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Shi Y, Sheng A, Zhang F, Zhao Z, Bao H, Li Z, Zan F, Lou W, Cao L, Crittenden JC, Wang L, Chen J. Roles of the SOM and clay minerals in alleviating the leaching of Pb, Zn, and Cd from the Pb/Zn smelter soil: Multi-surface model and DFT study. THE SCIENCE OF THE TOTAL ENVIRONMENT 2024; 940:173536. [PMID: 38802006 DOI: 10.1016/j.scitotenv.2024.173536] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/27/2024] [Revised: 05/14/2024] [Accepted: 05/24/2024] [Indexed: 05/29/2024]
Abstract
Soil organic matter (SOM) and clay minerals are important sinks for reactive heavy metals (HMs) and exogenous hydrogen ions (H+). Therefore, HMs are likely to be released into soil porewater under acid rainfall conditions due to the competitive adsorption of H+. However, negligible Lead, Zinc, and Cadmium (<6 ‰) in the Pb/Zn smelter soil were leached, and the effects of SOM and clay minerals on HMs leaching were unclear. Herein, the H+ consumption and HMs redistribution on SOM and clay minerals were quantitated by the multi-surface model and density functional theory calculations to reveal the roles of SOM and clay minerals in alleviating HMs' leaching. Clay minerals consumed 43.2 %-52.0 % of the exogenous H+, serving as the dominant sink for the exogenous H+ due to its high content and hindering H+ competitive adsorption on SOM. Protonation of the functional groups constituted >90 % of the total H+ captured by clay minerals. Meanwhile, some H+ also competed with HMs for adsorption sites on clay minerals due to its 0.497-fold to 1.54-fold higher binding energies than HMs, resulting in the release of HMs. On the contrary, SOM served as an accommodator for taking over the released HMs from clay minerals. The HMs complexation on the low-affinity sites (R-L-) of SOM was responsible for the recapture of HMs. In Ca-enriched soil, the released HMs were also recaptured by SOM via ion exchange on the R-L-Ca+ and the high-affinity sites (R-H-Ca+) sites due to the 30.8 %-178 % higher binding energies of HMs on these sites than those of Ca. As a result, >63.4 % of the released HMs from clay minerals were transferred to the SOM. Thus, the synergy of SOM and clay minerals in alleviating the leaching of HMs in Pb/Zn smelter soils cannot be ignored in risk assessment and soil remediation.
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Affiliation(s)
- Yao Shi
- Hubei Key Laboratory of Multi-media Pollution Cooperative Control in Yangtze Basin, School of Environmental Science and Engineering, Huazhong University of Science and Technology, 1037 Luoyu Road, Wuhan 430074, China.
| | - Anxu Sheng
- Hubei Key Laboratory of Multi-media Pollution Cooperative Control in Yangtze Basin, School of Environmental Science and Engineering, Huazhong University of Science and Technology, 1037 Luoyu Road, Wuhan 430074, China.
| | - Fengjiao Zhang
- Hubei Key Laboratory of Multi-media Pollution Cooperative Control in Yangtze Basin, School of Environmental Science and Engineering, Huazhong University of Science and Technology, 1037 Luoyu Road, Wuhan 430074, China.
| | - Zezhou Zhao
- Hubei Key Laboratory of Multi-media Pollution Cooperative Control in Yangtze Basin, School of Environmental Science and Engineering, Huazhong University of Science and Technology, 1037 Luoyu Road, Wuhan 430074, China.
| | - Haiyi Bao
- Hubei Key Laboratory of Multi-media Pollution Cooperative Control in Yangtze Basin, School of Environmental Science and Engineering, Huazhong University of Science and Technology, 1037 Luoyu Road, Wuhan 430074, China.
| | - Zhida Li
- Hubei Key Laboratory of Multi-media Pollution Cooperative Control in Yangtze Basin, School of Environmental Science and Engineering, Huazhong University of Science and Technology, 1037 Luoyu Road, Wuhan 430074, China.
| | - Feixiang Zan
- Hubei Key Laboratory of Multi-media Pollution Cooperative Control in Yangtze Basin, School of Environmental Science and Engineering, Huazhong University of Science and Technology, 1037 Luoyu Road, Wuhan 430074, China.
| | - Wei Lou
- Hunan Provincial Engineering Research Center for Resource Recovery and Safe Disposal of Industrial Solid Waste (Hunan Heqing Environmental Technology Co., Ltd.), Changsha 410032, China
| | - Liu Cao
- Environmental Protection Agency of Jiyuan Production City Integration Demonstration Area, Jiyuan 459000, China
| | - John C Crittenden
- Brook Byers Institute for Sustainable Systems, School of Civil and Environmental Engineering, Georgia Institute of Technology, Atlanta, GA 30332, United States.
| | - Linling Wang
- Hubei Key Laboratory of Multi-media Pollution Cooperative Control in Yangtze Basin, School of Environmental Science and Engineering, Huazhong University of Science and Technology, 1037 Luoyu Road, Wuhan 430074, China.
| | - Jing Chen
- Hubei Key Laboratory of Multi-media Pollution Cooperative Control in Yangtze Basin, School of Environmental Science and Engineering, Huazhong University of Science and Technology, 1037 Luoyu Road, Wuhan 430074, China.
