Distribution of polycyclic aromatic hydrocarbons in soils and corns, and its risk assessment in summer around Zhongyuan, oil field, China

摘要

The purpose of this study was to determine the degree of contamination with polycyclic aromatic hydrocarbons (PAHs) in samples of soils, and corn around three different oily sludges in Zhongyuan oil field in summer. The contents of PAHs in the soil samples from high to low were the Third Wenming oil sludge (3W) > the Third Mazhai oil sludge (3M) > the Fourth Wen'er oil sludge (4W). The contents of PAHs in the corn root and leaf samples from high to low were 3W > 3M >4W, 3W > 4W > 3M, respectively. This article also determined the health risk assessment and ecological risk assessment in soils. The evaluation results of Nemero index P show that the soils around Zhongyuan oil field in summer present 33.3% of those as 'heavily contaminated', 5.6% as 'medium contaminated', 44.4% as 'light contaminated'. So pollution from oily sludges should be paid more attention to.