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Hamid Y, Tang L, Hussain B, Usman M, Lin Q, Rashid MS, He Z, Yang X. Organic soil additives for the remediation of cadmium contaminated soils and their impact on the soil-plant system: A review. THE SCIENCE OF THE TOTAL ENVIRONMENT 2020; 707:136121. [PMID: 31865074 DOI: 10.1016/j.scitotenv.2019.136121] [Citation(s) in RCA: 67] [Impact Index Per Article: 16.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/10/2019] [Revised: 12/11/2019] [Accepted: 12/13/2019] [Indexed: 05/08/2023]
Abstract
Immobilization is among the most-suitable strategies to remediate cadmium (Cd) contaminated sites. Organic additives (OAs) have emerged as highly efficient and environment-friendly immobilizers to eradicate Cd contamination in a wide range of environments. This review article is intended to critically illustrate the role of different OAs in Cd immobilization and to highlight the key findings in this context. Owing to the unique structural features (high surface area, cation exchange capacity (CEC), presence of many functional groups), OAs have shown strong capability to remediate Cd polluted soils by adsorption, electrostatic interaction, complexation and precipitation. Research data is compiled about the efficiency of different OAs (bio-waste, biochar, activated carbon, composts, manure, and plant residues) applied alone or in combination with other amendments in stabilization and renovation of contaminated sites. In addition to their role in remediation, OAs are widely advocated for being classical sources of essential plant nutrients and as agents to improve the soil health and quality which has also been focused in this review. OAs may contain considerable amounts of metals and therefore it becomes essential to assess their final contribution. Elimination of Cd contamination is essential to attenuate the contaminant effect and to produce the safe food. Therefore, deployment of environment-friendly remediation strategies (alone or in combination with other suitable technologies) should be adopted especially at early stages of contamination.
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Affiliation(s)
- Yasir Hamid
- Ministry of Education (MOE) Key Lab of Environ Remediation and Ecol Health, College of Environmental and Resources Science, Zhejiang University, Hangzhou 310058, PR China
| | - Lin Tang
- Ministry of Education (MOE) Key Lab of Environ Remediation and Ecol Health, College of Environmental and Resources Science, Zhejiang University, Hangzhou 310058, PR China
| | - Bilal Hussain
- Ministry of Education (MOE) Key Lab of Environ Remediation and Ecol Health, College of Environmental and Resources Science, Zhejiang University, Hangzhou 310058, PR China
| | - Muhammad Usman
- PEIE Research Chair for the Development of Industrial Estates and Free Zones, Center for Environmental Studies and Research, Sultan Qaboos University, Al-Khoud 123, Oman
| | - Qiang Lin
- Ministry of Education (MOE) Key Lab of Environ Remediation and Ecol Health, College of Environmental and Resources Science, Zhejiang University, Hangzhou 310058, PR China
| | - Muhammad Saqib Rashid
- CAS-Key Laboratory of Crust-Mantle Materials and the Environments, School of Earth and Space Sciences, University of Science and Technology of China, Hefei 230026, PR China
| | - Zhenli He
- Indian River Research and Education Center, Institute of Food and Agricultural Sciences, University of Florida, Fort Pierce, FL 34945, USA
| | - Xiaoe Yang
- Ministry of Education (MOE) Key Lab of Environ Remediation and Ecol Health, College of Environmental and Resources Science, Zhejiang University, Hangzhou 310058, PR China.
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152
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Lei S, Zhu L, Xue C, Hong C, Wang J, Che L, Hu Y, Qiu Y. Mechanistic insights and multiple characterizations of cadmium binding to animal-derived biochar. ENVIRONMENTAL POLLUTION (BARKING, ESSEX : 1987) 2020; 258:113675. [PMID: 31812527 DOI: 10.1016/j.envpol.2019.113675] [Citation(s) in RCA: 20] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/12/2019] [Revised: 11/15/2019] [Accepted: 11/24/2019] [Indexed: 06/10/2023]
Abstract
Cattle-derived biochar (CB), which is derived from industrial pyrolysis of cattle carcasses in harmless treatment plants, is a naturally occurring mineral form of carbonate-bearing hydroxyapatite (CHAP) with a small amount of elemental carbon. CB has 4.02% of carbonate content, which falls under the B-type substitution of CHAP. In this work, the Cd(II) sorption capacity of CB was determined to be 0.82 mmol/g, with 97.6% of the Cd(II) uptake contributing to CHAP and only 2.36% of the Cd(II) uptake contributing to the elemental carbon component. The calculation and linear combination fitting (LCF) of Cd L3-edge X-ray absorption near-edge structure (XANES) analysis indicated that the contributions of Cd(II) species to CB presented the following order: ion exchange (57.6%-61.0%) > precipitation (24.4%-29.9%) > surface complexation (12.5%-13.4%). The depth dependent X-ray photoelectron spectroscopy (XPS) showed the presence of ion exchange, which is accompanied by intraparticle diffusion. LCF of XANES and Rietveld analysis of X-ray diffraction (XRD) demonstrated that Cd(II) was precipitated in the form of Cd5H2(PO4)4·4H2O on the CB surface. Furthermore, the precipitate was directly observed and identified by scanning electron microscopy with energy-dispersive spectroscopy (SEM-EDS). Consequently, we revealed the intricate binding mechanism of Cd(II) to CHAP-rich CB and confirmed the importance of surface precipitation.
