supercritical fluid extraction of persistent organic pollutants from natural and artificial soils and comparison with bioaccumulation in earthworms selective supercritical fluid extraction ssfe was used as a measurement of compound chemical accessibility and as a predictor of compound bioavailability from three natural soils and artificial analogues prepared to have comparable total organic carbon content soils spiked with phenanthrene pyrene pcb 153 lindane and ppddt were aged for 0 14 28 or 56 days and then selectively extracted by supercritical fluid extraction compounds exhibited decreasing extractability with increasing pollutantsoil contact time and increasing total organic carbon content in tested soils however the different extractability of compounds from artificial and natural pairs having comparable toc indicates the limitations of using toc as an extrapolation basis between various soils the comparison of extractability with bioaccumulation by earthworms eisenia fetida previously published by vlkov and hofman 2012 showed that only for pahs it was possible to predict their bioaccumulation by means of selective sfe