Dipartimento di Biologia, Università Degli Studi di Napoli Federico II, Via Cinthia, 80126, Napoli, Italy.
CeSMA-Centro Servizi Metrologici Avanzati, Università Degli Studi di Napoli Federico II, Via Cinthia, 80126, Napoli, Italy.
Chemosphere. 2019 Mar;218:340-346. doi: 10.1016/j.chemosphere.2018.11.133. Epub 2018 Nov 21.
The study of particulate matter pollution in urban areas is of great concern due its adverse effects on human health. Roadside vegetation, intercepting and filtering it, contributes to improve air quality. The aim of the research was to investigate the capability of Q. ilex leaves, already known good biomonitors of air quality, in filtering air metals. Besides, the main derivation (i.e. air or root uptake) of the investigated metals in leaf tissue was evaluated. The concentrations of Cd, Cr, Cu, Ni and Pb were measured in three groups of Q. ilex leaves (unwashed, water washed and chloroform washed). Besides, several leaf traits (i.e. length, width, petiole length, leaf area, leaf mass area and thickness) were evaluated. The findings highlighted that Cd, Cr, Cu, Ni and Pb in Q. ilex leaves exceeded the chemical fingerprint. In particular, Cd and Pb appeared the main contaminants of the investigated area as also after water washing of the leaves, their concentrations exceeded the chemical fingerprint. Ni, Cr and Pb appeared to be accumulated on leaf deposit; whereas, Cd appeared mainly adsorbed to leaf cuticle. Higher leaf width, lower leaf area and shorter petiole favoured leaf metal accumulation. Root uptake and translocation to leaves cannot be excluded for Cr and Ni; whereas, leaf Cu content would seem to depend on both leaf deposit and soil content. In conclusion, Q. ilex can be useful in filtering air metal pollution, especially for Ni, Cd, Cr and Pb, and improving air quality.
城市颗粒物污染的研究受到广泛关注，因为其对人类健康有不良影响。道路边的植被可以拦截和过滤颗粒物，有助于改善空气质量。本研究旨在调查已经被证明是空气质量良好生物监测器的冬青树叶过滤空气金属的能力。此外，还评估了研究金属在叶片组织中的主要来源（即空气或根部吸收）。在三组冬青叶（未清洗、水洗和氯仿洗）中测量了 Cd、Cr、Cu、Ni 和 Pb 的浓度。此外，还评估了几种叶片特征（即长度、宽度、叶柄长度、叶面积、叶质量面积和厚度）。研究结果表明，冬青叶中的 Cd、Cr、Cu、Ni 和 Pb 超过了化学指纹。特别是，Cd 和 Pb 似乎是该地区的主要污染物，即使对叶片进行水洗后，它们的浓度仍然超过了化学指纹。Ni、Cr 和 Pb 似乎在叶片沉积物上积累；而 Cd 主要吸附在叶片角质层上。叶片较宽、面积较小和叶柄较短有利于叶片金属的积累。Cr 和 Ni 不能排除根部吸收和向叶片转运；而叶片 Cu 含量似乎取决于叶片沉积物和土壤含量。总之，冬青可以有效地过滤空气金属污染，特别是对 Ni、Cd、Cr 和 Pb，从而改善空气质量。