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Affiliation(s)
- Sicong Lei
- State Key Laboratory of Pollution Control and Resources Reuse, Ministry of Education Key Laboratory of Yangtze River Water Environment, College of Environmental Science and Engineering, Tongji University, Shanghai, 200092, China; Shanghai Institute of Pollution Control and Ecological Security, International Joint Research Center for Sustainable Urban Water System, Shanghai, 200092, China
| | - Ling Zhu
- State Key Laboratory of Pollution Control and Resources Reuse, Ministry of Education Key Laboratory of Yangtze River Water Environment, College of Environmental Science and Engineering, Tongji University, Shanghai, 200092, China; Shanghai Institute of Pollution Control and Ecological Security, International Joint Research Center for Sustainable Urban Water System, Shanghai, 200092, China
| | - Cong Xue
- State Key Laboratory of Pollution Control and Resources Reuse, Ministry of Education Key Laboratory of Yangtze River Water Environment, College of Environmental Science and Engineering, Tongji University, Shanghai, 200092, China; Shanghai Institute of Pollution Control and Ecological Security, International Joint Research Center for Sustainable Urban Water System, Shanghai, 200092, China
| | - Chengyi Hong
- State Key Laboratory of Pollution Control and Resources Reuse, Ministry of Education Key Laboratory of Yangtze River Water Environment, College of Environmental Science and Engineering, Tongji University, Shanghai, 200092, China
| | - Junliang Wang
- College of the Environment, Zhejiang University of Technology, Hangzhou, 310014, China
| | - Lei Che
- School of Engineering, Huzhou University, Huzhou, 313000, China
| | - Yongfeng Hu
- Canadian Light Source Inc., Saskatoon, SK S7N 2V3, Canada
| | - Yuping Qiu
- State Key Laboratory of Pollution Control and Resources Reuse, Ministry of Education Key Laboratory of Yangtze River Water Environment, College of Environmental Science and Engineering, Tongji University, Shanghai, 200092, China; Shanghai Institute of Pollution Control and Ecological Security, International Joint Research Center for Sustainable Urban Water System, Shanghai, 200092, China.
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153
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Hamid Y, Tang L, Hussain B, Usman M, Rehman Hashmi MLU, Bilal Khan M, Yang X, He Z. Immobilization and sorption of Cd and Pb in contaminated stagnic anthrosols as amended with biochar and manure combined with inorganic additives. JOURNAL OF ENVIRONMENTAL MANAGEMENT 2020; 257:109999. [PMID: 31868649 DOI: 10.1016/j.jenvman.2019.109999] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/22/2019] [Revised: 12/02/2019] [Accepted: 12/12/2019] [Indexed: 06/10/2023]
Abstract
The present study evaluated the efficiency of pre-selected composite amendments (CA-1: biochar-lime-sepiolite-zeolite and CA-2: manure-lime-sepiolite) for immobilization and sorption of Cd and Pb in field and batch sorption experiments. The field experiment was performed in a co-contaminated clay purple soil (stagnic anthrosols). Along with a control experiment (T1), CA-1 and CA-2 were tested at different rates including 750, 1500, 3000 and 6000 kg ha-1 by growing wheat as the test crop. The obtained results revealed that the highest dose of both composites (T5: 6000 kg ha-1 and T9: 6000 kg ha-1) increased the soil pH to 6.85 and 6.81, respectively as compared to the control (5.63). DTPA-extractable Cd and Pb contents decreased with composite treatments (T7 and T4) at harvest stage samples. Metal fractionation depicted that application of amendments decreased the exchangeable fraction at harvesting stage. Application of CA-2 and CA-1 (3000 kg ha-1) significantly increased the plant biomass (by 28% and 24%, respectively) and grain yield (by 26% and 22%, respectively) of wheat. Furthermore, batch sorption experiment results revealed that Langmuir adsorption model better fitted the sorption results with R2 values ranging between 0.99 and 0.91 for Cd and Pb, respectively. CA-1 and CA-2 exhibited the maximum adsorption capacity for Cd with no significant difference among treatments but Pb adsorption capacity was highest in CA-1 followed by CA-2 and control. The results of our experiments revealed that the application of organics combined with inorganic materials enhanced Cd and Pb immobilization and sorption, consequently reducing metals availability in laboratory and field conditions. Moreover, for field trials, application of the composite amendments at 3000 kg ha-1 emerged as the suitable treatment for tested wheat-grown area.
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Affiliation(s)
- Yasir Hamid
- Ministry of Education (MOE) Key Laboratory of Environmental Remediation and Ecosystem Health, College of Environmental and Resources Science, Zhejiang University, Hangzhou, 310058, People's Republic of China
| | - Lin Tang
- Ministry of Education (MOE) Key Laboratory of Environmental Remediation and Ecosystem Health, College of Environmental and Resources Science, Zhejiang University, Hangzhou, 310058, People's Republic of China
| | - Bilal Hussain
- Ministry of Education (MOE) Key Laboratory of Environmental Remediation and Ecosystem Health, College of Environmental and Resources Science, Zhejiang University, Hangzhou, 310058, People's Republic of China
| | - Muhammad Usman
- PEIE Research Chair for the Development of Industrial Estates and Free Zones, Center for Environmental Studies and Research, Sultan Qaboos University, Al-Khoud 123, Oman
| | - Muhammad Laeeq Ur Rehman Hashmi
- Ministry of Education (MOE) Key Laboratory of Environmental Remediation and Ecosystem Health, College of Environmental and Resources Science, Zhejiang University, Hangzhou, 310058, People's Republic of China
| | - Muhammad Bilal Khan
- Ministry of Education (MOE) Key Laboratory of Environmental Remediation and Ecosystem Health, College of Environmental and Resources Science, Zhejiang University, Hangzhou, 310058, People's Republic of China
| | - Xiaoe Yang
- Ministry of Education (MOE) Key Laboratory of Environmental Remediation and Ecosystem Health, College of Environmental and Resources Science, Zhejiang University, Hangzhou, 310058, People's Republic of China.
