交通干道生物滞留带中轮胎磨损颗粒的空间分布特征研究

Spatial distribution characteristics of tire wear particles in bioretention zone from main traffic road

近年来,轮胎磨损颗粒(Tire wear particles,TWP)作为最常见的微塑料污染源受到广泛关注.为了解某一特定环境中TWP的分布特征,本研究以重庆市渝北区悦来生态城为例,分析了该区域交通干道旁生物滞留带中TWP的空间分布特征,实验采用密度分离方法提取TWP,并对TWP进行定性定量测定.结果表明,1#、2#和3#生物滞留带中均存在TWP迁移现象,且随着地势高低和深度而变化.1#、2#和3#生物滞留带的TWP水平含量最高分别为0.032、0.054和0.016 mg·g^(-1),最低分别为0.011、0.011和0.014 mg·g^(-1),TWP含量表现为随着高程增加而降低.1#和3#生物滞留带的TWP垂向含量最高分别为0.063和0.029 mg·g^(-1),其次分别为0.015和0.024 mg·g^(-1),TWP含量表现为表层>底层>中层,2#生物滞留带整体分布相对均匀.根据TWP在生物滞留带的分布特征可知,植被对TWP空间分布的影响集中在表层,径流和粒径因素影响着TWP的迁移过程.

Recently,tire wear particles(TWP)are one of the most common microplastic pollution sources that have garnered significant attention.In this study,the spatial distribution characteristics of TWP were examined in the biological retention zones adjacent to main roads in the Yuelai Eco-city of Yubei District,Chongqing.TWP was extracted by using the density separation method and analyzed qualitatively and quantitatively to understand its distribution in this specific environment.The results showed that TWP migration occurred in the biological retention zones 1#,2#,and 3#and varied based on the terrain's height and depth.The highest TWP horizontal concentrations were recorded in 1#(0.032 mg·g^(-1)),2#(0.054 mg·g^(-1))and 3#(0.016 mg·g^(-1)),while the lowest TWP horizontal concentrations were 0.011 mg·g^(-1),0.011 mg·g^(-1),and 0.014 mg·g^(-1),respectively.The highest TWP vertical concentrations were observed in 1#and 3#,with 0.063 mg·g^(-1) and 0.029 mg·g^(-1),respectively,while the lowest TWP vertical concentrations were 0.015 mg·g^(-1) and 0.024 mg·g^(-1).TWP concentrations were the highest at the surface layer,followed by the middle and bottom layers,and showed a relatively uniform distribution for 2#.The study concluded that vegetation influenced the spatial distribution of TWP primarily in the surface layer while other factors such as runoff and particle size affected their migration process.