Kaolinite reduced Cd accumulation in peanut and remediate soil contaminated with both microplastics and cadmium

Xin Song; Jianpeng Jin; Haiyun Li; Fangli Wang; Jun Liu; Xuexia Wang; Xiaoli Huang; Chao Chai; Ningning Song; Haiying Zong

Ecotoxicology and Environmental Safety (Nov 2023)

Kaolinite reduced Cd accumulation in peanut and remediate soil contaminated with both microplastics and cadmium

Xin Song,
Jianpeng Jin,
Haiyun Li,
Fangli Wang,
Jun Liu,
Xuexia Wang,
Xiaoli Huang,
Chao Chai,
Ningning Song,
Haiying Zong

Affiliations

Xin Song: Qingdao Engineering Research Center for Rural Environment/School of Resources and Environment, Qingdao Agricultural University, Qingdao 266109, PR China
Jianpeng Jin: Qingdao Engineering Research Center for Rural Environment/School of Resources and Environment, Qingdao Agricultural University, Qingdao 266109, PR China
Haiyun Li: Jingtanggang Branch of Technology Center of Shijiazhuang Customs District, Shijiazhuang 050011, PR China
Fangli Wang: Qingdao Engineering Research Center for Rural Environment/School of Resources and Environment, Qingdao Agricultural University, Qingdao 266109, PR China
Jun Liu: Qingdao Engineering Research Center for Rural Environment/School of Resources and Environment, Qingdao Agricultural University, Qingdao 266109, PR China
Xuexia Wang: Institute of plant nutrition and resources, Beijing Agricultural Forestry Academy Sciences, Beijing 100097, PR China
Xiaoli Huang: Central Laboratory, Qingdao Agricultural University, Qingdao 266109, PR China
Chao Chai: Qingdao Engineering Research Center for Rural Environment/School of Resources and Environment, Qingdao Agricultural University, Qingdao 266109, PR China
Ningning Song: Qingdao Engineering Research Center for Rural Environment/School of Resources and Environment, Qingdao Agricultural University, Qingdao 266109, PR China; Corresponding authors at: Qingdao Engineering Research Center for Rural Environment/School of Resources and Environment, Qingdao Agricultural University, Qingdao 266109, PR China
Haiying Zong: Qingdao Engineering Research Center for Rural Environment/School of Resources and Environment, Qingdao Agricultural University, Qingdao 266109, PR China; Corresponding authors at: Qingdao Engineering Research Center for Rural Environment/School of Resources and Environment, Qingdao Agricultural University, Qingdao 266109, PR China

Journal volume & issue: Vol. 266
p. 115580

Abstract

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Microplastics (MPs) increase the effective state of heavy metals (HMs) in soil and seriously threaten the yield and quality of peanuts (Arachis Hypogea L.). Kaolinite (KL) has the potential to ameliorate MP- and HM- contaminated soils, but the mechanism of action between them is not well understood. Therefore, 60-day experiments were conducted, where KL (1 %, 2 %) and MPs (0.1 %, 1 %) were individually or jointly mixed into soils with different cadmium (Cd) concentrations (0.5, 2.5, and 5.0 mg·kg−1) to cultivate peanuts in a greenhouse. Finally, soil-bioavailable Cd, peanut dry weight, peanut Cd concentrations, the pH, cation exchange capacity (CEC), dissolved organic carbon (DOC), microbial biomass carbon (MBC) and microbial biomass nitrogen (MBN) were determined. It was shown that MPs negatively affected the peanut dry weight and increased the content of soil-bioavailable Cd and Cd concentration in peanut. In the MP- and Cd-contaminated soils, KL mitigated the negative influence of MPs by increasing the dry weight of peanuts by 8.40 %−40.59 %, decreasing the soil-bioavailable Cd by 23.70–35.74 %, and significantly decreasing peanut Cd concentrations by 9.65–30.86 %. The presence of MPs decreased soil pH (7.69–7.87) and the CEC (20.96–23.95 cmol·L−1) and increased the soil DOC (1.84–2.26 mg·kg−1). KL significantly increased soil pH (7.79–8.03) and the CEC (24.96–28.28 cmol·L−1) and mitigated the adverse influence of MPs on the pH and CEC of Cd-contaminated soils. A regression path analysis (RPA) evidenced that KL decreased Cd accumulation in plants by changing the properties of soil contaminated with MPs and Cd. The research results revealed the mechanism of KL on peanut growth and Cd absorption in MP- and Cd-contaminated soil. The results of this study provide a foundation to improve the quality of MP- and HM-contaminated soils and realize safe peanut production.

Published in Ecotoxicology and Environmental Safety

ISSN: 0147-6513 (Print); 1090-2414 (Online)
Publisher: Elsevier
Country of publisher: United States
LCC subjects: Technology: Environmental technology. Sanitary engineering: Environmental pollution; Geography. Anthropology. Recreation: Environmental sciences
Website: https://www.journals.elsevier.com/ecotoxicology-and-environmental-safety

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