| | - Zhenli He
- Indian River Research and Education Center, Institute of Food and Agricultural Sciences, University of Florida, Fort Pierce, Florida, 34945, USA
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154
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The Immobilization of Soil Cadmium by the Combined Amendment of Bacteria and Hydroxyapatite. Sci Rep 2020; 10:2189. [PMID: 32041971 PMCID: PMC7010816 DOI: 10.1038/s41598-020-58259-1] [Citation(s) in RCA: 17] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/30/2019] [Accepted: 01/13/2020] [Indexed: 11/25/2022] Open
Abstract
The remediation of heavy metal-contaminated soils has attracted increased attention worldwide. The immobilization of metals to prevent their uptake by plants is an efficient way to remediate contaminated soils. This work aimed to seek the immobilization of cadmium in contaminated soils via a combination method. Flask experiments were performed to investigate the effects of hydroxyapatite (HAP) and the Cupriavidus sp. strain ZSK on soil pH and DTPA-extractable cadmium. Pot experiments were carried out to study the effects of the combined amendment on three plant species. The results showed that HAP has no obvious influence on the growth of the strain. With increasing concentrations of HAP, the soil pH increased, and the DTPA-extractable Cd decreased. Via the combined amendment of the strain and HAP (SH), the DTPA-extractable Cd in the soil decreased by 58.2%. With the combined amendment of the SH, the cadmium accumulation in ramie, dandelion, and daisy decreased by 44.9%, 51.0%, and 38.7%, respectively. Moreover, the combined amendment somewhat benefitted the growth of the three plant species and significantly decreased the biosorption of cadmium. These results suggest that the immobilization by the SH combination is a potential method to decrease the available cadmium in the soil and the cadmium accumulation in plants.
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155
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Hamid Y, Tang L, Hussain B, Usman M, Gurajala HK, Rashid MS, He Z, Yang X. Efficiency of lime, biochar, Fe containing biochar and composite amendments for Cd and Pb immobilization in a co-contaminated alluvial soil. ENVIRONMENTAL POLLUTION (BARKING, ESSEX : 1987) 2020; 257:113609. [PMID: 31761594 DOI: 10.1016/j.envpol.2019.113609] [Citation(s) in RCA: 68] [Impact Index Per Article: 17.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/08/2019] [Revised: 10/15/2019] [Accepted: 11/10/2019] [Indexed: 05/08/2023]
Abstract
Present study reports the laboratory and field scale application of different organic and inorganic amendments to immobilize cadmium (Cd) and lead (Pb) in a co-contaminated alluvial paddy soil. For that purpose, lime, biochar, Fe-biochar and two composite amendments (CA) composed of biochar, lime, sepiolite and zeolite (CA1: composite amendment 1) and manure, lime and sepiolite (CA2: composite amendment 2) were firstly tested in an incubation experiment to ameliorate Cd and Pb co-contaminated alluvial soil. It was observed that liming and CA2 elevated the soil pH and reduced DTPA extractable Cd and Pb in the incubated soil leading to higher metal immobilization. Therefore, efficiency of lime and CA2 was further investigated in field conditions with mid rice as the test crop to evaluate field scale immobilization and precise application rate for the tested soil type. DTPA and CaCl2 extractable Cd (46 and 51%) and Pb (68 and 70%) in field soil were decreased with applied treatments. Speciation of Cd and Pb also promoted conversion of metal exchangeable contents to less-available forms. Activated functional groups on amendments' surface (_OH bonding, C_O and CO, -O-H, Si-O-Si, carboxylic and ester groups) sequestered metals by precipitation, adsorption, ion exchange or electro static attributes. Application of lime at 2400 kg/acre (T4) and CA2 at 1200 kg/acre was more effective in reducing rice shoot and grains metal contents. Moreover, obtained results in terms of pH, extractable content, speciation and yield, and microanalysis of amendments highlights the remarkable efficiency of lime and composite amendment to sorb Cd and Pb providing the key evidence of these amendments for metals immobilization and environmental remediation. Considering these results, lime and CA2 are potential amendments for co-contaminated rice field especially in context of alluvial soil.
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Affiliation(s)
- Yasir Hamid
- Ministry of Education (MOE) Key Laboratory of Environmental Remediation and Ecosystem Health, College of Environmental and Resources Science, Zhejiang University, Hangzhou, 310058, People's Republic of China
| | - Lin Tang
- Ministry of Education (MOE) Key Laboratory of Environmental Remediation and Ecosystem Health, College of Environmental and Resources Science, Zhejiang University, Hangzhou, 310058, People's Republic of China
| | - Bilal Hussain
- Ministry of Education (MOE) Key Laboratory of Environmental Remediation and Ecosystem Health, College of Environmental and Resources Science, Zhejiang University, Hangzhou, 310058, People's Republic of China
| | - Muhammad Usman
- PEIE Research Chair for the Development of Industrial Estates and Free Zones, Center for Environmental Studies and Research, Sultan Qaboos University, Al-Khoud 123, Oman
| | - Hanumanth Kumar Gurajala
- Ministry of Education (MOE) Key Laboratory of Environmental Remediation and Ecosystem Health, College of Environmental and Resources Science, Zhejiang University, Hangzhou, 310058, People's Republic of China
| | - Muhammad Saqib Rashid
- CAS-Key Laboratory of Crust-Mantle Materials and the Environments, School of Earth and Space Sciences, University of Science and Technology of China, Hefei, 230026, PR China
| | - Zhenli He
- Indian River Research and Education Center, Institute of Food and Agricultural Sciences, University of Florida, Fort Pierce, Florida, 34945, USA
| | - Xiaoe Yang
- Ministry of Education (MOE) Key Laboratory of Environmental Remediation and Ecosystem Health, College of Environmental and Resources Science, Zhejiang University, Hangzhou, 310058, People's Republic of China.
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156
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Huang Y, Sheng H, Zhou P, Zhang Y. Remediation of Cd-contaminated acidic paddy fields with four-year consecutive liming. ECOTOXICOLOGY AND ENVIRONMENTAL SAFETY 2020; 188:109903. [PMID: 31706567 DOI: 10.1016/j.ecoenv.2019.109903] [Citation(s) in RCA: 18] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/24/2019] [Revised: 10/28/2019] [Accepted: 10/30/2019] [Indexed: 06/10/2023]
Abstract
Liming has been widely used to remediate Cd-contaminated acidic soils, but the effects of consecutive liming are still unclear. Four-year liming experiments were conducted to assess the remediation of Cd-contaminated acidic paddy fields in a double rice cropping system. With four-year consecutive liming (quicklime, 2.25 t ha-1 per season), the soil pH was increased by an average of 0.57 units (0.10-1.16 units), while the soil DTPA-Cd and available Fe and Mn were reduced by 9%, 19% and 31% (p < 0.05), respectively. The exchangeable plus water-soluble Cd fraction in soil was reduced by 17%, while the soil carbonate-, Fe/Mn oxide- and organic-bound Cd fractions were increased by 23%, 41% and 10% (p < 0.05), respectively. The Cd in rice grain was reduced by 55% for early rice and 63% for late rice (p < 0.05) and in some cases was reduced to below the Chinese allowable limit (0.2 mg kg-1). High annual fluctuations in rice grain Cd could be caused by variations in the field water regime and in rainfall. With consecutive liming, the soil pH, DTPA-Cd and rice grain Cd varied greatly in the first three seasons and then remained relatively less variable. Meanwhile, soil available nutrients (N, P and K) and rice grain yield were little affected by liming. Soil DTPA-Cd linearly decreased with increasing soil pH, while the reduction of Cd in rice grain logarithmically decreased with increasing soil pH and the reduction in soil DTPA-Cd in the heading stage, indicating potential implications for forecasting rice grain Cd content. Therefore, consecutive liming with quicklime can be recommended for the remediation of Cd-contaminated acidic paddy fields, though supplementary measures are still necessary.