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Li Y, Wang K, Dötterl S, Xu J, Garland G, Liu X. The critical role of organic matter for cadmium-lead interactions in soil: Mechanisms and risks. JOURNAL OF HAZARDOUS MATERIALS 2024; 476:135123. [PMID: 38981228 DOI: 10.1016/j.jhazmat.2024.135123] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/11/2024] [Revised: 06/24/2024] [Accepted: 07/05/2024] [Indexed: 07/11/2024]
Abstract
Understanding the interaction mechanisms between complex heavy metals and soil components is a prerequisite for effectively forecasting the mobility and availability of contaminants in soils. Soil organic matter (SOM), with its diverse functional groups, has long been a focal point of research interest. In this study, four soils with manipulated levels of SOM, cadmium (Cd) and lead (Pb) were subjected to a 90-day incubation experiment. The competitive interactions between Cd and Pb in soils were investigated using Fourier transform infrared spectrometer (FTIR), X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), and X-ray adsorption near-edge structure (XANES) analysis. Our results indicate that Pb competed with Cd for adsorption sites on the surface of SOM, particularly on carboxyl and hydroxyl functional groups. Approximately 22.6 % of Cd adsorption sites on humus were occupied by Pb. The use of sequentially extracted exchangeable heavy metals as indicators for environment risk assessments, considering variations in soil physico-chemical properties and synergistic or antagonistic effects between contaminants, provides a better estimation of metal bioavailability and its potential impacts. Integrating comprehensive contamination characterization of heavy metal interactions with the soil organic phase is an important advancement to assess the environmental risks of heavy metal dynamics in soil compared to individual contamination assessments.
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Affiliation(s)
- Yiren Li
- College of Environmental and Resource Sciences, Zhejiang Provincial Key Laboratory of Agricultural Resources and Environment, Zhejiang University, Hangzhou 310058, China; Department of Environmental Systems Science, ETH Zürich, Zurich 8092, Switzerland
| | - Kai Wang
- College of Environmental and Resource Sciences, Zhejiang Provincial Key Laboratory of Agricultural Resources and Environment, Zhejiang University, Hangzhou 310058, China
| | - Sebastian Dötterl
- Department of Environmental Systems Science, ETH Zürich, Zurich 8092, Switzerland
| | - Jianming Xu
- College of Environmental and Resource Sciences, Zhejiang Provincial Key Laboratory of Agricultural Resources and Environment, Zhejiang University, Hangzhou 310058, China
| | - Gina Garland
- Department of Environmental Systems Science, ETH Zürich, Zurich 8092, Switzerland.
| | - Xingmei Liu
- College of Environmental and Resource Sciences, Zhejiang Provincial Key Laboratory of Agricultural Resources and Environment, Zhejiang University, Hangzhou 310058, China.
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Lian W, Yu G, Ma J, Xiong J, Niu C, Zhang R, Xie H, Weng L. Quantitative Insights into Phosphate-Enhanced Lead Immobilization on Goethite. ENVIRONMENTAL SCIENCE & TECHNOLOGY 2024; 58:11748-11759. [PMID: 38912726 PMCID: PMC11223472 DOI: 10.1021/acs.est.4c03927] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/20/2024] [Revised: 06/08/2024] [Accepted: 06/10/2024] [Indexed: 06/25/2024]
Abstract
Despite extensive study, geochemical modeling often fails to accurately predict lead (Pb) immobilization in environmental samples. This study employs the Charge Distribution MUlti-SIte Complexation (CD-MUSIC) model, X-ray absorption fine structure (XAFS), and density functional theory (DFT) to investigate mechanisms of phosphate (PO4) induced Pb immobilization on metal (hydr)oxides. The results reveal that PO4 mainly enhances bidentate-adsorbed Pb on goethite via electrostatic synergy at low PO4 concentrations. At relatively low pH (below 5.5) and elevated PO4 concentrations, the formation of the monodentate-O-sharing Pb-PO4 ternary structure on goethite becomes important. Precipitation of hydropyromorphite (Pb5(PO4)3OH) occurs at high pH and high concentrations of Pb and PO4, with an optimized log Ksp value of -82.02. The adjustment of log Ksp compared to that in the bulk solution allows for quantification of the overall Pb-PO4 precipitation enhanced by goethite. The CD-MUSIC model parameters for both the bidentate Pb complex and the monodentate-O-sharing Pb-PO4 ternary complex were optimized. The modeling results and parameters are further validated and specified with XAFS analysis and DFT calculations. This study provides quantitative molecular-level insights into the contributions of electrostatic enhancement, ternary complexation, and precipitation to phosphate-induced Pb immobilization on oxides, which will be helpful in resolving controversies regarding Pb distribution in environmental samples.
