Bioconcentration of polycyclic aromatic hydrocarbons in vegetables grown in an industrial area.

The polycyclic aromatic hydrocarbon (PAH) content was determined in the inner tissue of various vegetable species and their growing environment (soil and atmosphere) in the greater industrial area of Thessaloniki, northern Greece. The lower molecular weight compounds dominated in both vegetable leaves and roots. Statistical analysis of variance showed that species and season are the factors that significantly affect PAH concentrations in inner vegetable tissue and soil, respectively. Principal component analysis indicated that the mixture of PAHs in inner vegetable tissue was very similar to that in air vapour thus suggesting gaseous deposition as the principal pathway for the accumulation of PAHs. Soil-to-vegetation and air-to-vegetation bioconcentration factors were calculated and their relationships with PAHs' physicochemical properties were investigated. Solubility and the octanol-water partition coefficient, as well as vapour pressure and the octanol-air partition coefficient were proved to be good predictors for the accumulation of PAHs in inner root and leaf tissue, respectively.

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