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Heavy metals biomonitoring in the Mexico City metropolitan area

机译：墨西哥城市区的重金属生物监测

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Abstract: Foliose lichens genera Parmotrema sp. and Parmelia sp. were used to monitor airborne heavy metal pollution in the Mexico City Metropolitan Area (MCMA). The samples were taken every three months in four selected places surrounding the urban areas (N, S, W, E). Also, another place far from the influence of the city was chosen as a reference site, and, lichens dwelling in Juniperus sp. twigs were transplanted from this site to our facilities in Mexico City and placed hanging from tree branches in order to measure the metal accumulation values in known time periods. Eight metals were measured (Pb, Cr, Cu, Fe, Zn, Cd, K, and Ca) due to their importance in the automobile and industrial pollution sector. The results show that lichens growing in near the MCMA get concentrations one order of magnitude over the lichens growing in the distant reference site. In particular Pb, Cu, and Zn present higher values south of the city which is in accordance with the dominant winds. Regarding the transplanted lichens, a significant increase in the concentration of Pb, Cu, and Zn was found after a nine month period.!11
机译：摘要：叶面地衣属Parmotrema sp.。和Parmelia sp。用于监测墨西哥城大都会区（MCMA）的空气中重金属污染。每三个月从市区（N，S，W，E）周围的四个选定地点采集样本。此外，另一个远离城市影响的地方被选为参考地点，地衣居住在杜松属。将树枝从此地点移植到我们在墨西哥城的工厂，并悬挂在树枝上，以测量已知时间段内的金属累积值。由于八种金属在汽车和工业污染领域的重要性，因此对它们进行了测量（Pb，Cr，Cu，Fe，Zn，Cd，K和Ca）。结果表明，在MCMA附近生长的地衣的浓度比在远处参考点生长的地衣的浓度高一个数量级。特别是，Pb，Cu和Zn在城市南部呈现较高的值，这与主要风向一致。关于移植的地衣，在九个月的时间后发现铅，铜和锌的浓度显着增加！11

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