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利用苔藓生物监测技术和TXRF分析评估墨西哥托卢卡山谷大都市区重金属的空间变异性。

Assessment of spatial variability of heavy metals in Metropolitan Zone of Toluca Valley, Mexico, using the biomonitoring technique in mosses and TXRF analysis.

作者信息

Zarazúa-Ortega Graciela, Poblano-Bata Josefina, Tejeda-Vega Samuel, Ávila-Pérez Pedro, Zepeda-Gómez Carmen, Ortiz-Oliveros Huemantzin, Macedo-Miranda Guadalupe

机构信息

Environmental Science Division, National Institute for Nuclear Research, Carretera México-Toluca S/N, La Marquesa, 52750 Ocoyoacac, MEX, Mexico.

出版信息

ScientificWorldJournal. 2013 Jun 17;2013:426492. doi: 10.1155/2013/426492. Print 2013.

DOI:10.1155/2013/426492
PMID:23853536
原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC3703337/
Abstract

This study is aimed at assessing atmospheric deposition of heavy metals using the epiphytic moss genera Fabronia ciliaris collected from six urban sites in the Metropolitan Zone of the Toluca Valley in Mexico. The concentrations of K, Ca, Ti, V, Cr, Mn, Fe, Ni, Cu, Zn, Rb, Sr, and Pb were determined by total reflection X-ray fluorescence technique. Results show that the average metal concentration decrease in the following order: Fe (8207 mg/Kg) > Ca (7315 mg/Kg) > K (3842 mg/Kg) > Ti (387 mg/Kg) > Mn, Zn (191 mg/Kg) > Sr (71 mg/Kg) > Pb (59 mg/Kg) > Cu, V (32 mg/Kg) > Cr (24 mg/Kg) > Rb (13 mg/Kg) > Ni (10 mg/Kg). Enrichment factors show a high enrichment for Cr, Cu, Zn, and Pb which provides an evidence of anthropogenic impact in the industrial and urban areas, mainly due to the intense vehicular traffic and the fossil fuel combustion. Monitoring techniques in mosses have proved to be a powerful tool for determining the deposition of heavy metals coming from diverse point sources of pollution.

摘要

本研究旨在利用从墨西哥托卢卡山谷大都市区六个城市地点采集的附生苔藓类植物纤枝赤藓来评估大气中重金属的沉降情况。通过全反射X射线荧光技术测定了钾、钙、钛、钒、铬、锰、铁、镍、铜、锌、铷、锶和铅的浓度。结果表明，金属平均浓度按以下顺序降低：铁（8207毫克/千克）>钙（7315毫克/千克）>钾（3842毫克/千克）>钛（387毫克/千克）>锰、锌（191毫克/千克）>锶（71毫克/千克）>铅（59毫克/千克）>铜、钒（32毫克/千克）>铬（24毫克/千克）>铷（13毫克/千克）>镍（10毫克/千克）。富集因子表明铬、铜、锌和铅有高度富集，这证明了工业和城市地区存在人为影响，主要是由于密集的车辆交通和化石燃料燃烧。苔藓监测技术已被证明是确定来自各种污染点源的重金属沉降的有力工具。

https://cdn.ncbi.nlm.nih.gov/pmc/blobs/c69f/3703337/c61b53572b90/TSWJ2013-426492.002.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/c69f/3703337/2756d2ce21d7/TSWJ2013-426492.001.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/c69f/3703337/c61b53572b90/TSWJ2013-426492.002.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/c69f/3703337/2756d2ce21d7/TSWJ2013-426492.001.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/c69f/3703337/c61b53572b90/TSWJ2013-426492.002.jpg

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