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Affiliation(s)
- Wanli Lian
- Key
Laboratory for Environmental Factors Control of Agro-Product Quality
Safety, Agro-Environmental Protection Institute,
Ministry of Agriculture and Rural Affairs, Tianjin 300191, China
| | - Guanghui Yu
- Institute
of Surface-Earth System Science, School of Earth System Science, Tianjin University, Tianjin 300072, China
| | - Jie Ma
- Key
Laboratory for Environmental Factors Control of Agro-Product Quality
Safety, Agro-Environmental Protection Institute,
Ministry of Agriculture and Rural Affairs, Tianjin 300191, China
| | - Juan Xiong
- Key
Laboratory of Arable Land Conservation (Middle and Lower Reaches of
Yangtze River), Ministry of Agriculture and Rural Affairs of the People’s
Republic of China, College of Resources and Environment, Huazhong Agricultural University, Wuhan 430070, China
| | - Cuiyun Niu
- Key
Laboratory for Environmental Factors Control of Agro-Product Quality
Safety, Agro-Environmental Protection Institute,
Ministry of Agriculture and Rural Affairs, Tianjin 300191, China
| | - Ran Zhang
- Key
Laboratory for Environmental Factors Control of Agro-Product Quality
Safety, Agro-Environmental Protection Institute,
Ministry of Agriculture and Rural Affairs, Tianjin 300191, China
| | - Haijiao Xie
- Hangzhou
Yanqu Information Technology Co., Ltd, Hangzhou 310003, China
| | - Liping Weng
- Key
Laboratory for Environmental Factors Control of Agro-Product Quality
Safety, Agro-Environmental Protection Institute,
Ministry of Agriculture and Rural Affairs, Tianjin 300191, China
- Department
of Soil Quality, Wageningen University, P.O. Box 47, 6700AA Wageningen, The Netherlands
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Bai Z, Li T, Zhang S, Wang G, Xu X, Zhou W, Pan X, Pu Y, Jia Y, Yang Z, Long L. Effects of climate and geochemical properties on the chemical forms of soil Cd, Pb and Cr along a more than 4000 km transect. JOURNAL OF HAZARDOUS MATERIALS 2024; 467:133746. [PMID: 38341885 DOI: 10.1016/j.jhazmat.2024.133746] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/01/2023] [Revised: 01/15/2024] [Accepted: 02/05/2024] [Indexed: 02/13/2024]
Abstract
Soil heavy metal speciation has received much attention for their different ecological and environmental effects. However, the effects of climate and soil geochemical properties on them in uncontaminated soils at macroscale were still unclear. Therefore, a transect more than 4000 km was chosen to study the effects of these factors on soil Cd, Pb and Cr forms. The results revealed that mean annual temperature and precipitation showed significant positive relations with the exchangeable and Fe-Mn oxide bound states of Cd, Pb and Cr, and residual Cr. And humidity and drought indexes were significantly positively correlated with their organic and carbonate bound forms, respectively. As for soil geochemical properties, pH displayed significant negative relationships with exchangeable, Fe-Mn oxide and organic bound Pb and Cr, and exchangeable Cd. Fe2O3 was significantly positively with the exchangeable and Fe-Mn oxide bound Cd, Pb and Cr, and residual Cr. And soil organic matter showed positive relations with organic bound Pb and Cr, and residual Cd and Cr, displayed negative relationships with carbonated bound Pb and Cr. Overall, climate and soil geochemical properties together affect the transformation and transport of heavy metals between different forms in uncontaminated soils.
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Affiliation(s)
- Zhiqiang Bai
- College of Environmental Sciences, Sichuan Agricultural University, Wenjiang 611130, PR China; Sichuan Provincial Key Laboratory of Soil Environmental Protection, Wenjiang 611130, PR China
| | - Ting Li
- College of Resources, Sichuan Agricultural University, Wenjiang 611130, PR China
| | - Shirong Zhang
- College of Environmental Sciences, Sichuan Agricultural University, Wenjiang 611130, PR China; Sichuan Provincial Key Laboratory of Soil Environmental Protection, Wenjiang 611130, PR China.
| | - Guiyin Wang
- College of Environmental Sciences, Sichuan Agricultural University, Wenjiang 611130, PR China; Sichuan Provincial Key Laboratory of Soil Environmental Protection, Wenjiang 611130, PR China
| | - Xiaoxun Xu
- College of Environmental Sciences, Sichuan Agricultural University, Wenjiang 611130, PR China
| | - Wei Zhou
- College of Resources, Sichuan Agricultural University, Wenjiang 611130, PR China
| | - Xiaomei Pan
- Chengdu Agricultural College, Wenjiang 611130, PR China
| | - Yulin Pu
- College of Resources, Sichuan Agricultural University, Wenjiang 611130, PR China
| | - Yongxia Jia
- College of Resources, Sichuan Agricultural University, Wenjiang 611130, PR China
| | - Zhanbiao Yang
- College of Environmental Sciences, Sichuan Agricultural University, Wenjiang 611130, PR China
| | - Lulu Long
- College of Environmental Sciences, Sichuan Agricultural University, Wenjiang 611130, PR China
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5