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Affiliation(s)
- Yong Huang
- College of Resources & Environment, Hunan Agricultural University, Changsha, 410128, China
| | - Hao Sheng
- College of Resources & Environment, Hunan Agricultural University, Changsha, 410128, China.
| | - Ping Zhou
- Key Laboratory of Agro-ecological Processes in the Subtropical Region, Institute of Subtropical Agriculture, The Chinese Academy of Sciences, Changsha, 410125, China
| | - Yangzhu Zhang
- College of Resources & Environment, Hunan Agricultural University, Changsha, 410128, China
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157
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Radziemska M, Bęś A, Gusiatin ZM, Cerdà A, Jeznach J, Mazur Z, Brtnický M. Assisted phytostabilization of soil from a former military area with mineral amendments. ECOTOXICOLOGY AND ENVIRONMENTAL SAFETY 2020; 188:109934. [PMID: 31740234 DOI: 10.1016/j.ecoenv.2019.109934] [Citation(s) in RCA: 12] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/06/2019] [Revised: 10/19/2019] [Accepted: 11/08/2019] [Indexed: 06/10/2023]
Abstract
Due to the presence of toxic pollutants, soils in former military areas need remedial actions with environmentally friendly methods. Greenhouse experiments were conducted to investigate the aided phytostabilization of multi-heavy metals (HMs), i.e. Cd, Cr, Cu, Ni, Pb, Zn, in post-military soil by Festuca rubra and three mineral amendments (diatomite, dolomite and halloysite). The amendments were applied at 0 and 3.0% to each pot filled with 5 kg of polluted soil. After seven weeks of the phytostabilization, selected soil properties, biomass yield of F. rubra and immobilization of HMs by their accumulation in plant and redistribution among individual fractions in soil were determined. In addition, ecotoxicology parameters of non-amended and amended soil were established using Phytotoxkit (Sinapsis alba) and Ostracodtoxkit (Heterocypris incongruens) tests. The addition of halloysite significantly increased F. rubra biomass. Diatomite significantly increased both the Cd, Cu, Pb and Cr concentrations in the roots and the pH of the soil. The application of halloysite significantly decreased the Cd and Zn contents of the soil after the completion of the experiment. Dolomite and halloysite were more effective in HM immobilization in soil by decreasing their content in an exchangeable fraction than diatomite. These soil amendments significantly differentiated the length of S. alba roots and had a positive effect on the development of H. incongruens.
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Affiliation(s)
- Maja Radziemska
- Faculty of Civil and Environmental Engineering, Warsaw University of Life Sciences, Nowoursynowska 159, 02-776, Warsaw, Poland.
| | - Agnieszka Bęś
- Faculty of Environmental Management and Agriculture, University of Warmia and Mazury in Olsztyn, Pl. Łódzki 4, 10-727, Olsztyn, Poland
| | - Zygmunt M Gusiatin
- Faculty of Environmental Sciences, University of Warmia and Mazury in Olsztyn, Słoneczna St. 45G, 10-719, Olsztyn, Poland
| | - Artemi Cerdà
- Soil Erosion and Degradation Research Group, Department of Geography, University of Valencia, Blasco Ibañez 28, Valencia, 46 010, Spain
| | - Jerzy Jeznach
- Faculty of Civil and Environmental Engineering, Warsaw University of Life Sciences, Nowoursynowska 159, 02-776, Warsaw, Poland
| | - Zbigniew Mazur
- Faculty of Environmental Management and Agriculture, University of Warmia and Mazury in Olsztyn, Pl. Łódzki 4, 10-727, Olsztyn, Poland
| | - Martin Brtnický
- Faculty of Forestry and Wood Technology, Mendel University in Brno, Zemědělská 1/1665, 613-00, Brno, Czech Republic; Central European Institute of Technology, Brno University of Technology, Purkyňova 656/123, 612-00, Brno, Czech Republic
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158
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Abbas Q, Liu G, Yousaf B, Ali MU, Ullah H, Mujtaba Munir MA, Ahmed R, Rehman A. Biochar-assisted transformation of engineered-cerium oxide nanoparticles: Effect on wheat growth, photosynthetic traits and cerium accumulation. ECOTOXICOLOGY AND ENVIRONMENTAL SAFETY 2020; 187:109845. [PMID: 31654865 DOI: 10.1016/j.ecoenv.2019.109845] [Citation(s) in RCA: 14] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/03/2019] [Revised: 10/18/2019] [Accepted: 10/19/2019] [Indexed: 06/10/2023]
Abstract
The extensive use of nano-fabricated products in daily life is releasing a large volume of engineered nanoparticles (ENPs) in the environment having unknown consequences. Meanwhile, little efforts have been paid to immobilize and prevent the entry of these emerging contaminants in the food chain through plant uptake. Herein, we investigated the biochar role in cerium oxide nanoparticles (CeO2NPs) bioaccumulation and subsequent translocation in wheat (Triticum aestivum L.) as well as impact on growth, photosynthesis and gas-exchange related physiological parameters. Results indicated that CeO2NPs up to 500 mg L-1 level promoted the plant growth by triggering photosynthesis, transpiration and stomatal conductance. Higher NPs concentration (2000 mg CeO2NPs L-1) has negatively affected the plant growth and photosynthesis related processes. Conversely, biochar amendment with CeO2NPs considerably reduced (~9 folds) the plants accumulated contents of Ce even at 2000 mg L-1 exposure level of CeO2NPs through surface complexation process and alleviated the phyto-toxic effects of NPs on plant growth. XPS and FTIR analysis confirmed the role of biochar-mediated carboxylate and hydroxyl groups bonding with CeO2NPs. These findings provides an inside mechanistic understanding about biochar interaction with nano-pollutants to inhibit their bioavailability to plant body.
