Centro de Investigaciones en Física e Ingeniería del Centro de la Provincia de Buenos Aires (CIFICEN, CONICET-UNCPBA), Pinto 399, 7000, Tandil, Argentina.
Centro Marplatense de Investigaciones Matemáticas (CEMIM-UNMDP-CONICET), Diagonal J. B. Alberdi 2695, Mar del Plata, Argentina.
Environ Pollut. 2020 Nov;266(Pt 1):115229. doi: 10.1016/j.envpol.2020.115229. Epub 2020 Jul 21.
Particulate air pollution in cities comprises a variety of harmful compounds, including fine iron rich particles, which can persist in the air for long time, increasing the adverse exposure of humans and living things to them. We studied street tree (among other species, Cordyline australis, Fraxinus excelsior and F. pensylvanica) barks as biological collectors of these ubiquitous airborne particles in cities. Properties were determined by the environmental magnetism method, inductively coupled plasma optical emission spectrometry and scanning electron microscopy, and analyzed by geostatistical methods. Trapped particles are characterized as low-coercivity (mean ± s.d. value of remanent coercivity H = 37.0 ± 2.4 mT) magnetite-like minerals produced by a common pollution source identified as traffic derived emissions. Most of these Fe rich particles are inhalable (PM), as determined by the anhysteretic ratio χ/χ (0.1-1 μm) and scanning electron microscopy (<1 μm), and host a variety of potentially toxic elements (Cr, Mo, Ni, and V). Contents of magnetic particles vary in the study area as observed by magnetic proxies for pollution, such as mass specific magnetic susceptibility χ (18.4-218 × 10 m kg) and in situ magnetic susceptibility κ (0.2-20.2 × 10 SI). The last parameter allows us doing in situ magnetic biomonitoring, being convenient because of species preservation, measurement time, and fast data processing for producing prediction maps of magnetic particle pollution.
城市中的颗粒物空气污染包含多种有害化合物，包括富含铁的细颗粒，这些颗粒可以在空气中长时间存在，增加了人类和生物暴露于这些有害物质的不利程度。我们研究了街道树木（包括其他物种，如澳洲苏铁、欧洲白蜡和美国红枫）的树皮，作为城市中这些无处不在的空气传播颗粒的生物收集器。通过环境磁学方法、电感耦合等离子体光学发射光谱法和扫描电子显微镜法确定了其性质，并通过地质统计学方法进行了分析。捕获的颗粒的特征为低矫顽力（剩磁矫顽力 H 的均值 ± 标准差值 = 37.0 ± 2.4 mT）磁铁矿类似矿物，这些矿物由一个常见的污染源产生，该污染源被确定为交通衍生排放。这些富含铁的颗粒中的大部分是可吸入的（PM），这是通过无滞后比 χ/χ（0.1-1 μm）和扫描电子显微镜（<1 μm）来确定的，并且含有多种潜在的有毒元素（Cr、Mo、Ni 和 V）。在研究区域中，通过污染的磁性示踪剂（如质量磁化率 χ（18.4-218×10 -3 m 3 kg -1）和原位磁化率 κ（0.2-20.2×10 -3 SI））观察到磁性颗粒的含量有所不同。后一个参数允许我们进行原位磁性生物监测，因为它具有物种保存、测量时间和快速数据处理的优点，可用于生成磁性颗粒污染的预测图。
