Residues of polycyclic aromatic hydrocarbons (PAHs), polychlorinated biphenyls (PCBs) and organochlorine pesticides in organically-farmed vegetables [An article from: Chemosphere]

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Description:
The residues of polyaromatic hydrocarbons (PAHs), polychlorinated biphenyls (PCBs) and organochlorine pesticides (OCPs) in soils from organic farms and their uptake by four varieties of organic-produced potatoes and three varieties of organic carrots from England were investigated. Samples of the soils, crop peels and cores were all Soxhlet-extracted in triplicate, cleaned up by open-column chromatography and analysed by a multi-residue analytical method using gas chromatography with mass selective detection. The concentrations of PAHs, PCBs and OCPs in soils from organic farms ranged from 590+/-43 to 2301+/-146@mg/kg, 3.56+/-0.73 to 9.61+/-1.98@mg/kg and 52.2+/-4.9 to 478+/-111@mg/kg, respectively. Uptake by different crop varieties were 8.42+/-0.93 to 40.1+/-4.9@mg/kg @SPAHs, 0.83+/-0.19 to 2.68+/-0.94@mg/kg @SPCBs and 8.09+/-0.83 to 133+/-27@mg/kg @SOCPs. Residue uptake from soils depended on plant variety; Desiree potato and Nairobi carrot varieties were more susceptible to PAH contamination. Likewise, uptake of PCBs and OCPs depended on potato variety. There were significant positive correlations between the PCB and OCP concentrations (P