Evaluation of Heavy Metal Contamination Potential in Surface Soil of Oil Pipelines in the North of Persian Gulf

Abstract

The purpose of this study was to determine the concentration of heavy metals (Pb, Ni, Cr and V) in soil and evaluate the potential environmental risk of heavy metals in the surface soils of Assaluyeh-Bandar Abbas gas condensates pipeline base. For this purpose, 10 stations were randomly selected in a longitudinal transect and soil sampling was performed. Acid digestion of samples was performed and after their filteration, the concentration of each heavy metal was measured using atomic absorption spectroscopy thriugh calibration solutions. According to the results obtained, the mean concentrations of pb, Ni, Cr and V heavy metals in the study area were be 7.4±1.4, 42.5±2.4, 53.6±5.9 and 19.7± 2.5 mg/kg, respectively. As the findings of this work were all in the permissible level provided in national environmental standards, it was proved that the construction of the pipeline did not result in heavy metal contamination in the environment. However, human activities may have increased the concentration of metals. In this study, significant correlations were observed between Pb and V (P<0.01) and Cr and V (P<0.05) and also between Ni and Cr (P<0.05). The results of calculating geoaccumulation (Igeo), modified concentration degree (mCd) and potential ecological risk indices showed that the soils of studied areas were as unpolluted soil, very low pollution and low potential ecological risk categories, respectively.

Keywords

• assessment
• heavy metals
• petroleum pollution
• petroleum compounds
• surface soil
• transmission lines