Abundance and morphology of microplastics in an agricultural soil following long-term repeated application of pig manure

被引：137

作者：

Yang, Jie ^{[1
,3
]}

Li, Ruijie ^{[2
,3
]}

Zhou, Qian ^{[2
,3
]}

Li, Lianzhen ^{[2
]}

Li, Yuan ^{[2
]}

Tu, Chen ^{[2
]}

Zhao, Xinyue ^{[2
]}

Xiong, Kuanxu ^{[2
]}

Christie, Peter ^{[1
]}

Luo, Yongming ^{[1
,2
]}

机构：

[1] Chinese Acad Sci, Inst Soil Sci, CAS Key Lab Soil Environm & Pollut Remediat, Nanjing 210008, Peoples R China

[2] Chinese Acad Sci, Yantai Inst Coastal Zone Res, CAS Key Lab Coastal Zone Environm Proc & Ecol Rem, Yantai 264003, Peoples R China

[3] Univ Chinese Acad Sci, Beijing 100049, Peoples R China

来源：

ENVIRONMENTAL POLLUTION | 2021年 / 272卷

基金：

中国国家自然科学基金;

关键词：

Accumulation; Farmland soil; Long-term fertilization; Microplastics; Morphology; Pig manure;

D O I：

10.1016/j.envpol.2020.116028

中图分类号：

X [环境科学、安全科学];

学科分类号：

08 ; 0830 ;

摘要：

Microplastics occur widely in the terrestrial environment and they currently occur in organic fertilizers applied to agricultural land. However, there is little information available on the accumulation of microplastics in soils fertilized over the long term. Here, we investigate the characteristics of microplastics in both pig manure and soil following long-term manure application in an attempt to assess their accumulation and the potential risk to agricultural soils of repeated application of pig manure. Microplastics were separated from soil and pig manure samples using a sequential flow separation and flotation method. The abundances of microplastics were 16.4 +/- 2.7 and 43.8 +/- 16.2 particles kg(-1) in control plots (CK, no manure applied) and plots amended annually with pig manure for 22 years (PM), respectively. The microplastics (especially fragments) were significantly enriched in PM-amended soil compared with the control plots. The average annual abundance of microplastics was 1250 +/- 640 particles kg(-1) in manure. Interestingly, the type and polymer composition of microplastics were very similar in the soil and manure. Differences in color and particle size indicate that microplastics sourced from pig manure may be gradually weathered and degraded after incorporation into the soil. The average accumulation rate of microplastics in the agricultural soil with long-term application of pig manure was estimated to be 3.50 +/- 1.71 million particles ha(-1) a(-1). The microplastics in the manured soil displayed complicated weathered surfaces. The presence of carbonyl groups suggests that the weathered microplastics in soil may have the potential to adsorb contaminants. (C) 2020 Elsevier Ltd. All rights reserved.

引用

页数：7