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首页> 外文期刊>Atmospheric Pollution Research >Magnetic mapping of air pollution in Tandil city (Argentina) using the lichen Parmotrema pilosum as biomonitor
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Magnetic mapping of air pollution in Tandil city (Argentina) using the lichen Parmotrema pilosum as biomonitor

机译：坦迪尔市（阿根廷）以地衣芽孢菌为生物监测器对空气污染的磁图

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The lichen Parmotrema pilosum is sensitive to pollution and it can live accumulating airborne pollutants for long time, such characteristic allows its use as biomonitor for environmental mapping in urban areas when this epiphytic specie is available. In this work, we investigated the use of such passive collector and magnetic techniques to monitor the air pollution in Tandil, a city located in Buenos Aires province with approximately 125,000 inhabitants, 60,000 vehicles and various metallurgical factories inside the urban area. The sampling strategy was carried out following a random stratified design and measuring magnetic susceptibility, magnetic hysteresis loops, anhysteretic and isothermal remanent magnetization and thermomagnetic studies to determine the magnetic properties of airborne particles accumulated on lichen samples. Scanning electron microscopy observations show particles with different morphologies (individual particles, spherules and aggregates) and composition (Fe, Al, Ni, Cr, Ti, Cu, K and Br) produced by metallurgical factories and by gaseous/solid vehicle emissions. The magnetic mineralogy shows the predominance of pseudo-single domain magnetite-like mineral and the magnetic grain size estimations indicate the presence of fine particles (0.1????m) in sites with low vehicular traffic or less polluted, while sites more affected by pollution (high vehicular traffic and metallurgical industries) are characterized by coarser magnetic grain size particles, between 0.1 and 5????m. Mass-specific magnetic susceptibility was represented in a 2-D contour map to observe in detail the distribution of magnetic particles in this urban area, giving high values (up to 1161.2??????10a??8??m3??kga??1) that are indicative of areas with high pollution loading.
机译：地衣毛细孔菌对污染敏感，并且可以长时间累积空气中的污染物，这种特征使其可以在有附生物种的情况下用作城市环境地图的生物监测器。在这项工作中，我们调查了使用这种无源收集器和磁技术来监测坦迪尔（Tandil）的空气污染的情况。坦迪尔是位于布宜诺斯艾利斯省的一个城市，该城市约有125,000名居民，60,000辆汽车以及市区内的各种冶金工厂。抽样策略是按照随机分层设计进行的，并测量磁化率，磁滞回线，磁滞和等温剩余磁化强度以及热磁研究，以确定积聚在地衣样品上的气载颗粒的磁性能。扫描电子显微镜观察显示，冶金工厂和气态/固态车辆产生的颗粒具有不同形态（单个颗粒，球状和聚集体）和组成（Fe，Al，Ni，Cr，Ti，Cu，K和Br）。磁性矿物学表明，假单畴磁铁矿样矿物占主导地位，磁性粒度估计表明，在交通流量较低或污染较少的地点存在细小颗粒（<0.1≤？m），而受影响较大的地点污染（高车辆通行和冶金工业）的特征是具有较大的磁性颗粒尺寸，在0.1至5？m之间。在二维等值线图中表示特定于质量的磁化率，以详细观察该市区中磁性颗粒的分布，并给出较高的值（最高为1161.2 ??? 10a ?? 8 ?? m3？3）。 kga ?? 1）表示高污染负荷区域。

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