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Effects of metal stabilizers on soil hydraulic characteristics and mobility of cadmium.
Environ Sci Pollut Res Int. 2020 Jun 12 [Online ahead of print]ES

Abstract

This study investigated the effect of typical stabilizers on hydraulic properties, immobilization, and leachate characteristics based on the diffusive gradient thin-films technique (DGT) and a leaching experiment. Three types of stabilizers were classified based on various characteristics of soil field capacity (θf), and their immobilization effects were as follows: (i) θf increased and the immobilization of Cd was achieved with nanohydroxyapatite, increasing θf by 19.36% and decreasing the bioavailable Cd by 78.84%; (ii) the increasing θf conversely inhibited cadmium stabilization. Straw biochar averagely promoted θf by 17.39%, while the stabilization was suppressed; (iii) other stabilizers (zeolite, montmorillonite, and sepiolite) had no significant effect on θf and immobilization. It is suggested that stabilization depends on chemical mechanisms and is probably also affected by hydraulic mechanisms. The first types of stabilizers formed precipitates with poor solubility, and the strong affinity of heavy metals to soil particles can account for that the increasing θf had a negligible influence on the dissolution equilibrium of the heavy metals. Attapulgite also belongs to this type. The second and third types of stabilizers primarily adsorbed cadmium through ion exchange, resulting in the relatively easy heavy metal release. Increasing θf facilitated the desorption of heavy metals in the case of the second stabilizer type. However, the inconspicuous change in θf caused by the third stabilizer type had no impact on stabilization. Moreover, Cd leaching was positively correlated with bioavailable Cd and soil permeability. Heavy metal migration induced by colloids less than 90 nm in coarse biochar treatments deserves further research.

Authors+Show Affiliations

School of Environmental Science and Engineering, Guangzhou University, Guangzhou, 510006, China.School of Environmental Science and Engineering, Guangzhou University, Guangzhou, 510006, China. ldggq@gzhu.edu.cn. Linköping University-Guangzhou University Research Center on Urban Sustainable Development, Guangzhou University, Guangzhou, 510006, China. ldggq@gzhu.edu.cn. Key Laboratory for Water Quality and Conservation of the Pearl River Delta, Ministry of Education, Guangzhou University, Guangzhou, 510006, China. ldggq@gzhu.edu.cn. Guangdong Provincial Key Laboratory of Radionuclides Pollution Control and Resources, Guangzhou University, Guangzhou, 510006, China. ldggq@gzhu.edu.cn.School of Environmental Science and Engineering, Guangzhou University, Guangzhou, 510006, China. Linköping University-Guangzhou University Research Center on Urban Sustainable Development, Guangzhou University, Guangzhou, 510006, China. Key Laboratory for Water Quality and Conservation of the Pearl River Delta, Ministry of Education, Guangzhou University, Guangzhou, 510006, China.School of Environmental Science and Engineering, Guangzhou University, Guangzhou, 510006, China. Linköping University-Guangzhou University Research Center on Urban Sustainable Development, Guangzhou University, Guangzhou, 510006, China. Key Laboratory for Water Quality and Conservation of the Pearl River Delta, Ministry of Education, Guangzhou University, Guangzhou, 510006, China.School of Environmental Science and Engineering, Guangzhou University, Guangzhou, 510006, China.School of Environmental Science and Engineering, Guangzhou University, Guangzhou, 510006, China.School of Environmental Science and Engineering, Guangzhou University, Guangzhou, 510006, China.School of Environmental Science and Engineering, Guangzhou University, Guangzhou, 510006, China.School of Environmental Science and Engineering, Guangzhou University, Guangzhou, 510006, China. Linköping University-Guangzhou University Research Center on Urban Sustainable Development, Guangzhou University, Guangzhou, 510006, China. Key Laboratory for Water Quality and Conservation of the Pearl River Delta, Ministry of Education, Guangzhou University, Guangzhou, 510006, China. Guangdong Provincial Key Laboratory of Radionuclides Pollution Control and Resources, Guangzhou University, Guangzhou, 510006, China.Key Laboratory for Water Quality and Conservation of the Pearl River Delta, Ministry of Education, Guangzhou University, Guangzhou, 510006, China. Guangdong Provincial Key Laboratory of Radionuclides Pollution Control and Resources, Guangzhou University, Guangzhou, 510006, China.

