Influences of microplastics types and size on soil properties and cadmium adsorption in paddy soil after one rice season

Qiuyue Zhang; Wenjing Guo; Bingyu Wang; Yuanyuan Feng; Lanfang Han; Chuang Zhang; Huifang Xie; Xiaoyu Liu; Yanfang Feng

Resources, Environment and Sustainability (Mar 2023)

Influences of microplastics types and size on soil properties and cadmium adsorption in paddy soil after one rice season

Qiuyue Zhang,
Wenjing Guo,
Bingyu Wang,
Yuanyuan Feng,
Lanfang Han,
Chuang Zhang,
Huifang Xie,
Xiaoyu Liu,
Yanfang Feng

Affiliations

Qiuyue Zhang: Jiangsu Key Laboratory of Chemical Pollution Control and Resources Reuse, School of Environmental and Biological Engineering, Nanjing University of Science and Technology, Nanjing 210094, China; Key Laboratory of Agro-Environment in Downstream of Yangtze Plain, National Agricultural Experiment Station for Agricultural Environment, Ministry of Agriculture and Rural Affairs, Institute of Agricultural Resources and Environment, Jiangsu Academy of Agricultural Sciences, Nanjing 210014, China
Wenjing Guo: Key Laboratory of Agro-Environment in Downstream of Yangtze Plain, National Agricultural Experiment Station for Agricultural Environment, Ministry of Agriculture and Rural Affairs, Institute of Agricultural Resources and Environment, Jiangsu Academy of Agricultural Sciences, Nanjing 210014, China
Bingyu Wang: Jiangsu Key Laboratory of Chemical Pollution Control and Resources Reuse, School of Environmental and Biological Engineering, Nanjing University of Science and Technology, Nanjing 210094, China
Yuanyuan Feng: Key Laboratory of Agro-Environment in Downstream of Yangtze Plain, National Agricultural Experiment Station for Agricultural Environment, Ministry of Agriculture and Rural Affairs, Institute of Agricultural Resources and Environment, Jiangsu Academy of Agricultural Sciences, Nanjing 210014, China
Lanfang Han: Guangdong Provincial Key Laboratory of Water Quality Improvement and Ecological Restoration for Watersheds, Institute of Environmental and Ecological Engineering, Guangdong University of Technology, Guangzhou 510006, China
Chuang Zhang: Jiangsu Key Laboratory of Chemical Pollution Control and Resources Reuse, School of Environmental and Biological Engineering, Nanjing University of Science and Technology, Nanjing 210094, China
Huifang Xie: Jiangsu Key Laboratory of Chemical Pollution Control and Resources Reuse, School of Environmental and Biological Engineering, Nanjing University of Science and Technology, Nanjing 210094, China; Corresponding author.
Xiaoyu Liu: College of Information Engineering, Jiangsu Vocational College of Agriculture and Forestry, Jurong, 212400, China
Yanfang Feng: Key Laboratory of Agro-Environment in Downstream of Yangtze Plain, National Agricultural Experiment Station for Agricultural Environment, Ministry of Agriculture and Rural Affairs, Institute of Agricultural Resources and Environment, Jiangsu Academy of Agricultural Sciences, Nanjing 210014, China

Journal volume & issue: Vol. 11
p. 100102

Abstract

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Microplastics (MPs) were considered as emerging pollutants in soil. Cadmium (Cd) is the typical heavy metal contaminant in paddy soil in China. It was not unraveled that the effects of the existence of MPs on soil properties and Cd adsorption after rice growth in paddy soil, one of the most important soil types in China. In this study, several typical MPs in dosage of 0.5% (w/w) with different particle sizes, including polyethylene (PE, 200μm), polyacrylonitrile (PAN, 200μm), and polyethylene terephthalate (PET, 200 and 10μm), were selected and aged for a rice season (∼6 months) in paddy soil by column experiments. Some essential physicochemical properties of paddy soil collected from different treatments and the adsorption performance of typical metal contaminants (cadmium, Cd) in paddy soil with MPs coexisting were compared. The results indicated that the 6-month existence of 200μmMPs increased water content (15.94% to 26.08-30.30%), pH value (7.05 to 7.16–7.33), organic matter (OM) content (15.1 gkg −1 to 18.2–22.9 gkg −1), the percentage of soil sand and Cd adsorption capacity of paddy soil, whereas decreased soil cation exchange capacity (CEC), the percentage of soil clay and silt. The adsorption experiments of Cd in soil showed that the adsorption behavior was consistent with the pseudo-second order and Langmuir isotherm model, and the addition of MPs would increase the adsorption capacity of Cd in soil. Besides, the particle size of MPs was found to be one of the dominant factors, in which MPs with smaller particle size (10μm) favored the increase of water content, pH, OM content, CEC, and adsorption performance with Cd. The results of this study could provide a supplemental understanding of the effect of MPs input on the paddy soil ecosystem, including the soil properties and the bioavailability and transport of metal in paddy soil.

Published in Resources, Environment and Sustainability

ISSN: 2666-9161 (Online)
Publisher: Elsevier
Country of publisher: Netherlands
LCC subjects: Geography. Anthropology. Recreation: Environmental sciences; Technology: Environmental technology. Sanitary engineering: Environmental effects of industries and plants
Website: https://www.journals.elsevier.com/resources-environment-and-sustainability/

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