School of Environment, Guangdong Key Laboratory of Environmental Pollution and Health, Jinan University, Guangzhou 510632, China.
School of Environment, Guangdong Key Laboratory of Environmental Pollution and Health, Jinan University, Guangzhou 510632, China.
Sci Total Environ. 2022 Oct 20;844:157144. doi: 10.1016/j.scitotenv.2022.157144. Epub 2022 Jul 5.
In recent years, concerns have arisen from the chemicals incorporated into tire material which are of potential to leach with the tire and road wear particles (TRWP) into the environment. In this study, the distributions of substituted benzothiazoles (BTHs) and p-phenylenediamines (PPDs), two groups of representative TRWP-related chemicals, were investigated in various size fractions (<20, 20-53, 53-125, 125-250, 250-500, 500-1000 μm) of dust samples from open roads and indoor parking lots in the urban region of Guangzhou (Guangdong, China). Mass weight distribution of the dust samples showed that fractions of <250 μm accounted for >72% of the total dust in both microenvironments. Widespread occurrence was observed with >80% detection frequency for almost all target compounds in all the particle fractions. Concentrations of BTHs and PPDs were similar between the two dust matrices. In addition, the newly defined transformation product of 6PPD, 6PPD-Q was at the median concentration of 122 ng/g in road dust and 154 ng/g in indoor parking lot dust. Overall, concentrations of the target BTHs and PPDs varied in different size fractions, which were mostly dominated in fine particle sizes (<53 μm). Specially, >70% of the target compounds were in the size fractions of <250 μm, suggesting the necessity of using <250 μm fractions of particles for monitoring and evaluating contamination levels and exposure risks of BTHs and PPDs from dust in future studies.
近年来，人们对轮胎材料中所含的化学物质表示担忧，这些化学物质有可能随着轮胎和道路磨损颗粒（TRWP）渗透到环境中。在这项研究中，对不同粒径（<20、20-53、53-125、125-250、250-500、500-1000μm）的道路灰尘和室内停车场灰尘样品中的两种代表性 TRWP 相关化学物质：取代苯并噻唑（BTHs）和对苯二胺（PPDs）进行了分布研究。灰尘样品的质量重量分布表明，<250μm 的颗粒分数占两个微环境中总灰尘的>72%。几乎所有目标化合物在所有颗粒分数中都以超过 80%的检测频率广泛存在。两种灰尘基质中的 BTHs 和 PPDs 浓度相似。此外，在道路灰尘和室内停车场灰尘中，6PPD 的新定义转化产物 6PPD-Q 的浓度分别为 122ng/g 和 154ng/g。总体而言，目标 BTHs 和 PPDs 的浓度在不同粒径范围内有所不同，主要集中在细颗粒粒径（<53μm）范围内。特别是，>70%的目标化合物存在于<250μm 的粒径范围内，这表明未来的研究有必要使用<250μm 粒径的颗粒来监测和评估灰尘中 BTHs 和 PPDs 的污染水平和暴露风险。