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Affiliation(s)
- Qumber Abbas
- CAS-Key Laboratory of Crust-Mantle Materials and the Environments, School of Earth and Space Sciences, University of Science and Technology of China, Hefei, 230026, PR China; State Key Laboratory of Loess and Quaternary Geology, Institute of Earth Environment, The Chinese Academy of Sciences, Xi'an, Shaanxi, 710075, PR China.
| | - Guijian Liu
- CAS-Key Laboratory of Crust-Mantle Materials and the Environments, School of Earth and Space Sciences, University of Science and Technology of China, Hefei, 230026, PR China; State Key Laboratory of Loess and Quaternary Geology, Institute of Earth Environment, The Chinese Academy of Sciences, Xi'an, Shaanxi, 710075, PR China.
| | - Balal Yousaf
- CAS-Key Laboratory of Crust-Mantle Materials and the Environments, School of Earth and Space Sciences, University of Science and Technology of China, Hefei, 230026, PR China; State Key Laboratory of Loess and Quaternary Geology, Institute of Earth Environment, The Chinese Academy of Sciences, Xi'an, Shaanxi, 710075, PR China.
| | - Muhammad Ubaid Ali
- CAS-Key Laboratory of Crust-Mantle Materials and the Environments, School of Earth and Space Sciences, University of Science and Technology of China, Hefei, 230026, PR China.
| | - Habib Ullah
- CAS-Key Laboratory of Crust-Mantle Materials and the Environments, School of Earth and Space Sciences, University of Science and Technology of China, Hefei, 230026, PR China.
| | - Mehr Ahmed Mujtaba Munir
- CAS-Key Laboratory of Crust-Mantle Materials and the Environments, School of Earth and Space Sciences, University of Science and Technology of China, Hefei, 230026, PR China.
| | - Rafay Ahmed
- CAS-Key Laboratory of Crust-Mantle Materials and the Environments, School of Earth and Space Sciences, University of Science and Technology of China, Hefei, 230026, PR China.
| | - Abdul Rehman
- CAS-Key Laboratory of Crust-Mantle Materials and the Environments, School of Earth and Space Sciences, University of Science and Technology of China, Hefei, 230026, PR China.
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159
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Shah AA, Ahmed S, Yasin NA. 24-epibrassinolide triggers cadmium stress mitigation in Cucumis sativus through intonation of antioxidant system. SOUTH AFRICAN JOURNAL OF BOTANY 2019; 127:349-360. [DOI: 10.1016/j.sajb.2019.11.003] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/16/2023]
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160
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Huang H, Rizwan M, Li M, Song F, Zhou S, He X, Ding R, Dai Z, Yuan Y, Cao M, Xiong S, Tu S. Comparative efficacy of organic and inorganic silicon fertilizers on antioxidant response, Cd/Pb accumulation and health risk assessment in wheat (Triticum aestivum L.). ENVIRONMENTAL POLLUTION (BARKING, ESSEX : 1987) 2019; 255:113146. [PMID: 31522001 DOI: 10.1016/j.envpol.2019.113146] [Citation(s) in RCA: 51] [Impact Index Per Article: 10.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/17/2019] [Revised: 08/27/2019] [Accepted: 08/29/2019] [Indexed: 05/29/2023]
Abstract
In wheat production areas of China, soil lead (Pb) pollution is generally accompanied by cadmium (Cd) pollution and it is of considerable significance in repairing the Cd and Pb co-contaminated soils for safe agronomic production. Organosilicon fertilizer (OSiF) is a new type of silicon (Si) fertilizer that can effectively alleviate heavy metal toxicity in plants, but the mechanisms on its heavy metal detoxification are poorly understood. A soil pot experiment was conducted to evaluate and compare the effects of two OSiFs (OSiFA and OSiFB) and an inorganic silicon fertilizer (InOSiF) on wheat heavy metal uptake and biochemical parameters in a Cd and Pb co-contaminated soil. The results demonstrated that OSiFA, OSiFB and InOSiF could alleviate the Cd and Pb toxicity of wheat, as indicated by increasing wheat grain yield by 65%, 45% and 22%, respectively. The Si fertilizers enhanced leaf gas exchange attributes and chlorophyll content, whereas diminished the oxidative damage, as indicated by a lower level of hydrogen peroxide (H2O2) and malondialdehyde (MDA) content, and lower activity of superoxide dismutase (SOD) and catalase (CAT) activity, as compared with control. Adding OSiFA, OSiFB and InOSiF increased Si uptake in roots and shoots, thus reducing Cd and Pb accumulation in the wheat shoot, bran and flour, especially, flour Cd contents by 17%, 10% and 31% respectively, flour Pb contents by 74%, 53% and 48% respectively. Also, Si fertilizers application decreased the health risk index (HRI) of both Cd and Pb. The grey correlation degrees of OSiFA, OSiFB and InOSiF are 0.72, 0.77 and 0.61, respectively, indicating that the effects of OSiFs on detoxifying Cd and Pb could be better than that of InOSiF in wheat. Thus, the use of OSiFs might be a feasible approach to reduce Cd and Pb entry into the human body through crops.
