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| Abundance of microplastics in farmland soil and its distribution in soil aggregate fractions in the Liaoning area |
| Received:June 11, 2023 |
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| KeyWord:microplastic;soil aggregate;farmland soil;Liaoning area |
| Author Name | Affiliation | E-mail | | WANG Zhan | Shenyang Agricultural University, College of Land and Environment, Shenyang 110866, China | | | CHEN Chunyu | Shenyang Agricultural University, College of Land and Environment, Shenyang 110866, China | | | SU Peiyao | Shenyang Agricultural University, College of Land and Environment, Shenyang 110866, China | | | XING Yunfei | Shenyang Agricultural University, College of Land and Environment, Shenyang 110866, China | | | ZOU Hongtao | Shenyang Agricultural University, College of Land and Environment, Shenyang 110866, China | zht@syau.edu.cn | | ZHANG Yulong | Shenyang Agricultural University, College of Land and Environment, Shenyang 110866, China | |
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| Abstract: |
| To clarify microplastic pollution in farmland soil in the Liaoning area, the abundance and distribution of microplastics in the soil and aggregate fractions were determined using density separation, and oxidative decomposition combined with a microscope and Fourier infrared spectrometer. The farmland soils from 14 regions in Liaoning were collected as tested samples. The results showed that the abundance of microplastics in the farmland soil of the Liaoning area was 3 605 items·kg-1. There were four main shapes of microplastics in the soil, including fibers, granules, flakes, and films. Of the microplastics analyzed, fibers were found to be the most prevalent in the soil, with a ratio of 42.11%, followed by granules and flakes, with a ratio of 29.10% and 22.32%, respectively, while films accounted for the smallest ratio of 6.47%. The main component of fibers was nylon, the main component of granules was polyethylene terephthalate, and the main component of flakes and films was polyethylene. The abundance and shape composition of the microplastics in the farmland soil of the 14 regions of Liaoning were various. The abundance of microplastics in the soil of Liaoyang, Chaoyang, Benxi, and Yingkou was significantly higher than that of other regions. Additionally, 69.14% of the microplastics in the soil were associated with soil aggregates, especially micro-aggregates, and 30.86% of the microplastics were dispersed. The distribution of various shapes of microplastics in the aggregate fractions was also different. The fibers and granules were mainly in micro-aggregates, and the films were mainly in macroaggregates; there were no obvious differences in the distribution of flakes in the various aggregate fractions. In conclusion, microplastics were widely present in the farmland soils of the Liaoning area, but their spatial distribution was uneven in the different areas. The microplastics in the soil were mainly fibers, which were composed of nylon. Most of the microplastics were associated with aggregates, but some were dispersed, exhibiting a potential risk of leaching into deeper soil and groundwater under irrigation or rainfall conditions. |
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