College of Food Science Technology and Chemical Engineering, Hubei University of Arts and Science, Xiangyang, Hubei, 441053, China.
Institute of Soil Chemistry & Environmental Science, AARI, Pakistan.
Chemosphere. 2022 Nov;307(Pt 2):135943. doi: 10.1016/j.chemosphere.2022.135943. Epub 2022 Aug 7.
Information on the distribution and interaction of microplastics (MPs) and humic acids (HAs) in river sediment has not been fully explored. This study assessed the distribution and interaction of MPs with HAs at different depths in river sediments. The results delineated that the average abundance of MPs in the 0-10 cm layer (190 ± 20 items/kg) was significantly lower than that in the 11-20 cm and 21-30 cm layers (211 ± 10 items/kg and 238 ± 18 items/kg, respectively). Likewise, the large MP particles mainly existed in the 0-10 cm layer (31.53%-37.87%), while small MP particles were found in the 21-30 cm layers (73.23%-100%). Moreover, HAs in MPs showed a transformation from low molecular weight to high molecular weight with an increase in depth from 0-10 cm to 21-30 cm, which may contribute to the distribution of MPs in the river sediments. These results provide new insight into the migration of MP pollution in river sediments, but further research needs to assess the interaction of MP with HA for mitigating MP pollution in river sediment.
有关微塑料（MPs）和腐殖酸（HAs）在河沉积物中分布和相互作用的信息尚未得到充分探索。本研究评估了 MPs 与 HAs 在河沉积物不同深度的分布和相互作用。结果表明，0-10cm 层中 MPs 的平均丰度（190±20 个/千克）明显低于 11-20cm 和 21-30cm 层（分别为 211±10 个/千克和 238±18 个/千克）。同样，大 MPs 颗粒主要存在于 0-10cm 层（31.53%-37.87%），而小 MPs 颗粒存在于 21-30cm 层（73.23%-100%）。此外，随着深度从 0-10cm 增加到 21-30cm，MPs 中的 HAs 表现出从低分子量到高分子量的转变，这可能有助于 MPs 在河沉积物中的分布。这些结果为 MPs 污染在河沉积物中的迁移提供了新的见解，但需要进一步研究来评估 MPs 与 HA 的相互作用，以减轻河沉积物中的 MP 污染。
