摘要

塑料现在可以在所有自然环境中找到，包括土壤。然而，微塑料在陆地系统中的影响仍然很大程度上未被探索。聚乙烯是在陆地环境中发现的大规模生产的聚合物之一。它用于许多不同的领域，例如农业覆盖物，复合材料和包装。土壤中微塑料（包括聚乙烯）的存在会影响疏水性有机污染物（包括农药）的运输。本研究的目的是研究聚乙烯微塑料（<250μm）对不同水溶液条件下土壤中两种有机植物保护剂（莠去津和4-（2,4-二氯苯氧基）丁酸）的转运的影响。 ，使用反相液相色谱法。发现吸附到纯聚乙烯微塑料上的山梨酸盐的分配系数显着小于吸附到纯土壤上的吸附物的分布系数。因此，向土壤中添加10％（w / w）聚乙烯导致吸附总体减少，但是由于pH和离子强度的变化引起的吸附趋势不受影响。结果表明，聚乙烯微塑料在土壤中的存在可能因此降低天然土壤的吸附能力而增加有机污染物的流动性，这必须通过进一步的研究来验证。

Plastics are now found in all natural environments including soil. The effects of microplastics in terrestrial systems, however, remain largely unexplored. Polyethylene is one of the mass-manufactured polymers found in terrestrial environments. It is used in many different sectors, for example in agricultural mulches, composite materials, and packaging. The presence of microplastics in soil, including polyethylene, can affect the transport of hydrophobic organic pollutants including pesticides. The objective of this study was to investigate the influence of polyethylene microplastics (<250 μm) on the transport of two selected organic plant-protection agents (atrazine and 4-(2,4-dichlorophenoxy) butyric acid) in soil under different aqueous conditions, using inverse liquid chromatography. The distribution coefficients for the sorbates that were sorbed to pure polyethylene microplastic were found to be significantly smaller than those for the sorbates sorbed to pure soil. The addition of 10% (w/w) polyethylene to the soil therefore led to an overall reduction in sorption, but the sorption trends due to variations in pH and ionic strength were not affected. The results imply that the presence of polyethylene microplastics in soil may therefore increase the mobility of organic contaminants by reducing the sorption capacity of natural soils, which must be validated by further research.

https://www.ncbi.nlm.nih.gov/pubmed/30543972