Response of soil heavy metal forms and bioavailability to the application of microplastics across five years in different soil types.

Autor: Jiang W; Xianghu Laboratory, Hangzhou 311231, China; College of Agricultural, Nanjing Agricultural University, Nanjing 210095, China. Electronic address: jiangwei@xhlab.ac.cn., Wang Z; School of Geographical Sciences, Fujian Normal University, Fuzhou 350007, China., Xiao H; School of Geographical Sciences, Fujian Normal University, Fuzhou 350007, China., Abou-Elwafa SF; Agronomy Department, Faculty of Agriculture, Assiut University, Assiut 71526, Egypt., Alshehri MA; Department of Biology, Faculty of Science, University of Tabuk, Tabuk 71491, Saudi Arabia., Wu Y; School of Nursing and Midwifery, Western Sydney University, Penrith, NSW 2751, Australia., Yu H; Plant Protection Research Institute, Guangdong Academy of Agricultural Sciences, Key Laboratory of Green Prevention and Control on Fruits and Vegetables in South China Ministry of Agriculture and Rural Affairs, Guangdong Provincial Key Laboratory of High Technology for Plant Protection, Guangzhou 510640, China; State Key Laboratory of Environmental Criteria and Risk Assessment, Chinese Research Academy of Environmental Sciences, Beijing 100012, China. Electronic address: yhanxia@126.com., Tan W; State Key Laboratory of Environmental Criteria and Risk Assessment, Chinese Research Academy of Environmental Sciences, Beijing 100012, China. Electronic address: wenbingtan@126.com.
Jazyk: angličtina
Zdroj: Journal of hazardous materials [J Hazard Mater] 2024 Dec 05; Vol. 480, pp. 136068. Date of Electronic Publication: 2024 Oct 05.
DOI: 10.1016/j.jhazmat.2024.136068
Abstrakt: Microplastics (MPs) potentially alter physicochemical and transformation of heavy metals (HMs) in soils, which may depend on the specific characteristics of soil types. However, the dynamical and long-term mechanisms remain to be elucidated. A five-year incubation experiment was conducted to evaluate the influence of MPs on the chemical speciation of Pb, Ni, Cu, Cr, Cd, and As in the meadow, tidal, cinnamon, saline-alkali, and brown soils. From the first year to the fifth year, the clay value of the meadow, tidal, cinnamon, and saline-alkali soils was increased by 31.35 %, 9.63 %, 30.12 %, and 33.12 %, respectively; the pH values of the cinnamon and saline-alkali soils were increased by 15.02 % and 15.86 %, respectively. Besides, speciation distribution results suggested that the application of MPs reduced the liable available (LB) form (F2-dissolved and F3-ion exchangeable) of HMs and increased the potentially available (PB) form (F5-minerals and F6-organic-bound fraction) of HMs in all soils. Compared with other forms, F2 HMs fraction was the most responsive to MPs. Furthermore, the average bioconcentration factor (BCF) of Cr and Pb decreased by 73.75 % and 70.41 % in soils, respectively. Interestingly, soil type showed more impact on the form of HMs, which was associated with the different physicochemical parameters of soils, while application time displayed more impact on the bioavailability of HMs. Moreover, our results suggested that soils with higher clay content and pH values (such as cinnamon and saline-alkali soils) may mitigate the bioavailability of HMs more effectively in the presence of MPs, while soils with lower clay content may be more vulnerable to HMs contamination over time. This work highlights the importance of long-term monitoring of the impact of MPs on HMs dynamics for effective mitigation of soil contamination risks. Our study provides valuable guidance for soil remediation strategies and environmental quality management across different soil types.
Competing Interests: Declaration of Competing Interest The authors declare that they have no known competing financial interests or personal relationships that could have appeared to influence the work reported in this paper.
(Copyright © 2024 Elsevier B.V. All rights reserved.)
Databáze: MEDLINE
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