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Distribution characteristics and integrated ecological risks evaluation modelling of microplastics and heavy metals in geological high background soil

The Science of The Total Environment 2024 14 citations ? Citation count from OpenAlex, updated daily. May differ slightly from the publisher's own count. Score: 50 ? 0–100 AI score estimating relevance to the microplastics field. Papers below 30 are filtered from public browse.

Zhenming Zhang, Xiuyuan Yang, Yongcheng Jiang, Fupeng Li, Xiuyuan Yang, Zhenming Zhang, Zhenming Zhang, Zhenming Zhang, Fupeng Li, Xiuyuan Yang, Zhenming Zhang, Xiuyuan Yang, Zhenming Zhang, Zhenming Zhang, Xiuyuan Yang, Xiuyuan Yang, Yufeng Gong Zhenming Zhang, Zhenming Zhang, Zhenming Zhang, Zhenming Zhang, Zhenming Zhang, Xiuyuan Yang, Zhenming Zhang, Zhenming Zhang, Zhenming Zhang, Xiuyuan Yang, Xiuyuan Yang, Zhenming Zhang, Zhenming Zhang, Xiuyuan Yang, Zhenming Zhang, Zhenming Zhang, Zhenming Zhang, Zhenming Zhang, Zhenming Zhang, Zhenming Zhang, Zhenming Zhang, Zhenming Zhang, Zhenming Zhang, Zhenming Zhang, Fupeng Li, Yongcheng Jiang, Yunlei Cen, Yufeng Gong Fupeng Li, Yunlei Cen, Xiuyuan Yang, Zhenming Zhang, Fupeng Li, Fupeng Li, Fupeng Li, Zhenming Zhang, Zhenming Zhang, Xiuyuan Yang, Zhenming Zhang, Fupeng Li, Zhenming Zhang, Yufeng Gong

Summary

Researchers investigated the co-occurrence of microplastics and heavy metals in high geological background soil in Qianxi, China, and developed a new model for evaluating their combined ecological risk. They found elevated cadmium levels alongside significant microplastic contamination, with different crop rotation patterns influencing pollution distribution. The study proposes a two-dimensional index for assessing the joint environmental risks of microplastics and heavy metals in agricultural soils.

Polymers

The microplastics (MPs), a novel pollutant, and heavy metals (HMs) significantly affect soil ecology. The study investigated HMs and MPs in Qianxi's high geological background soil, established a model for risk evaluation with MPs types and shapes, and proposed a two-dimensional comprehensive index model for MPs-HMs combined pollution and risk evaluation criterion. The results revealed a high soil Cd concentration, with a mean value of 0.38 mg·kg. Additionally, soils from soybean-wheat intercropping-potato-corn rotation (SWI-PCR) exhibited significantly higher concentrations of Hg, As, and Pb compared with those from soybean-wheat intercropping-corn rotation (SWI-CR). Moreover, the soil exhibited a high abundance of MPs (8667.66 ± 3864.26 items·kg), mainly characterized by PS and fiber. The mean of adjusted ecological risk index (ARI) for MPs in soil was 525.27, indicating a grade 3 risk. The two-dimensional combined index (TPI) was used to assess the ecological risk of MPs-HMs combined pollution, exhibiting an exceedance rate of 56 % with a mean of 445.07. The risk level of the combined pollution was graded as 6, indicating high risk. The microplastic risk evaluation model and the comprehensive evaluation method of combined pollution established in this study provide a reference for the future risk evaluation of multi-pollutant combined pollution.

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