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Li Y, He T, Ding F, Li X, Huang Y, He E, Cai H, Shi P, Liu J, Li Y, Qu R, Zheng W, Xie Y, Liu X, Zhao L, Liu M. The inventory of pollutants in brownfield sites: An innovative strategy for prevention and control of soil pollution in China. Sci Bull (Beijing) 2024; 69:566-569. [PMID: 38218633 DOI: 10.1016/j.scib.2023.12.055] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/15/2024]
Affiliation(s)
- Ye Li
- Key Laboratory of Geographic Information Science (Ministry of Education), School of Geographic Sciences, East China Normal University, Shanghai 200241, China
| | - Tianhao He
- Key Laboratory of Geographic Information Science (Ministry of Education), School of Geographic Sciences, East China Normal University, Shanghai 200241, China
| | - Fangfang Ding
- Key Laboratory of Geographic Information Science (Ministry of Education), School of Geographic Sciences, East China Normal University, Shanghai 200241, China
| | - Xiaofei Li
- Key Laboratory of Geographic Information Science (Ministry of Education), School of Geographic Sciences, East China Normal University, Shanghai 200241, China
| | - Ye Huang
- Key Laboratory of Geographic Information Science (Ministry of Education), School of Geographic Sciences, East China Normal University, Shanghai 200241, China
| | - Erkai He
- Key Laboratory of Geographic Information Science (Ministry of Education), School of Geographic Sciences, East China Normal University, Shanghai 200241, China
| | - Hongming Cai
- Institute of Surface-Earth System Science, School of Earth System Science, Tianjin University, Tianjin 300072, China
| | - Peili Shi
- Technical Centre for Soil, Agriculture and Rural Ecology and Environment, Ministry of Ecology and Environment, Beijing 100012, China
| | - Jian Liu
- College of Environmental Natural Resource Sciences, Zhejiang University, Hangzhou 310058, China
| | - Yan Li
- Key Laboratory of Geographic Information Science (Ministry of Education), School of Geographic Sciences, East China Normal University, Shanghai 200241, China
| | - Ruijuan Qu
- State Key Laboratory of Pollution Control and Resources Reuse, School of the Environment, Nanjing University, Nanjing 210023, China
| | - Wang Zheng
- Institute of Surface-Earth System Science, School of Earth System Science, Tianjin University, Tianjin 300072, China
| | - Yunfeng Xie
- Technical Centre for Soil, Agriculture and Rural Ecology and Environment, Ministry of Ecology and Environment, Beijing 100012, China
| | - Xingmei Liu
- College of Environmental Natural Resource Sciences, Zhejiang University, Hangzhou 310058, China
| | - Ling Zhao
- School of Environmental Science and Engineering, Shanghai Jiao Tong University, Shanghai 200240, China
| | - Min Liu
- Key Laboratory of Geographic Information Science (Ministry of Education), School of Geographic Sciences, East China Normal University, Shanghai 200241, China.
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Zhang C, Guan DX, Jiang YF, Menezes-Blackburn D, Yu T, Yang Z, Ma LQ. Insight into the availability and desorption kinetics of Se and Cd in naturally-rich soils using diffusive gradients in thin-films technique. JOURNAL OF HAZARDOUS MATERIALS 2024; 465:133330. [PMID: 38147757 DOI: 10.1016/j.jhazmat.2023.133330] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/06/2023] [Revised: 12/05/2023] [Accepted: 12/19/2023] [Indexed: 12/28/2023]
Abstract
Cadmium (Cd) contamination of selenium (Se)-rich soils may jeopardize the nutritional benefits of Se-biofortified crops. This study employed diffusive gradients in thin-films (DGT) technique and DIFS (DGT-induced fluxes in soils) model to understand the interdependency and driving factors of Se and Cd distribution and desorption kinetics across 50 soils from south China with naturally elevated levels. DGT-labile Se was the highest (up to 2.66 μg L-1) in non-carbonate/shale-derived soils, while Cd was maximal (5.53 μg L-1) in carbonate-based soils, reflecting soil background concentrations and soil characteristics. Over one-third of the soils showed labile Se:Cd molar ratio below 0.7, suggesting Cd phytotoxicity risks. The DIFS-derived response times (Tc) and desorption rate constants (k-1) suggested that Se was resupplied to the soil solution faster than Cd in soils with higher pH and SOM level, but Se resupply was still restricted due to the rapid depletion of its labile pool. As the first study of Se and Cd release kinetics in soils, our results reveal dependence on soil parent materials, with low labile Se:Cd soils presenting greater Cd hazards. By elucidating Se and Cd lability and interactions in soils, our findings help to inform management strategies to balance reduced Cd risk with adequate Se availability.
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Affiliation(s)
- Chao Zhang
- Zhejiang Provincial Key Laboratory of Agricultural Resources and Environment, Institute of Soil and Water Resources and Environmental Science, College of Environmental and Resource Sciences, Zhejiang University, Hangzhou 310058, China
| | - Dong-Xing Guan
- Zhejiang Provincial Key Laboratory of Agricultural Resources and Environment, Institute of Soil and Water Resources and Environmental Science, College of Environmental and Resource Sciences, Zhejiang University, Hangzhou 310058, China.
