John Wiley & Sons, Ltd.

Deriving site‐specific clean‐up criteria to protect ecological receptors (plants and soil invertebrates) exposed to metal or metalloid soil contaminants via the direct contact exposure pathway

0
Soil contaminant concentration limits for the protection of terrestrial plants and soil invertebrates are commonly based on thresholds derived using data from laboratory ecotoxicity tests. A comprehensive assessment has been made for the derivation of Ecological Soil Screening Levels (Eco‐SSL) in the United States of America (USA); however, these limits are conservative because of their focus on high bioavailability scenarios. Here, we explain and evaluate approaches to soil limit derivation taken by four jurisdictions, two of which allow for correction of data for factors affecting bioavailability among soils, and between spiked and field contaminated soils (REACH Regulation, European Union; and NEPC, Australia). Scientifically advanced features from these methods have been integrated into a newly developed method for deriving soil clean‐up values (SCVs) within the context of site‐specific baseline ecological risk assessment. Resulting site‐specific SCVs that account for bioavailability may permit a greater residual concentration in soil when compared to generic screening limit concentrations (e.g., Eco‐SSL), while still affording acceptable protection. Two choices for selecting the level of protection are compared (i.e., allowing higher effect levels per species, or allowing a higher percentile of species that are potentially unprotected). Implementation of this new method is presented for the jurisdiction of the USA, with a focus on metal and metalloid contaminants; however, the new method can be utilized in any jurisdiction. A case study for molybdate shows the large effect of bioavailability corrections, and smaller effects of protection level choices, when deriving SCVs. Integr Environ Assess Manag © 2014 SETAC

Customer comments

No comments were found for Deriving site‐specific clean‐up criteria to protect ecological receptors (plants and soil invertebrates) exposed to metal or metalloid soil contaminants via the direct contact exposure pathway. Be the first to comment!