Soil contamination beneath asphalt roads by polynuclear aromatic hydrocarbons, zinc, lead and cadmium
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A total of 74 surface soil samples were collected and analyzed for polycyclic aromatic hydrocarbons(PAHs) and the contents and pollution levels of 15 PAH compounds in different types of surface soils of Huzhou were studied.Results show that the highest content of PAHs could be found in Huzhou urban.The ratio of low circle PAHs/high circle PAHs were less than 1,and the ratio of pyrene/benzo(a)pyrene were less than 2.This means that the PAHs pollution in Huzhou soils was mainly from the burning coal and domestic pollution.
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This environmental study is focused on the distribution of heavy metals in the soils of selected localities in Brno. The soils samples were collected near roadsides and the concentrations of Cd, Cu, Pb and Hg were determined with using atomic absorption spectrometry. The contamination of soils from selected localities was evaluated on the basis of the pollution index, contamination factor and degree of contamination; and the limit contents of heavy metals in soils which is listed in the Guidance MŽP Czech Republic were also used for assessing the contamination. Mercury and cadmium have been identified as the main polluting metals in selected localities with a high transport load. The obtained results also confirmed that the environment of Brno can be characterized as an area of uncontaminated to a moderate degree contaminated in relation to the contamination factor and contamination degree of the environment in the case of metals (Cd, Cu, Pb, and Hg).
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Air pollution has been considered one of the major environmental challenges because of its effect on ecosystems and human health. The concentration levels and sources of heavy metals contamination were studied in road dust samples collected from various locations including four different activity areas: industrial, highways, residential and mixed use in Delhi, India. Metal content in road dust was analyzed by inductively coupled plasma atomic emission spectroscopy. The results showed high concentration levels of Ni, Cr and Pb in industrial areas. Pearson’s correlations coupled with principal component analysis revealed that Cd, Cr, Ni and Pb are associated with industrial sources whereas Zn and Cu are mainly contributed by vehicular traffic. Road dust contamination was assessed by various methods: degree of contamination, potential ecological index and pollution index. Contamination factor analysis showed that road dust samples are significantly contaminated by Zn and Pb. The potential ecological indices indicated high contamination of Cd and moderate contamination of Pb in road dust, but low contamination of Cr, Cu, Ni and Zn. The pollution index of most of the metals was higher than 1, indicating deterioration of road dust quality of Delhi city due to anthropogenic emissions. The degree of contamination, the potential ecological index and the integrated pollution index reveal that road dust from industrial, mixed use and highway areas are highly contaminated by heavy metals. The road dust from the residential area is also contaminated considerably. Evaluations by various methods indicated that all assessment methods are important for environmental quality evaluation.
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The contamination and variatio of Polycyclic Aromatic Hydrocarbons(PAHs) in the Air of Zhengzhou city was studied Results showed that the concentrations of PAHs and Benz(a)pyrene were ND～698ng/m~3and 1.56～136ng/m~3.The variational regulation in different seasons and different areas is(1)winterautumnspringtimesummer and(2) industrial estateomnibus areadense transportain areaculture areacheck.
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