| | - Yi-Fan Jiang
- Zhejiang Provincial Key Laboratory of Agricultural Resources and Environment, Institute of Soil and Water Resources and Environmental Science, College of Environmental and Resource Sciences, Zhejiang University, Hangzhou 310058, China
| | - Daniel Menezes-Blackburn
- Department of Soils, Water and Agricultural Engineering, CAMS, Sultan Qaboos University, PO Box 34, Al-khod 123, Sultanate of Oman
| | - Tao Yu
- School of Science, China University of Geosciences, Beijing 100083, China
| | - Zhongfang Yang
- School of Earth Sciences and Resources, China University of Geosciences, Beijing 100083, China
| | - Lena Q Ma
- Zhejiang Provincial Key Laboratory of Agricultural Resources and Environment, Institute of Soil and Water Resources and Environmental Science, College of Environmental and Resource Sciences, Zhejiang University, Hangzhou 310058, China
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Wu Y, Yan Y, Wang Z, Tan Z, Zhou T. Biochar application for the remediation of soil contaminated with potentially toxic elements: Current situation and challenges. JOURNAL OF ENVIRONMENTAL MANAGEMENT 2024; 351:119775. [PMID: 38070425 DOI: 10.1016/j.jenvman.2023.119775] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/20/2023] [Revised: 11/27/2023] [Accepted: 12/03/2023] [Indexed: 01/14/2024]
Abstract
Recently, biochar has garnered extensive attention in the remediation of soils contaminated with potentially toxic elements (PTEs) owing to its exceptional adsorption properties and straightforward operation. Most researchers have primarily concentrated on the effects, mechanisms, impact factors, and risks of biochar in remediation of PTEs. However, concerns about the long-term safety and impact of biochar have restricted its application. This review aims to establish a basis for the large-scale popularization of biochar for remediating PTEs-contaminated soil based on a review of interactive mechanisms between soil, PTEs and biochar, as well as the current situation of biochar for remediation in PTEs scenarios. Biochar can directly interact with PTEs or indirectly with soil components, influencing the bioavailability, mobility, and toxicity of PTEs. The efficacy of biochar in remediation varies depending on biomass feedstock, pyrolysis temperature, type of PTEs, and application rate. Compared to pristine biochar, modified biochar offers feasible solutions for tailoring specialized biochar suited to specific PTEs-contaminated soil. Main challenges limiting the applications of biochar are overdose and potential risks. The used biochar is separated from the soil that not only actually removes PTEs, but also mitigates the negative long-term effects of biochar. A sustainable remediation technology is advocated that enables the recovery and regeneration (95.0-95.6%) of biochar from the soil and the removal of PTEs (the removal rate of Cd is more than 20%) from the soil. Finally, future research directions are suggested to augment the environmental safety of biochar and promote its wider application.
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Affiliation(s)
- Yi Wu
- Hubei Key Laboratory of Soil Environment and Pollution Remediation, College of Resources and Environment, Huazhong Agricultural University, Wuhan, 430070, China; Key Laboratory of Arable Land Conservation (Middle and Lower Reaches of Yangtse River), College of Resources and Environment, Huazhong Agricultural University, Wuhan, 430070, China; Ministry of Agriculture and Rural Affairs, College of Resources and Environment, Huazhong Agricultural University, Wuhan, 430070, China
| | - Yuhang Yan
- Hubei Key Laboratory of Soil Environment and Pollution Remediation, College of Resources and Environment, Huazhong Agricultural University, Wuhan, 430070, China; Key Laboratory of Arable Land Conservation (Middle and Lower Reaches of Yangtse River), College of Resources and Environment, Huazhong Agricultural University, Wuhan, 430070, China; Ministry of Agriculture and Rural Affairs, College of Resources and Environment, Huazhong Agricultural University, Wuhan, 430070, China
| | - Zongwei Wang
- Hubei Key Laboratory of Soil Environment and Pollution Remediation, College of Resources and Environment, Huazhong Agricultural University, Wuhan, 430070, China; Key Laboratory of Arable Land Conservation (Middle and Lower Reaches of Yangtse River), College of Resources and Environment, Huazhong Agricultural University, Wuhan, 430070, China; Ministry of Agriculture and Rural Affairs, College of Resources and Environment, Huazhong Agricultural University, Wuhan, 430070, China
| | - Zhongxin Tan
- Hubei Key Laboratory of Soil Environment and Pollution Remediation, College of Resources and Environment, Huazhong Agricultural University, Wuhan, 430070, China; Key Laboratory of Arable Land Conservation (Middle and Lower Reaches of Yangtse River), College of Resources and Environment, Huazhong Agricultural University, Wuhan, 430070, China; Ministry of Agriculture and Rural Affairs, College of Resources and Environment, Huazhong Agricultural University, Wuhan, 430070, China.
