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Microplastic pollution and the related ecological risks of organic composts from different raw materials

文献类型： 外文期刊

作者： Zhang, Jiajia 1 ; Guo, Ning 2 ; Ding, Wencheng 3 ; Han, Bao 4 ; Zhao, Meng 1 ; Wang, Xuexia 1 ; Wang, Jiachen 1 ; Cao, Bing 1 ; Zou, Guoyuan 1 ; Chen, Yanhua 1 ;

作者机构： 1.Beijing Acad Agr & Forestry Sci, Inst Plant Nutr Resources & Environm, Beijing 100097, Peoples R China

2.Beijing Cultivated Land Construct & Protect Ctr, Beijing 100029, Peoples R China

3.Chinese Acad Agr Sci, Minist Agr & Rural Affairs, Inst Agr Resources & Reg Planning, Key Lab Plant Nutr & Fertilizer, Beijing 100081, Peoples R China

4.Fangshan Planting Technol Promot Stn Beijing, Beijing 102412, Peoples R China

关键词： Organic compost; Occurrence characteristic; Weathering morphology; Microplastics input; Pollution risk level

期刊名称：JOURNAL OF HAZARDOUS MATERIALS （ 影响因子：13.6； 五年影响因子：12.7 ）

ISSN： 0304-3894

年卷期： 2023 年 458 卷

页码：

收录情况： SCI

摘要： Organic composts are considered emerging contributors to microplastics (MPs) accumulation in agricultural soils. However, MPs pollution in organic compost from different raw materials is unknown. This study investigated MPs occurrence and characteristics in 124 organic compost samples, including single feedstock (livestock manure, poultry manure, crop straw, and solid waste) and compound organic composts, and quantitatively assessed related ecological risks of MPs pollution. The highest and lowest MPs abundances were observed in solid waste (6615 items kg � 1) and crop straw (1500 items kg � 1) composts, respectively. Compost MPs were mainly 0.5-1 mm (39.5%), colorful polypropylene and polyethylene fragments and films, and polyethylene terephthalate fibers, and the input to farmland soils was 6.96 x 107 to 1.88 x 108 items ha-1 yr  1. Regardless of feedstock, compost-based MPs of different shapes exhibited complicated weathering morphologies and adhered to some mineral colloids. The highest and lowest MPs-induced risk indices in solid waste (H = 134.3) and crop straw (H = 8.9) composts yielded hazard levels IV (high risk) and II (low risk), respectively, due to the different abundance of polymers with diverse hazard scores. These findings provide insights into MPs pollution in organic composts and a theoretical basis for the safe production and application of compost.

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