由于膨体灌溉的来源相似,有机肥,和污泥应用,微塑料(MPs)和抗生素在农业土壤中不可避免地共存。然而,不同聚合物类型和老化状态的MPs对土壤中共存抗生素的生物可及性的影响尚不清楚。因此,我们使用有机化合物器件(o-DGT)的扩散梯度膜来评估磺胺嘧啶(SDZ)在水稻土和用0.5%(w/w)MPs改良的盐渍土中的分布。四种聚合物类型(聚乙烯:PE,聚丙烯:PP,聚酰胺:PA,和聚对苯二甲酸乙二醇酯:PET)和MPs的两种老化状态(老化的PE和老化的PP)用于本研究。结果表明,土壤性质显著影响SDZ在土壤和土壤溶液中的分配,在盐渍土壤中,SDZ的降解速率较低,但迁移率较高。MPs对SDZ在水稻土和盐渍土之间的分配具有不同的影响。值得注意的是,PP将水稻土中不稳定的固相溶相分配系数(Kdl)降低了17.7%,而PE,PP,在盐渍土壤中,aPE使Kdl值分别增加了2.00、1.62和2.81倍。此外,在盐渍土壤中,所有的MP都降低了土壤溶液中的SDZ浓度,而在o-DGT阶段SDZ显著增加。相反,MPs不影响水稻土中SDZ的o-DGT浓度。此外,MPs增加了两种土壤中SDZ的R值,特别是在盐渍土壤中。这表明国会议员可能会增加SDZ从土壤到植物的再供应,特别是在盐水条件下。此外,与盐渍土壤中的原始MPs相比,老年MPs对这些指标的影响更为明显。因此,土壤中的国会议员对生物群吸收SDZ构成潜在风险,特别是在脆弱的环境中。此外,老年议员的风险加剧。
Due to the similar sources of swage irrigation, organic fertilizer, and sludge application, microplastics (MPs) and antibiotics coexist inevitably in the agriculture soils. However, the impacts of MPs with different polymer types and aging status on the bio-accessibility of co-existing antibiotics in soils remained unclear. Therefore, we using the diffusive gradients films for organic compounds devices (o-DGT) to evaluated the distribution of sulfadiazine (SDZ) in both paddy soil and saline soil amended with 0.5 % (w/w) MPs. Four polymer types (polyethylene: PE, polypropylene: PP, polyamide: PA, and polyethylene terephthalate: PET) and two aging statuses (aged PE and aged PP) of MPs were used in this study. Results showed that soil properties significantly influence the partition of SDZ in soil and soil solution, and SDZ gained a lower degradation rate but higher mobility in saline soil. MPs pose different impacts on partition of SDZ between paddy soil and saline soil. Notably, PP reduced the labile solid phase-solution phase partition coefficient (Kdl) by 17.7 % in paddy soil, while PE, PP, and aPE increased the Kdl value by 2.00, 1.62, and 2.81 times in saline soil. Besides, in saline soil, all the MPs reduced the SDZ concentration in the soil solution, while significantly increased the SDZ in o-DGT phase. Conversely, MPs did not impact the SDZ\'s o-DGT concentration in paddy soil. Additionally, MPs increased the R value of SDZ in two soils, especially in saline soil. It suggested that MPs could potentially enhance the resupply of SDZ from soil to plants, particularly under saline conditions. Furthermore, aged MPs had a more pronounced effect on these indicators compared to virgin MPs in saline soil. Therefore, MPs in soil poses a potential risk for biota\'s uptake of SDZ, particularly in fragile environment. Moreover, the risk intensifies with aged MPs.