| | - Tuo Zhou
- China State Key Laboratory of Power Systems, Department of Energy and Power Engineering, Tsinghua University, Beijing, 100084, China
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Li X, Cao Z, Du Y, Zhang Y, Wang J, Ma X, Hu P, Luo Y, Wu L. Multi-metal contaminant mobilizations by natural colloids and nanoparticles in paddy soils during reduction and reoxidation. JOURNAL OF HAZARDOUS MATERIALS 2024; 461:132684. [PMID: 37804759 DOI: 10.1016/j.jhazmat.2023.132684] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/06/2023] [Revised: 09/15/2023] [Accepted: 09/29/2023] [Indexed: 10/09/2023]
Abstract
Naturally-occurring colloids and nanoparticles are crucial in transporting heavy metal contaminants in soil-water systems. However, information on particle-bound metals' size distribution and elemental composition in paddy soils under redox-fluctuation is scarce. Here, we investigated the mobilization of Cu, Cd, and Pb-containing nanoparticles and colloids in four contaminated soils with distinctive geochemical properties during reduction and subsequent re-oxidation. Using AF4-UV-ICP-MS and STEM-EDS, we observed that particle-bound metals were primarily associated with two sizes ranges: 0.3-40 kDa (F1) and 130 kDa-450 nm (F2), which mainly consisted of organic matter (OM), iron hydroxide and clay minerals. Cu and Pb were more likely bound to colloid than Cd. Colloidal Cu, Pb and Cd accounted for averages of 83.2%, 72.4% and 19.8% of their total concentration in solution (<0.45 µm) during soil reduction, and decreased during soil re-oxidation. This proportion was also positively correlated with aqueous pH and DOC but negatively correlated with Eh. Further quantitative analysis demonstrated that Cu/Cd positively correlated with OM at nanometric scale (F1). This study provides quantitative insights into the size, composition and abundance of polymetallic pollutant-carrying particles in paddy soils during redox fluctuation, and highlights the importance of nanometric interactions between OM and toxic cationic metals for their release.
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Affiliation(s)
- Xinyang Li
- CAS Key Laboratory of Soil Environment and Pollution Remediation, Institute of Soil Science, Chinese Academy of Sciences, Nanjing 210008, China
| | - Zhenyu Cao
- CAS Key Laboratory of Soil Environment and Pollution Remediation, Institute of Soil Science, Chinese Academy of Sciences, Nanjing 210008, China
| | - Yanpei Du
- CAS Key Laboratory of Soil Environment and Pollution Remediation, Institute of Soil Science, Chinese Academy of Sciences, Nanjing 210008, China
| | - Yu Zhang
- CAS Key Laboratory of Soil Environment and Pollution Remediation, Institute of Soil Science, Chinese Academy of Sciences, Nanjing 210008, China
| | - Jiajia Wang
- Department of Environmental Science and Engineering, Fudan University, Shanghai 200433, China
| | - Xingmao Ma
- Zachry Department of Civil and Environmental Engineering, Texas A&M University, College Station, TX 77843, United States
| | - Pengjie Hu
- CAS Key Laboratory of Soil Environment and Pollution Remediation, Institute of Soil Science, Chinese Academy of Sciences, Nanjing 210008, China.
| | - Yongming Luo
- CAS Key Laboratory of Soil Environment and Pollution Remediation, Institute of Soil Science, Chinese Academy of Sciences, Nanjing 210008, China
| | - Longhua Wu
- CAS Key Laboratory of Soil Environment and Pollution Remediation, Institute of Soil Science, Chinese Academy of Sciences, Nanjing 210008, China
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9
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Li C, Li M, Zeng J, Yuan S, Luo X, Wu C, Xue S. Migration and distribution characteristics of soil heavy metal(loid)s at a lead smelting site. J Environ Sci (China) 2024; 135:600-609. [PMID: 37778831 DOI: 10.1016/j.jes.2023.02.007] [Citation(s) in RCA: 12] [Impact Index Per Article: 12.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/14/2022] [Revised: 02/02/2023] [Accepted: 02/02/2023] [Indexed: 06/18/2023]
Abstract
Heavy metal(loid)s contamination is a constant issue at smelting sites. It is essential to investigate the spatial distribution and migration characteristics of heavy metal(loid)s in the soil for environmental management and remediation strategies of non-ferrous smelting sites. In this study, 203 soil samples from 57 sites were collected in a typical lead smelting site. The findings demonstrated that there were significant Pb, Zn, Cd, and As contamination in soil samples. The spatial distribution of heavy metal(loid)s showed strong spatial heterogeneity, the contaminated soil areas of Pb, As, Cd, and Zn were 99.5%, 98.9%, 85.3%, and 72.4%, respectively. Pb, Cd, and As contamination of the soil reached a depth of 5 m, which migrated from the surface to deep soil layers. The leaching contents of Zn, Pb, and As decreased obviously in 3-4 m soil layer, but the leaching content of Cd was still high, which indicated the high migration of Cd. With the increase of depth, the proportion of acid soluble fraction of heavy metal(loid)s decreased, and the residual fraction increased. The acid soluble fraction of Cd accounted for a higher proportion, and As mainly existed in reducible and residual fractions in soil. According to the calculation of the migration factor, the migration of heavy metal(loid)s in soils were ordered as Cd > Zn > Pb > As. The outcomes are advantageous for risk reduction and site remediation for non-ferrous metal smelting sites.
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Affiliation(s)
- Chuxuan Li
- School of Metallurgy and Environment, Central South University, Changsha 410083, China
| | - Mu Li
- School of Metallurgy and Environment, Central South University, Changsha 410083, China
| | - Jiaqing Zeng
- School of Metallurgy and Environment, Central South University, Changsha 410083, China
| | - Shanxin Yuan
- School of Metallurgy and Environment, Central South University, Changsha 410083, China
| | - Xinghua Luo
- School of Metallurgy and Environment, Central South University, Changsha 410083, China
| | - Chuan Wu
- School of Metallurgy and Environment, Central South University, Changsha 410083, China; Chinese National Engineering Research Center for Control and Treatment of Heavy Metal Pollution, Central South University, Changsha 410083, China
| | - Shengguo Xue
- School of Metallurgy and Environment, Central South University, Changsha 410083, China; Chinese National Engineering Research Center for Control and Treatment of Heavy Metal Pollution, Central South University, Changsha 410083, China.
