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Fig. 4. (A) Mineralization of 14C-phenanthrene in inoculated clay soil I slurries before (circles) and after (triangles) exposure to an electric field. The numbers denote maximum mineralization rates in mg kg–1 h–1. (B) Mean concentration of native polycyclic aromatic hydrocarbons (PAH) in soil after bioavailability assay without (grey bars) and with (black bars) electrokinetic pretreatment. Error bars correspond to one standard deviation of measurements in duplicate flasks. No error bars are shown in (B) for results without pretreatment because the results correspond to one single flask. The detection limit for fluorene was 54 µg kg–1. Abbreviations: Flne, Fluorene; Phe, phenanthrene; Ant, anthracene; Ftne, Fluoranthene; Pyr, pyrene; B(a)pyr, benzo(a)pyrene; Crys, chrysene.
