State Key Laboratory of Pollution Control and Resource Reuse, School of the Environment, Nanjing University, Nanjing 210023, China.
State Key Laboratory of Pollution Control and Resource Reuse, School of the Environment, Nanjing University, Nanjing 210023, China.
Sci Total Environ. 2024 Nov 15;951:175751. doi: 10.1016/j.scitotenv.2024.175751. Epub 2024 Aug 26.
Tire wear particles (TWP), as an emerging type of microplastics, are a significant source of contaminants in roadside soils due to their high concentration of pollutants, including polycyclic aromatic hydrocarbons (PAHs). This study explored the impact of ultraviolet (UV) exposure and natural aging on the in vitro bioaccessibility of PAHs associated with TWP in soil on a China-wide scale. Our findings suggested that UV exposure amplified the negative charge of TWP by 75 % and increased the hydrophobic groups on the particle surface. The bioaccessibility of 3- and 4-ring PAHs in TWP was significantly (p < 0.05) heightened by UV exposure. After 20 types of soils containing 2 % UV-exposed TWP underwent natural aging, the bioaccessibility of PAHs saw a significant decrease (p < 0.05) to 16-48 %, compared to 28-96 % in the unaged group. Soil pH and electrical conductivity (EC) were the two primary soil properties positively influencing the reduction of in vitro PAHs concentration and PAHs bioaccessibility. According to the prediction results, soils in southern China presented the highest potential region for the release of bioaccessible PAHs from TWP, highlighting the regional specificity of environmental impact. Our study provides valuable insights into the biological impact of PAHs associated with TWP on a regional scale, and offers scientific evidence for targeted soil risk management strategies.
轮胎磨损颗粒（TWP）作为一种新兴的微塑料类型，由于其污染物浓度高，包括多环芳烃（PAHs），是路边土壤中污染物的重要来源。本研究在中国范围内探讨了紫外线（UV）暴露和自然老化对 TWP 相关土壤中 PAHs 体外生物可及性的影响。我们的研究结果表明，UV 暴露将 TWP 的负电荷增加了 75%，并增加了颗粒表面的疏水性基团。UV 暴露显著提高了 TWP 中 3-和 4-环 PAHs 的生物可及性（p<0.05）。在 20 种含有 2%UV 暴露 TWP 的土壤经历自然老化后，与未老化组的 28-96%相比，PAHs 的生物可及性显著降低（p<0.05）至 16-48%。土壤 pH 值和电导率（EC）是两个主要的土壤性质，它们正向影响体外 PAHs 浓度和 PAHs 生物可及性的降低。根据预测结果，中国南方的土壤具有从 TWP 中释放生物可及 PAHs 的最高潜力区域，突出了环境影响的区域特异性。本研究提供了有关 TWP 相关 PAHs 对区域尺度的生物影响的有价值的见解，并为有针对性的土壤风险管理策略提供了科学证据。
