Several studies show high variability in toxic response among species and PAH compounds. For example, the soil LC50 for many of the LPAHs were in the range of 40-167 mg/g soil for the springtail Folsomia fimetaria; however, for some of the more hydrophobic HPAHs (e.g., BaP and benz[a]anthracene), the 21 day LC50 was greater than 800-1000mgg1. At these concentrations, the HPAHs should be toxic, which implies a reduced bioaccumulation for these compounds. As is the case for many species, sublethal effect concentrations occur at levels usually 10-100 times lower than those causing mortality. Sublethal effects, such as reproductive and growth abnormalities, exhibit effect concentrations in the low ppm range (5-100 mgPAH/g of soil).
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