Pub Type(s)

Journal Article

Language

eng

PubMed ID

32533487

Citation

Liu, Lirong, et al. "Effects of Metal Stabilizers On Soil Hydraulic Characteristics and Mobility of Cadmium." Environmental Science and Pollution Research International, 2020.
Liu L, Luo D, Wei L, et al. Effects of metal stabilizers on soil hydraulic characteristics and mobility of cadmium. Environ Sci Pollut Res Int. 2020.
Liu, L., Luo, D., Wei, L., Liu, Y., Huang, S., Huang, L., Xie, Z., Xiao, T., Huang, X., & Wu, Q. (2020). Effects of metal stabilizers on soil hydraulic characteristics and mobility of cadmium. Environmental Science and Pollution Research International. https://doi.org/10.1007/s11356-020-09483-9
Liu L, et al. Effects of Metal Stabilizers On Soil Hydraulic Characteristics and Mobility of Cadmium. Environ Sci Pollut Res Int. 2020 Jun 12; PubMed PMID: 32533487.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Effects of metal stabilizers on soil hydraulic characteristics and mobility of cadmium. AU - Liu,Lirong, AU - Luo,Dinggui, AU - Wei,Lezhang, AU - Liu,Yu, AU - Huang,Sibin, AU - Huang,Liting, AU - Xie,Zhenyu, AU - Xiao,Tangfu, AU - Huang,Xuexia, AU - Wu,Qihang, Y1 - 2020/06/12/ PY - 2020/03/24/received PY - 2020/05/26/accepted PY - 2020/6/14/entrez KW - Bioavailability KW - Colloids KW - Hydraulic properties KW - Immobilization KW - Leaching JF - Environmental science and pollution research international JO - Environ Sci Pollut Res Int N2 - This study investigated the effect of typical stabilizers on hydraulic properties, immobilization, and leachate characteristics based on the diffusive gradient thin-films technique (DGT) and a leaching experiment. Three types of stabilizers were classified based on various characteristics of soil field capacity (θf), and their immobilization effects were as follows: (i) θf increased and the immobilization of Cd was achieved with nanohydroxyapatite, increasing θf by 19.36% and decreasing the bioavailable Cd by 78.84%; (ii) the increasing θf conversely inhibited cadmium stabilization. Straw biochar averagely promoted θf by 17.39%, while the stabilization was suppressed; (iii) other stabilizers (zeolite, montmorillonite, and sepiolite) had no significant effect on θf and immobilization. It is suggested that stabilization depends on chemical mechanisms and is probably also affected by hydraulic mechanisms. The first types of stabilizers formed precipitates with poor solubility, and the strong affinity of heavy metals to soil particles can account for that the increasing θf had a negligible influence on the dissolution equilibrium of the heavy metals. Attapulgite also belongs to this type. The second and third types of stabilizers primarily adsorbed cadmium through ion exchange, resulting in the relatively easy heavy metal release. Increasing θf facilitated the desorption of heavy metals in the case of the second stabilizer type. However, the inconspicuous change in θf caused by the third stabilizer type had no impact on stabilization. Moreover, Cd leaching was positively correlated with bioavailable Cd and soil permeability. Heavy metal migration induced by colloids less than 90 nm in coarse biochar treatments deserves further research. SN - 1614-7499 UR - https://www.unboundmedicine.com/medline/citation/32533487/Effects_of_metal_stabilizers_on_soil_hydraulic_characteristics_and_mobility_of_cadmium L2 - https://dx.doi.org/10.1007/s11356-020-09483-9 DB - PRIME DP - Unbound Medicine ER -
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