Universidade da Coruña, Grupo Química Analítica Aplicada (QANAP), Instituto Universitario de Medio Ambiente (IUMA), 15008 A Coruña, Spain.
Universidade da Coruña, Grupo Química Analítica Aplicada (QANAP), Instituto Universitario de Medio Ambiente (IUMA), 15008 A Coruña, Spain.
Sci Total Environ. 2022 Nov 20;848:157703. doi: 10.1016/j.scitotenv.2022.157703. Epub 2022 Jul 29.
The hydrophobicity of persistent organic pollutants (POPs) makes them adsorb on microplastics in the marine environment, affecting their distribution, persistence, or their transfer to the trophic chain. Fragrances and non-polar pesticides can be adsorbed by microplastics in the marine environment because of their physico-chemical characteristics. In this work, the adsorption of two pesticides (α-endosulfan and chlorpyrifos) and 6 musk fragrances (musk xylene, musk ketone, musk moskene, galaxolide, tonalide, and celestolide) on polyamide (PA6) (a petroleum based polymer) and on polyhydroxybutyrate (PHB) (biopolymer) in seawater was studied, considering also the effect of water temperature and plastic weathering. Results show higher adsorption of the selected pollutants for PHB than PA, being PA more affected by the water temperature and the plastic weathering. The highest percentage of adsorption was achieved in most cases at 24 h. In addition, this process was irreversible, as it showed the leaching assays. Besides, this work revealed that plastics mitigate the degradation of α-endosulfan in aquatic media (hydrolysis), showing that plastics can act as inhibitors of degradation of POPs, increasing its persistence in the environment.
持久性有机污染物 (POPs) 的疏水性使其在海洋环境中吸附在微塑料上，影响其分布、持久性或向食物链的转移。由于具有物理化学特性，香料和非极性农药可以被海洋环境中的微塑料吸附。在这项工作中，研究了两种农药（α-硫丹和毒死蜱）和 6 种麝香香料（二甲苯麝香、酮麝香、麝香莫斯卡林、佳乐麝香、 tonalide 和 celestolide）在海水中对聚酰胺 (PA6)（石油基聚合物）和聚羟基丁酸酯 (PHB)（生物聚合物）的吸附作用，同时考虑了水温和塑料风化的影响。结果表明，与 PA 相比，所选污染物对 PHB 的吸附率更高，而 PA 受水温和塑料风化的影响更大。在大多数情况下，24 小时内达到了最高的吸附百分比。此外，该过程是不可逆的，因为它显示了浸出试验。此外，这项工作表明，塑料可以减轻 α-硫丹在水生介质中的降解（水解），这表明塑料可以作为 POPs 降解的抑制剂，增加其在环境中的持久性。