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Affiliation(s)
- Hengliang Huang
- College of Resources and Environment, Huazhong Agricultural University, Wuhan, 430070, China; Hubei Research Center for Soil Remediation Engineering, Wuhan, 430070, China
| | - Muhammad Rizwan
- College of Resources and Environment, Huazhong Agricultural University, Wuhan, 430070, China; Hubei Research Center for Soil Remediation Engineering, Wuhan, 430070, China
| | - Mei Li
- College of Plant Science and Technology, Huazhong Agricultural University, Wuhan, 430070, China
| | - Furu Song
- Hebei Silicon Valley Academy of Agricultural Sciences, Handan, 057151, China
| | - Sijiang Zhou
- College of Resources and Environment, Huazhong Agricultural University, Wuhan, 430070, China; Hubei Research Center for Soil Remediation Engineering, Wuhan, 430070, China
| | - Xuan He
- College of Resources and Environment, Huazhong Agricultural University, Wuhan, 430070, China; Hubei Research Center for Soil Remediation Engineering, Wuhan, 430070, China
| | - Rui Ding
- College of Resources and Environment, Huazhong Agricultural University, Wuhan, 430070, China; Hubei Research Center for Soil Remediation Engineering, Wuhan, 430070, China
| | - Zhihua Dai
- College of Resources and Environment, Huazhong Agricultural University, Wuhan, 430070, China; Hubei Research Center for Soil Remediation Engineering, Wuhan, 430070, China
| | - Yuan Yuan
- College of Resources and Environment, Huazhong Agricultural University, Wuhan, 430070, China; Hubei Research Center for Soil Remediation Engineering, Wuhan, 430070, China
| | - Menghua Cao
- College of Resources and Environment, Huazhong Agricultural University, Wuhan, 430070, China; Hubei Research Center for Soil Remediation Engineering, Wuhan, 430070, China
| | - Shuanglian Xiong
- College of Resources and Environment, Huazhong Agricultural University, Wuhan, 430070, China; Hubei Research Center for Soil Remediation Engineering, Wuhan, 430070, China
| | - Shuxin Tu
- College of Resources and Environment, Huazhong Agricultural University, Wuhan, 430070, China; Hubei Research Center for Soil Remediation Engineering, Wuhan, 430070, China.
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161
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Ramtahal G, Umaharan P, Hanuman A, Davis C, Ali L. The effectiveness of soil amendments, biochar and lime, in mitigating cadmium bioaccumulation in Theobroma cacao L. THE SCIENCE OF THE TOTAL ENVIRONMENT 2019; 693:133563. [PMID: 31362218 DOI: 10.1016/j.scitotenv.2019.07.369] [Citation(s) in RCA: 33] [Impact Index Per Article: 6.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/17/2019] [Revised: 07/12/2019] [Accepted: 07/22/2019] [Indexed: 06/10/2023]
Abstract
Cocoa (Theobroma cacao L.) is an important neotropical tree crop grown for its seeds or beans used in global chocolate and confectionary industries. Following studies showing ill effects of long-term dietary exposure of cadmium (Cd) on human health, a number of countries including the European Union (EU) have developed stringent regulations to protect consumers from exposure to cadmium. Cocoa is capable of bioaccumulating Cd in the cocoa beans when grown in soils high in cadmium and hence livelihood of cocoa farmers can be at risk if methods to mitigate the bioaccumulation of Cd are not developed. In vitro, greenhouse and field experiments were established with four, three and three replications respectively to evaluate the effectiveness of soil amendments, biochar and lime, at various application rates (0, 0.5×, 1×, 1.5× and 2× of the recommended rate), on soil pH, Cd phytoavailability and Cd bioaccumulation in Theobroma cacao L. For the in vitro study, Cd-containing soil was amended with 5 levels of biochar and lime, while for the greenhouse and field study four application rates were tested. The study showed that while lower rates were effective under in vitro conditions as you progressed from in vitro to greenhouse to field conditions the application rates and application frequency had to be increased, as the effectiveness and longevity of the treatments were compromised by environmental factors. Our study implies that the two amendments were complementary in their action and can be used in the recommended rated to reduce Cd bioaccumulation. However further studies are required on the placement of amendments to improve their effectiveness and longevity particularly under field conditions.
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Affiliation(s)
- Gideon Ramtahal
- Cocoa Research Centre, The University of the West Indies, St. Augustine, Trinidad and Tobago.
| | - Pathmanathan Umaharan
- Cocoa Research Centre, The University of the West Indies, St. Augustine, Trinidad and Tobago
| | - Anand Hanuman
- Cocoa Research Centre, The University of the West Indies, St. Augustine, Trinidad and Tobago
| | - Carisa Davis
- Cocoa Research Centre, The University of the West Indies, St. Augustine, Trinidad and Tobago
| | - Leon Ali
- Cocoa Research Centre, The University of the West Indies, St. Augustine, Trinidad and Tobago
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162
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Inkham R, Kijjanapanich V, Huttagosol P, Kijjanapanich P. Low-cost alkaline substances for the chemical stabilization of cadmium-contaminated soils. JOURNAL OF ENVIRONMENTAL MANAGEMENT 2019; 250:109395. [PMID: 31473398 DOI: 10.1016/j.jenvman.2019.109395] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/31/2019] [Revised: 08/07/2019] [Accepted: 08/12/2019] [Indexed: 06/10/2023]
Abstract
Owing to poor waste management in zinc mining, toxic heavy metals, particularly cadmium, are released and contaminate the surrounding agricultural areas. Waterlogging, which is a common practice in rice vegetation, creates anaerobic conditions that result in the conversion of organic matter into acetic acid and the reducing phase. This accelerates the release of cadmium into the water, where it is absorbed into the cells of rice. Chemical stabilization methods can be used to treat cadmium-contaminated soil by reacting an alkaline substance with acetic acid and increasing the soil pH for cadmium immobilization. However, to date, few studies using limestone dust and corncob fly ash have been conducted, and no studies have focused on the neutralization of the produced acetic acid in the anaerobic zone of the soil. This study aims to determine the optimum conditions for cadmium stabilization using different types of low-cost alkaline substances (lime, limestone dust, and corncob fly ash). The effects of alkaline amount, soil moisture content, and reaction time on soil stabilization were investigated. Lime was the most suitable for stabilization among the tested alkaline substances, and increasing the amount of lime can effectively reduce the amount of exchangeable cadmium. At 25% w/w of lime/soil, the exchangeable cadmium can be reduced from 29.3 to 7.8 mg kg-1. The stabilization efficiencies of limestone dust and corncob fly ash were much lower. The statistical analysis shows that the amount of alkaline substance is the main factor affecting the stabilization performance at a 95% confidence limit for all tested alkalines.
