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Metal contamination in urban street sediment in Pisa (Italy) can affect the production of antioxidant metabolites in Taraxacum officinale Weber 总被引:1,自引:0,他引:1
Francesca Bretzel Stefano Benvenuti Laura Pistelli 《Environmental science and pollution research international》2014,21(3):2325-2333
Taraxacum officinale Weber (dandelion) is a very ubiquitous species, and it can grow in urban environments on metal-polluted sediments deposited in the gutters. This study represents a preliminary step to verify the presence of metals in sediments collected in urban streets in Pisa and to assess the alteration in dandelion metabolites in order to understand its adaptation to polluted environments. The soil and sediments were collected at three urban streets and analyzed for total and extractable Cr, Pb, Cu, Ni, and Zn. The total values of Pb and Zn in street sediments exceeded the limits for residential areas of soils. Zn was the most mobile of the metals analyzed. Floating cultivations trials were set up with dandelion seedlings and street sediments. The metals were analyzed in roots and leaves. Antioxidant power, anthocyanins, polyphenols, non-protein thiols (NP-TH) and chlorophylls were measured in dandelion leaves. The first two parameters (anthocyanins and antioxidant power) were higher in the polluted samples compared to the control; chlorophyll content was lower in the treated samples, whereas NP-TH showed no differences. NP-TH groups determined in roots were associated with the root content of Zn and Pb. These results indicate that dandelion can tolerate plant stress by altering its metabolite content. 相似文献
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Urban soils are often contaminated by metals deriving from human activities. Urban polluted soils can affect human health
through direct physical contact or through the food chain. The behaviour of metals is affected by chemical and physical soil
properties. Heavy metal concentration was determined in some soils of three medium sized towns of coastal Tuscany, Central
Italy. Soil samples were collected in roadsides, urban agricultural soils (allotments), playgrounds and public parks. The
analysis included total metal content (Pb, Cu, Zn, Ni, Cd), and sequential extraction. Lead reached the highest levels in
the soils and was higher near roads. In urban agricultural soils and in allotments Cu was present in noticeable quantities
(300 mg kg−1). The presence of Cu in urban soils seems to be typical of soils used for a long period as agricultural land, especially
vineyards in the area covered by this study. Sequential extraction was performed to evaluate the mobility of the metals and
to better understand the impact of the anthropogenic activity on urban sites. In the present study principal components analysis
(PCA) is employed to describe the characteristics of urban soils. 相似文献
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Contribution of a municipal solid waste incinerator to the trace metals in the surrounding soil 总被引:5,自引:0,他引:5
This study analyses the pedological environment of the area near a municipal waste incinerator that has been operating in the south-east district of Pisa for approximately 20?years. There are many other industrial activities in the area besides the incinerator, which represent possible sources of pollution, as well as heavy road traffic. The study area was defined by a 0-4-km zone around the site with a population of approximately 12,000 residents. The study included the physical and chemical characterisation of 100 samples of soil and an analysis of trace metals such as Cr, Ni, Pb, Zn, Hg, As and Cd. The samples were grouped into soil use categories. The results showed Zn, Pb and Hg correlated with their potentially mobile fractions, and suggested an anthropic contribution to their presence in the soil. Ni, Cr and As showed values attributable to a lithological origin. This was consistent with the PCA results. The aim was to define the environmental state of the soil of the area in order to create a reference for future research and to verify the possible presence of pollution from other sources (local industrial activities and traffic). 相似文献
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