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10
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Li Y, Wang Y, Liu J, Gustave W, Zeng L, Xu J, Liu X. A lifelong journey of lead in soil profiles at an abandoned e-waste recycling site: Past, present, and future. ENVIRONMENTAL POLLUTION (BARKING, ESSEX : 1987) 2023; 320:121097. [PMID: 36657515 DOI: 10.1016/j.envpol.2023.121097] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/18/2022] [Revised: 01/02/2023] [Accepted: 01/15/2023] [Indexed: 06/17/2023]
Abstract
Heavy metal pollutants resulting from human activities consistently move from the topsoil to the subsoil profiles under the influence of rainfall leaching. This study intends to predict the long-term transport of heavy metals at an abandoned e-waste recycling site with respect to historical pollution activities, land use, and metal pollutant dynamics. Our results showed that the site was seriously contaminated with heavy metals (Cd, Cu, Pb, and Zn) in the soil profiles. More specifically, Cu and Zn accumulated primarily in the upper layers of the soil profile owing to their weak mobility, while significant migration of Cd and Pb was observed in the deeper soil layers. Furthermore, to clarify the fate of Pb in soil profiles, Pb isotopes and the Hydrus model were used to trace the sources of Pb contamination and predict its long-term distribution. The Pb isotope results suggest that past e-waste recycling activities significantly contributed to the heavy metal concentration in the soil profiles; however, other anthropogenic sources such as vehicle exhaust had smaller impacts. Moreover, our model findings predicted that within the next 30 years, 60% of Pb contaminants will be concentrated in the surface soil. Together these results provide a theoretical foundation and scientific basis for evaluating, controlling, and remediating abandoned e-waste recycling sites.
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Affiliation(s)
- Yiren Li
- College of Environmental and Resource Sciences, Zhejiang Provincial Key Laboratory of Agricultural Resources and Environment, Zhejiang University, Hangzhou, 310058, China
| | - Yanni Wang
- College of Environmental and Resource Sciences, Zhejiang Provincial Key Laboratory of Agricultural Resources and Environment, Zhejiang University, Hangzhou, 310058, China
| | - Jian Liu
- College of Environmental and Resource Sciences, Zhejiang Provincial Key Laboratory of Agricultural Resources and Environment, Zhejiang University, Hangzhou, 310058, China
| | - Williamson Gustave
- The School of Chemistry, Environmental & Life Sciences, University of the Bahamas, New Providence, Nassau, Bahamas
| | - Lingzao Zeng
- College of Environmental and Resource Sciences, Zhejiang Provincial Key Laboratory of Agricultural Resources and Environment, Zhejiang University, Hangzhou, 310058, China
| | - Jianming Xu
- College of Environmental and Resource Sciences, Zhejiang Provincial Key Laboratory of Agricultural Resources and Environment, Zhejiang University, Hangzhou, 310058, China
| | - Xingmei Liu
- College of Environmental and Resource Sciences, Zhejiang Provincial Key Laboratory of Agricultural Resources and Environment, Zhejiang University, Hangzhou, 310058, China.
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11
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Xu J, Chen Z, Li Y, Dong S, Li L, Long S, Wu Y, Wang S. The changes in the physicochemical properties of calcareous soils and the factors of arsenic (As) uptake by wheat were investigated after the cessation of effluent irrigation for nearly 20 years. THE SCIENCE OF THE TOTAL ENVIRONMENT 2023; 859:160171. [PMID: 36379339 DOI: 10.1016/j.scitotenv.2022.160171] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/23/2022] [Revised: 10/31/2022] [Accepted: 11/09/2022] [Indexed: 06/16/2023]
Abstract
It is not known what the buffering capacity of soils and arsenic (As) enrichment by crops is for calcareous agricultural soils after the end of long-term effluent irrigation. In this study, changes in soil physicochemical properties and factors of influencing As uptake by wheat were investigated in agricultural soils where sewage irrigation had been ceased for nearly 20 years. The results showed that the content of CaCO3 and pH in soil increased compared to the period before the cessation of sewage irrigation, but remained below the soil background value. Furthermore, CaCO3 is by far the main buffering substance in agricultural soils and indirectly contributes to the increase in pH. The As concentration in the soil was 36.4 ± 34.8 mg/kg, which was 0.56-10.28 times and 0.28-5.18 times higher than the soil background and risk screening values, respectively, but showed a decreasing trend. pH and Fe dissolution were the main reasons for the lower As concentration in the soil. Total As in soil was a better predictor of As in wheat, and soil electrical conductivity (EC) and soil organic matter (SOM) promoted As uptake by wheat. The competitive uptake of As by dissolved Si was an important reason for the mismatch between As concentrations in soil and wheat. This study highlighted the key issues of As transport transformation in soil-wheat systems after cessation of effluent irrigation, using agricultural soils, and provided a reference for soil risk management in agricultural soils in mining areas.