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Affiliation(s)
- Ratchada Inkham
- Department of Environmental Engineering, Faculty of Engineering, Chiang Mai University, Chiang Mai 50200, Thailand
| | - Vililuck Kijjanapanich
- Department of Environmental Engineering, Faculty of Engineering, Chiang Mai University, Chiang Mai 50200, Thailand
| | - Panlop Huttagosol
- Department of Mining Engineering and Petroleum, Faculty of Engineering, Chiang Mai University, Chiang Mai 50200, Thailand
| | - Pimluck Kijjanapanich
- Department of Environmental Engineering, Faculty of Engineering, Chiang Mai University, Chiang Mai 50200, Thailand; Center of Excellence in Materials Science and Technology, Chiang Mai University, Chiang Mai 50200, Thailand.
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163
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Zhang Z, Yuan L, Qi S, Yin X. The threshold effect between the soil bioavailable molar Se:Cd ratio and the accumulation of Cd in corn (Zea mays L.) from natural Se-Cd rich soils. THE SCIENCE OF THE TOTAL ENVIRONMENT 2019; 688:1228-1235. [PMID: 31726553 DOI: 10.1016/j.scitotenv.2019.06.331] [Citation(s) in RCA: 42] [Impact Index Per Article: 8.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/11/2019] [Revised: 05/22/2019] [Accepted: 06/21/2019] [Indexed: 05/10/2023]
Abstract
There is little available information about the important interactions between selenium and cadmium (Se-Cd) in crops grown on natural Se-Cd rich soils. We investigated their interactive effects on the translocation and uptake of Se and Cd from soils to crops. Corn (Zea mays L.) roots, stems, leaves, and grains, and their corresponding rhizosphere soils were collected from naturally Se-Cd rich areas in Wumeng Mountain, Guizhou, China. The Se and Cd levels were determined in the soils, roots, stems, leaves, and grains. Soil bioavailable Se and Cd were also determined. The low soil bioavailable molar ratios for Se and Cd (Se:Cd) (≤0.7) improved Cd accumulation in the plants. However, relatively high Se:Cd molar ratios (>0.7) in the soils prevented Cd from entering the plants, but the effect of the soil Se:Cd on Se accumulation in corn was not significant. The strong anion exchange-high performance liquid chromatography-inductively coupled plasma mass spectroscopy (SAX-HPLC-ICP-MS) chromatograms showed that Se-Cd complexes occurred in the leaves, which likely indicated that direct interactions between Se and Cd happened there. The results suggested that thresholds for soil bioavailable Se:Cd molar ratios played a role in the interaction between Se and Cd in corn under natural conditions.
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Affiliation(s)
- Zezhou Zhang
- State Key Laboratory of Biogeology and Environmental Geology, China University of Geosciences, Wuhan, China
| | - Linxi Yuan
- Agricultural College of Yangzhou University, Yangzhou, China; Jiangsu Bio-Engineering Research Centre of Selenium, Suzhou, China.
| | - Shihua Qi
- State Key Laboratory of Biogeology and Environmental Geology, China University of Geosciences, Wuhan, China
| | - Xuebin Yin
- Key Laboratory of Functional Agriculture, Suzhou Institute for Advanced Study, University of Science and Technology of China, Suzhou, China
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164
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Aslam SN, Huber C, Asimakopoulos AG, Steinnes E, Mikkelsen Ø. Trace elements and polychlorinated biphenyls (PCBs) in terrestrial compartments of Svalbard, Norwegian Arctic. THE SCIENCE OF THE TOTAL ENVIRONMENT 2019; 685:1127-1138. [PMID: 31390703 DOI: 10.1016/j.scitotenv.2019.06.060] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/28/2019] [Revised: 05/07/2019] [Accepted: 06/04/2019] [Indexed: 06/10/2023]
Abstract
Despite being a remote location, the Arctic is a major receptor for anthropogenic pollution transported from the mid-latitudes. Vegetation and underlying organic soils in the Norwegian Arctic, Svalbard were used to study the occurrences of polychlorinated biphenyls (PCBs) and trace elements. In this study, current concentrations of PCBs and trace elements, namely, Al, As, Cd, Cr, Cu, Fe, Hg, Mn, Ni, Pb, S, Sb, U and Zn in the terrestrial compartments of Svalbard are presented. Samples were collected from Adventdalen near Longyearbyen and from areas in proximity to Ny-Ålesund. There was significant variability in soil organic matter (SOM) among the soils analysed (5.0%-72.1%), with the highest values detected in Ny-Ålesund. The concentrations of Al, As, Cr Cu, Fe, Pb and Ni were associated with the geology of the local bedrock. The concentrations of all elements, except for Cd, Hg and Zn, were higher in soils than those in the overlying vegetation layers. Mean concentrations of ∑PCBs were significantly higher in vegetation (6.90 ± 0.81 ng g-1 dw) than the underlying organic soils (3.70 ± 0.36 ng g-1 dw). An inverse correlation of PCBs with the elements originating from the local bedrock indicated that their concentrations were potentially impacted by atmospheric deposition. PCBs and Cd were strongly associated, proposing a potential concomitant source of origin in Svalbard. Concentrations of PCBs and trace elements measured herein were below the proposed guidelines for Norwegian soil quality.
