John Wiley & Sons, Ltd.

Extension and validation of the target lipid model for deriving predicted no effect concentrations for soils and sediments

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Substance risk assessments require estimation of predicted no‐effect concentrations (PNEC) in soil and sediment. The present study applies the target lipid (TLM) and equilibrium partitioning (EqP) models to toxicity data to evaluate the extrapolation of the TLM‐derived aquatic PNEC to these compartments. This extrapolation assumes the sensitivity of aquatic species is similar to terrestrial and benthic species. The acute species sensitivity distribution (SSD), expressed in terms of species‐specific critical target lipid body burdens (CTLBBs), was computed using the TLM‐EqP framework and found to span a similar range as the aquatic organism SSD but with a slightly lower median value (<2x). The SSD for acute to chronic ratios (ACRs) also exhibited a similar range and distribution across species suggesting similar mechanisms of action. This hypothesis was further tested by comparing empirical soil/sediment chronic effect levels to the calculated PNEC derived using TLM‐EqP. Results showed that 95% of the compiled chronic effects data fell above the PNEC confirming an adequate protection level. These findings support the conclusion that TLM‐derived aquatic PNECs can be successfully extrapolated to derive credible PNECs for soil and sediment compartments. Environ Toxicol Chem © 2014 SETAC

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