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Affiliation(s)
- Jun Xu
- College of Earth and Environmental Sciences, Lanzhou University, Lanzhou 730000, China.
| | - Zhaoming Chen
- College of Earth and Environmental Sciences, Lanzhou University, Lanzhou 730000, China.
| | - Yueyue Li
- College of Earth and Environmental Sciences, Lanzhou University, Lanzhou 730000, China
| | - Suhang Dong
- College of Earth and Environmental Sciences, Lanzhou University, Lanzhou 730000, China
| | - Longrui Li
- College of Earth and Environmental Sciences, Lanzhou University, Lanzhou 730000, China.
| | - Song Long
- College of Earth and Environmental Sciences, Lanzhou University, Lanzhou 730000, China.
| | - Yining Wu
- College of Earth and Environmental Sciences, Lanzhou University, Lanzhou 730000, China.
| | - Shengli Wang
- College of Earth and Environmental Sciences, Lanzhou University, Lanzhou 730000, China.
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12
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Missana T, Alonso U, Mayordomo N, García-Gutiérrez M. Analysis of Cadmium Retention Mechanisms by a Smectite Clay in the Presence of Carbonates. TOXICS 2023; 11:130. [PMID: 36851007 PMCID: PMC9959410 DOI: 10.3390/toxics11020130] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 12/27/2022] [Revised: 01/21/2023] [Accepted: 01/25/2023] [Indexed: 06/18/2023]
Abstract
Cadmium (Cd) is a toxic heavy metal with very low permissible exposure limits and is, thus, a very dangerous pollutant for the environment and public health and is considered by the World Health Organisation as one of the ten chemicals of major public concern. Adsorption onto solid phases and (co)precipitation processes are the most powerful mechanisms to retain pollutants and limit their migration; thus, the understanding of these processes is fundamental for assessing the risks of their presence in the environment. In this study, the immobilisation of Cd by smectite clay has been investigated by batch sorption tests, and the experimental data were interpreted with a thermodynamic model, including cation exchange and surface complexation processes. The model can describe the adsorption of Cd in smectite under a wide range of experimental conditions (pH, ionic strength, and Cd concentration). Under the conditions analysed in this study, the precipitation of otavite (CdCO3) is shown to have a limited contribution to Cd immobilisation.
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Affiliation(s)
- Tiziana Missana
- CIEMAT, Physical Chemistry of Actinides and Fission Products Unit, 28040 Madrid, Spain
| | - Ursula Alonso
- CIEMAT, Physical Chemistry of Actinides and Fission Products Unit, 28040 Madrid, Spain
| | - Natalia Mayordomo
- HZDR, Institute of Resource Ecology, Helmholtz-Zentrum Dresden-Rossendorf, 01328 Dresden, Germany
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Yu H, Li C, Yan J, Ma Y, Zhou X, Yu W, Kan H, Meng Q, Xie R, Dong P. A review on adsorption characteristics and influencing mechanism of heavy metals in farmland soil. RSC Adv 2023; 13:3505-3519. [PMID: 36756568 PMCID: PMC9890661 DOI: 10.1039/d2ra07095b] [Citation(s) in RCA: 7] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/08/2022] [Accepted: 12/31/2022] [Indexed: 01/26/2023] Open
Abstract
The accumulation of heavy metals in soil and crops is considered to be a severe environmental problem due to its various harmful effects on animals and plants. Soil adsorption is an essential characteristic of mud, which is the fundamental reason for soil to have a specific self-purification capacity and environmental capacity for heavy metals. The adsorption of heavy metals by soil reduces the uptake of these pollutants by crops, thereby limiting food contamination. Therefore, the adsorption of heavy metals in crop soils was taken as the primary research object. Based on the entire reading of the literature, the previous research results were compared and discussed from the four aspects of heterogeneity, physical and chemical properties, competitive adsorption, and external factors. The influencing mechanism of heavy metal adsorption characteristics in soil was reviewed. Finally, suggestions and prospects for future research on heavy metal adsorption were put forward.
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Affiliation(s)
- Hanjing Yu
- Faculty of Metallurgical and Energy Engineering, Kunming University of Science and Technology Kunming 650093 China
| | - Chenchen Li
- Faculty of Metallurgical and Energy Engineering, Kunming University of Science and Technology Kunming 650093 China
| | - Jin Yan
- Faculty of Metallurgical and Energy Engineering, Kunming University of Science and Technology Kunming 650093 China
| | - Yaoqiang Ma
- Faculty of Metallurgical and Energy Engineering, Kunming University of Science and Technology Kunming 650093 China
| | - Xinyu Zhou
- Faculty of Metallurgical and Energy Engineering, Kunming University of Science and Technology Kunming 650093 China
| | - Wanquan Yu
- Faculty of Metallurgical and Energy Engineering, Kunming University of Science and Technology Kunming 650093 China
| | - Huiying Kan
- Faculty of Metallurgical and Energy Engineering, Kunming University of Science and Technology Kunming 650093 China
| | - Qi Meng
- Faculty of Metallurgical and Energy Engineering, Kunming University of Science and Technology Kunming 650093 China
| | - Ruosong Xie
- Faculty of Metallurgical and Energy Engineering, Kunming University of Science and Technology Kunming 650093 China
| | - Peng Dong
- Faculty of Metallurgical and Energy Engineering, Kunming University of Science and Technology Kunming 650093 China
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