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Affiliation(s)
- Shazia N Aslam
- Department of Chemistry, NTNU, Norwegian University of Science and Technology, Trondheim 7491, Norway.
| | - Carolin Huber
- Department of Chemistry, NTNU, Norwegian University of Science and Technology, Trondheim 7491, Norway
| | | | - Eiliv Steinnes
- Department of Chemistry, NTNU, Norwegian University of Science and Technology, Trondheim 7491, Norway
| | - Øyvind Mikkelsen
- Department of Chemistry, NTNU, Norwegian University of Science and Technology, Trondheim 7491, Norway
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165
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Xia Y, Liu H, Guo Y, Liu Z, Jiao W. Immobilization of heavy metals in contaminated soils by modified hydrochar: Efficiency, risk assessment and potential mechanisms. THE SCIENCE OF THE TOTAL ENVIRONMENT 2019; 685:1201-1208. [PMID: 31390710 DOI: 10.1016/j.scitotenv.2019.06.288] [Citation(s) in RCA: 37] [Impact Index Per Article: 7.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/14/2019] [Revised: 06/10/2019] [Accepted: 06/19/2019] [Indexed: 06/10/2023]
Abstract
The modified hydrochar was prepared by a facile one-pot lime-assisted hydrothermal synthesis approach and the modified hydrochar and pristine hydrochar were investigated to immobilize the heavy metals (HMs) of Pb and Cd in contaminated soils. The results showed that the modified hydrochar exerted significantly enhanced effectiveness in immobilizing Pb and Cd comparing to pristine hydrochar, resulting from the increased surface functionality and non-crystalline properties, increased pH value and enhanced electronegativity of hydrochar. By introduction with 5% modified hydrochar, the contaminated soils showed the highest value of 34.5% (Pb) and 8.1% (Cd) reductions in leaching toxicity, and significant improvements of 95.1% (Pb) and 64.4% (Cd) were observed. In addition, the concentrations of acid soluble fraction were remarkably reduced by 54.0% (Pb) and 27.0% (Cd), and the reductions were much higher than that of 29.5% (Pb) and 8.3% (Cd) for 5% pristine hydrochar treatment. The enhanced surface complexation, precipitation and cation-π interaction played an important role in the immobilization of HMs in soils. The present study offered a novel and cost-effective approach to prepare soil amendment from waste biomass towards HMs immobilization in contaminated soils.
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Affiliation(s)
- Yu Xia
- Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, China; University of Chinese Academy of Sciences, Beijing 100049, China
| | - Hongjun Liu
- Key Laboratory of Natural Medicine and Immuno-Engineering of Henan Province, Henan University, Kaifeng, Henan 475004, China; Water Technology Research Center, AGplus Technologies Co., Ptd, 303 Longhai Er Road, West Zone, Dayawan, Huizhou, Guangdong 516082, China
| | - Yanchuan Guo
- University of Chinese Academy of Sciences, Beijing 100049, China; Key Laboratory of Photochemical Conversion and Optoelectronic Material, Technical Institute of Physics and Chemistry, Chinese Academy of Sciences, Beijing 100190, China
| | - Zhengang Liu
- Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, China; University of Chinese Academy of Sciences, Beijing 100049, China.
| | - Wentao Jiao
- Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, China; University of Chinese Academy of Sciences, Beijing 100049, China.
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166
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Yuan Z, Luo T, Liu X, Hua H, Zhuang Y, Zhang X, Zhang L, Zhang Y, Xu W, Ren J. Tracing anthropogenic cadmium emissions: From sources to pollution. THE SCIENCE OF THE TOTAL ENVIRONMENT 2019; 676:87-96. [PMID: 31029903 DOI: 10.1016/j.scitotenv.2019.04.250] [Citation(s) in RCA: 58] [Impact Index Per Article: 11.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/21/2019] [Revised: 04/12/2019] [Accepted: 04/16/2019] [Indexed: 05/28/2023]
Abstract
Cadmium (Cd), a widely concerned heavy metal, is toxic to humans and ecosystems. In this paper, a Cd-polluted town in southeast China was selected to estimate the Cd emissions of human activities into surface water, soil and atmospheric environment. The analysis shows that the total amount of Cd emitted into the environment in 2015 was approximately 43.5 kg, and the majority of those emissions were discharged into the water, accounting for approximately 90.4% of the total Cd emissions. The remaining Cd emissions into the soil and atmosphere accounted for 9.5% and 0.1%, respectively. The industrial production (IP) is the dominant source of anthropogenic Cd emissions, which contributes to 62.1% of the total emissions. The other contributors include aquaculture (AQ), wastewater treatment (WT), living consumption (LC), crop farming (CF) and animal breeding (AB); each accounted for less than 10% of the total emissions. Pigment production is the largest source of IP emissions. According to the results of correlation analysis, the pigment enterprises are responsible for the heavy Cd pollution in local soil. By comparing the spatial position and combing with the local watercourses, the study reveals that the irrigated watercourse is the transmission channels of soil Cd pollution. This study contributes to the analysis of connecting the emission inventory, environmental media and transmission channels of the heavy metal Cd and provides policy supports for the local governments to adopt a life cycle Cd management approach.
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Affiliation(s)
- Zengwei Yuan
- State Key Laboratory of Pollution Control and Resource Reuse, School of the Environment, Nanjing University, Nanjing 210023, PR China.
| | - Tao Luo
- State Key Laboratory of Pollution Control and Resource Reuse, School of the Environment, Nanjing University, Nanjing 210023, PR China
| | - Xuewei Liu
- State Key Laboratory of Pollution Control and Resource Reuse, School of the Environment, Nanjing University, Nanjing 210023, PR China
| | - Hui Hua
- State Key Laboratory of Pollution Control and Resource Reuse, School of the Environment, Nanjing University, Nanjing 210023, PR China
| | - Yujie Zhuang
- State Key Laboratory of Pollution Control and Resource Reuse, School of the Environment, Nanjing University, Nanjing 210023, PR China
| | - Xuehua Zhang
- Lishui Institute of Ecological Environment, Nanjing University, Nanjing 211200, PR China
| | - Ling Zhang
- College of Economics and Management, Nanjing Forestry University, Nanjing 210037, PR China
| | - You Zhang
- State Key Laboratory of Pollution Control and Resource Reuse, School of the Environment, Nanjing University, Nanjing 210023, PR China
| | - Weiwei Xu
- Geological Survey of Jiangsu Province, Nanjing 210018, PR China
| | - Jinghua Ren
- Geological Survey of Jiangsu Province, Nanjing 210018, PR China
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