Queensland Alliance for Environmental Health Sciences, The University of Queensland, 20 Cornwall Street, Woolloongabba, Queensland 4102, Australia.
Queensland Alliance for Environmental Health Sciences, The University of Queensland, 20 Cornwall Street, Woolloongabba, Queensland 4102, Australia.
J Hazard Mater. 2021 Aug 15;416:125811. doi: 10.1016/j.jhazmat.2021.125811. Epub 2021 Apr 8.
Microplastics (1 - 5000 µm) are pervasive in every compartment of our environment. However, little is understood regarding the concentration and size distribution of microplastics in road dust, and how they change in relation to human activity. Within road dust, microplastics move through the environment via atmospheric transportation and stormwater run-off into waterways. Human exposure pathways to road dust include dermal contact, inhalation and ingestion. In this study, road dust along an urban to rural transect within South-East Queensland, Australia was analysed using Accelerated Solvent Extraction followed by pyrolysis Gas Chromatography-Mass Spectrometry (Pyr-GC/MS). Polypropylene, polystyrene, polyethylene terephthalate, polyvinyl chloride, poly (methyl methacrylate) and polyethylene were quantified. Microplastic concentrations ranged from ~0.5 mg/g (rural site) to 6 mg/g (Brisbane city), consisting primarily of polyvinyl chloride (29%) and polyethylene terephthalate (29%). Size fractionation (< 250 µm, 250-500 µm, 500-1000 µm, 1000-2000 µm and 2000-5000 µm) established that the < 250 µm size fraction contained the majority of microplastics by mass (mg/g). Microplastic concentrations in road dust demonstrated a significant relationship with the volume of vehicles (r = 0.63), suggesting traffic, as a proxy for human movement, is associated with increased microplastic concentrations in the built environment.
微塑料（1-5000μm）广泛存在于我们环境的各个部分。然而，对于道路灰尘中微塑料的浓度和粒径分布，以及它们如何与人的活动相关变化，人们知之甚少。在道路灰尘中，微塑料通过大气传输和雨水冲刷进入水道，在环境中移动。人类接触道路灰尘的途径包括皮肤接触、吸入和摄入。在这项研究中，使用加速溶剂萃取法（ASE） followed by 热裂解气相色谱-质谱联用（Pyr-GC/MS）对澳大利亚东南部昆士兰州一条从城市到农村的横断线上的道路灰尘进行了分析。定量分析了聚丙烯、聚苯乙烯、聚对苯二甲酸乙二醇酯、聚氯乙烯、聚甲基丙烯酸甲酯和聚乙烯。微塑料浓度范围为~0.5mg/g（农村地区）至 6mg/g（布里斯班市），主要由聚氯乙烯（29%）和聚对苯二甲酸乙二醇酯（29%）组成。粒径分级（<250μm、250-500μm、500-1000μm、1000-2000μm 和 2000-5000μm）表明，<250μm 粒径级分的微塑料质量（mg/g）占大多数。道路灰尘中的微塑料浓度与车辆数量呈显著正相关（r=0.63），这表明交通（作为人类活动的代表）与建筑环境中微塑料浓度的增加有关。
