Zn, Fe, Mn, SO₄^{2 −}, 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.

Original language	English
Pages (from-to)	1059-1071
Number of pages	13
Journal	Science of the Total Environment
Volume	624
DOIs	https://doi.org/10.1016/j.scitotenv.2017.12.190
Publication status	Published - 2018 May 15

Bibliographical note

Funding Information:
We thank the German Alexander von Humboldt Foundation (Ref 3.4 - EGY - 1185373 - GF-E) for the financial support of the experienced researchers’ fellowship of Prof. Dr. Shaheen at the University of Wuppertal, Germany. Also, we thank the National Research Foundation of Korea (NRF-2015R1A2A2A11001432) for the financial support. The authors thank Tianran Li and Prof. Jian-guo Jiang from School of Environment at Tsinghua University, China for his help in soil sampling and Mr. C. Vandenhirtz for their technical assistance.

Funding Information:
We thank the German Alexander von Humboldt Foundation (Ref 3.4 - EGY - 1185373 - GF-E) for the financial support of the experienced researchers' fellowship of Prof. Dr. Shaheen at the University of Wuppertal, Germany. Also, we thank the National Research Foundation of Korea ( NRF-2015R1A2A2A11001432 ) for the financial support. The authors thank Tianran Li and Prof. Jian-guo Jiang from School of Environment at Tsinghua University, China for his help in soil sampling and Mr. C. Vandenhirtz for their technical assistance.

Publisher Copyright:
© 2017

Keywords

Charcoal
Environmental risk
Redox chemistry
Toxic elements
Wetland soils

ASJC Scopus subject areas

Environmental Engineering
Environmental Chemistry
Waste Management and Disposal
Pollution

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10.1016/j.scitotenv.2017.12.190

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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. / El-Naggar, Ali; Shaheen, Sabry M.; Ok, Yong Sik et al.
In: Science of the Total Environment, Vol. 624, 15.05.2018, p. 1059-1071.

Research output: Contribution to journal › Article › peer-review

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title = "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",

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 (− 30 mV in S and − 12 mV in S + BC) to oxidizing (+ 218 mV in S and + 333 mV 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.",

keywords = "Charcoal, Environmental risk, Redox chemistry, Toxic elements, Wetland soils",

author = "Ali El-Naggar and Shaheen, {Sabry M.} and Ok, {Yong Sik} and J{\"o}rg Rinklebe",

note = "Funding Information: We thank the German Alexander von Humboldt Foundation (Ref 3.4 - EGY - 1185373 - GF-E) for the financial support of the experienced researchers{\textquoteright} fellowship of Prof. Dr. Shaheen at the University of Wuppertal, Germany. Also, we thank the National Research Foundation of Korea (NRF-2015R1A2A2A11001432) for the financial support. The authors thank Tianran Li and Prof. Jian-guo Jiang from School of Environment at Tsinghua University, China for his help in soil sampling and Mr. C. Vandenhirtz for their technical assistance. Funding Information: We thank the German Alexander von Humboldt Foundation (Ref 3.4 - EGY - 1185373 - GF-E) for the financial support of the experienced researchers' fellowship of Prof. Dr. Shaheen at the University of Wuppertal, Germany. Also, we thank the National Research Foundation of Korea ( NRF-2015R1A2A2A11001432 ) for the financial support. The authors thank Tianran Li and Prof. Jian-guo Jiang from School of Environment at Tsinghua University, China for his help in soil sampling and Mr. C. Vandenhirtz for their technical assistance. Publisher Copyright: {\textcopyright} 2017",

year = "2018",

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doi = "10.1016/j.scitotenv.2017.12.190",

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AU - El-Naggar, Ali

AU - Shaheen, Sabry M.

AU - Ok, Yong Sik

AU - Rinklebe, Jörg

N1 - Funding Information: We thank the German Alexander von Humboldt Foundation (Ref 3.4 - EGY - 1185373 - GF-E) for the financial support of the experienced researchers’ fellowship of Prof. Dr. Shaheen at the University of Wuppertal, Germany. Also, we thank the National Research Foundation of Korea (NRF-2015R1A2A2A11001432) for the financial support. The authors thank Tianran Li and Prof. Jian-guo Jiang from School of Environment at Tsinghua University, China for his help in soil sampling and Mr. C. Vandenhirtz for their technical assistance. Funding Information: We thank the German Alexander von Humboldt Foundation (Ref 3.4 - EGY - 1185373 - GF-E) for the financial support of the experienced researchers' fellowship of Prof. Dr. Shaheen at the University of Wuppertal, Germany. Also, we thank the National Research Foundation of Korea ( NRF-2015R1A2A2A11001432 ) for the financial support. The authors thank Tianran Li and Prof. Jian-guo Jiang from School of Environment at Tsinghua University, China for his help in soil sampling and Mr. C. Vandenhirtz for their technical assistance. Publisher Copyright: © 2017

PY - 2018/5/15

Y1 - 2018/5/15

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 (− 30 mV in S and − 12 mV in S + BC) to oxidizing (+ 218 mV in S and + 333 mV 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.

AB - 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 (− 30 mV in S and − 12 mV in S + BC) to oxidizing (+ 218 mV in S and + 333 mV 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.

KW - Charcoal

KW - Environmental risk

KW - Redox chemistry

KW - Toxic elements

KW - Wetland soils

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AN - SCOPUS:85039165995

SN - 0048-9697

VL - 624

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JO - Science of the Total Environment

JF - Science of the Total Environment

ER -

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

Abstract

Bibliographical note

Keywords

ASJC Scopus subject areas

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