Centro de Investigaciones en Física e Ingeniería del Centro de la Provincia de Buenos Aires (CIFICEN), UNCPBA-CICPBA-CONICET, Pinto 399, 7000 Tandil, Argentina; Universidad Nacional del Centro de la Provincia de Buenos Aires (UNCPBA), Facultad de Ciencias Exactas, IFAS, Tandil, Buenos Aires, Argentina.
Centro de Investigaciones en Física e Ingeniería del Centro de la Provincia de Buenos Aires (CIFICEN), UNCPBA-CICPBA-CONICET, Pinto 399, 7000 Tandil, Argentina.
Sci Total Environ. 2024 Jan 10;907:167890. doi: 10.1016/j.scitotenv.2023.167890. Epub 2023 Oct 16.
Air particle pollution is a current issue that can cause adverse problems to human health and the urban environment. A fraction of these emitted particles is magnetite and iron-rich materials, which may be accumulated by biological indicators and effectively characterized by environmental magnetism methods. Thus, we studied this emitted particle fraction using the epiphytic species Tillandsia capillaris growing in northwestern Argentina's urban, suburban, and rural areas. The accumulated airborne magnetic particles' properties revealed valuable information regarding potentially toxic elements, magnetic mineralogy, sizes, morphology, and concentration. Magnetite was detected in samples from all studied areas, and its remanent coercivity values (H = 32.1-42.6 mT) in (sub)urban sites are similar to other reported cities in Latin America. The concentration of these airborne magnetic particles AMP varied between urban sites (mean and (s.d.) values of in situ magnetic susceptibility κ = 16.2 (9.4) × 10 SI, and specific magnetic susceptibility χ = 61.9 (31.4) × 10 m kg) and suburban sites (κ = 13.9 (9.9) × 10 SI, and χ = 43.9 (32.2) × 10 m kg), and it was distinctively higher than in clean sites. The spatial distribution of AMP was analyzed using a geostatistical model for the concentration-dependent magnetic parameter κ, which showed zones with high magnetic particle accumulation associated with vehicular traffic in the city and industrial emission in a suburban site. Among concentration-dependent magnetic parameters, the κ is recommended for magnetic biomonitoring because Tillandsia species' individuals are not processed for laboratory measurements, preserving them and allowing us the possibility of measurements over time.
空气颗粒物污染是当前的一个问题，可能会对人类健康和城市环境造成不利影响。这些排放的颗粒物中有一部分是磁铁矿和富铁物质，这些物质可能被生物标志物积累，并通过环境磁学方法有效地进行特征描述。因此，我们研究了生长在阿根廷西北部城市、郊区和农村地区的附生植物 Tillandsia capillaris 中这种排放颗粒的部分。积累的空气传播磁性颗粒的特性提供了有关潜在有毒元素、磁性矿物学、大小、形态和浓度的有价值的信息。在所有研究区域的样品中都检测到了磁铁矿，其剩余矫顽力值 (H = 32.1-42.6 mT) 在（城郊）站点与拉丁美洲其他报告的城市相似。这些空气传播磁性颗粒 AMP 的浓度在城市站点（现场磁化率 κ 的平均值和 (s.d.) 值为 16.2 (9.4) × 10 SI，比磁化率 χ = 61.9 (31.4) × 10-3 m3 kg）和郊区站点（κ = 13.9 (9.9) × 10 SI， χ = 43.9 (32.2) × 10-3 m3 kg）之间存在差异，并且明显高于清洁站点。使用浓度依赖型磁性参数 κ 的地质统计学模型分析了 AMP 的空间分布，该模型显示了与城市车辆交通和郊区站点工业排放相关的高磁性颗粒积累区域。在浓度依赖型磁性参数中，推荐使用 κ 进行磁性生物监测，因为 Tillandsia 物种的个体不需要进行实验室测量，这样可以保存它们，并使我们有可能进行长期测量。
