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Author: Kuldeep × End date: 2019 × Start date: 2019 × Thesis Type: M.Sc ×
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    ThesisItemOpen Access
    Studies on heavy metal contamination in soils around petrol filling stations
    (CCSHAU, 2019) Kuldeep; Jat, M.K.
    In order to study the effect of petrol filling station on heavy metals (Zn, Cu, Cd, Pb, Ni and Cr) content in soils of Ambala, Gurugram and Hisar district, soil samples were collected in close vicinity to petrol filling station and at a distance 5, 10, 15 and 20 m and the reference sample was collected from far away from petrol filling station at three depths of soil profile i.e. 0-15, 15-30 and 30-45 cm. Elemental analysis of samples was conducted using atomic absorption spectrophotometer. The soils were neutral to alkaline in reaction, safe in electrical conductivity and low in organic carbon. The EC, OC, pH, available N, P, and K were found higher in petrol filling station than reference soil samples. The EC, OC, available N, P, and K contents decreased while soil pH increased as soil depth increased. The results showed that the concentration of DTPA extractable heavy metal was high in the sample close to petrol filling station as compared to the reference samples. The order of available heavy metal content extracted by DTPA was Zn> Ni> Cu>Pb>Cd >Cr in Ambala, Zn>Cu>Pb>Ni>Cr>Cd in Gurugram and Pb>Cu>Zn>Ni>Cd>Cr in Hisar district. DTPA extractable heavy metal content was higher in surface soil and exhibited decreasing trend with depths in all soil profiles. In heavy metal fractions determinations, all the heavy metals (Zn, Cu, Cd, Pb, Ni and Cr) were present in abundant amount as residual fraction and minimum in as water soluble fraction. The DTPA extractable and total heavy metals (Zn, Cu, Cd, Pb, Ni and Cr) content decreased as the distance increased (5, 10, 15 and 20m) from the fuel filling station in all three districts. All heavy metals (Zn, Cu, Cd, Pb, Ni and Cr) were found within the permissible limit. These heavy metals (Zn, Cu, Cd, Pb, Ni and Cr) show positive and significant correlation with EC and OC of the soil. The study revealed that soil contamination by the heavy metals originated from a common anthropogenic source such as break wear, tyres wear, batteries, oil filling activity and corroded vehicles engine material.