全球车辆车队的不断扩大,通过重金属污染对环境质量构成了越来越大的威胁。在这种情况下,监测以保障城市地区的公共卫生是必要的。我们的研究涉及从巴西大都市(累西腓)的道路上收集36个街道灰尘和29个苔藓样本,其交通强度如下:自然保护区(每天0辆车),低(每天<15,000辆),中型(每天15,000-30,000辆),和高(每天>30,000辆)。进行ICP-AES分析以确定9种潜在有毒金属的浓度(Ba,Cd,Cr,Cu,Mn,Ni,Pb,V,和锌)来评估车流量对城市污染的影响。在街道灰尘样本中,平均金属浓度(mgkg-1)表现出以下顺序:Ba(503.7)>Mn(303.0)>Zn(144.4)>Cu(95.3)>Cr(56.1)>Pb(34.2)>V(28.7)>Ni(11.3)>Cd(1.5)。相反,在苔藓样本中,金属浓度顺序如下(mgkg-1):Mn(63.8)>Zn(62.5)>Ba(61.0)>Cu(17.7)>Cr(8.0)>V(7.3)>Pb(7.0)>Ni(2.9)>Cd(0.3)。交通量较高的道路在所有金属的苔藓样品和Cd的灰尘样品中表现出最高的金属富集,Cr,Mn,Ni,V.然而,来自低流量道路的灰尘对Ba有更高的富集,Cu,Zn,说明了其他交通相关因素在金属沉积中的影响作用。我们的发现强调交通流量是城市中心的主要污染源,街道灰尘和苔藓都是车辆交通造成的金属输入的敏感指标。这些指标为城市质量监测和污染控制工作提供了宝贵的见解。
The continuous expansion of the global vehicle fleet poses a growing threat to environmental quality through heavy metal contamination. In this scenario, monitoring to safeguard public health in urban areas is necessary. Our study involved the collection of 36 street dust and 29
moss samples from roads of a Brazilian metropolis (Recife) with varying traffic intensities as follows: natural reserve (0 vehicles per day), low (< 15,000 vehicles per day), medium (15,000-30,000 vehicles per day), and high (> 30,000 vehicles per day). ICP-AES analysis was performed to determine the concentrations of nine potentially toxic metals (Ba, Cd, Cr, Cu, Mn, Ni, Pb, V, and Zn) to assess the influence of vehicular flow on urban contamination. In the street dust samples, the mean metal concentrations (mg kg-1) exhibited the following order: Ba (503.7) > Mn (303.0) > Zn (144.4) > Cu (95.3) > Cr (56.1) > Pb (34.2) > V (28.7) > Ni (11.3) > Cd (1.5). Conversely, in the
moss samples, the metal concentration order was as follows (mg kg-1): Mn (63.8) > Zn (62.5) > Ba (61.0) > Cu (17.7) > Cr (8.0) > V (7.3) > Pb (7.0) > Ni (2.9) > Cd (0.3). Roads with higher traffic volumes exhibited the highest metal enrichments in
moss samples for all metals and in dust samples for Cd, Cr, Mn, Ni, and V. However, dust from low-flow roads had higher enrichments for Ba, Cu, and Zn, indicating the influential role of other traffic-related factors in metal deposition. Our findings highlight traffic flow as the predominant source of pollution in urban centers, with both street dust and
moss serving as sensitive indicators of metal input attributable to vehicular traffic. These indicators offer valuable insights for urban quality monitoring and pollution control efforts.