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Sensitivity of ecological soil-screening levels for metals to exposure model parameterization and toxicity reference values.

Sample BE, Fairbrother A, Kaiser A, Law S, Adams B - Environ. Toxicol. Chem. (2014)

Bottom Line: Soil ingestion ranked 2nd for carnivores and herbivores, but was 4th for invertivores.The approach for TRV selection was also examined in detail, with Cu as the representative analyte.The underlying assumption that generic body-weight-normalized TRVs can be used to derive protective levels for any species is not supported by the data.

View Article: PubMed Central - PubMed

Affiliation: Ecological Risk, Rancho Murieta, California, USA.

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Mean ranks of estimated soil concentration distributions for analytes displaying statistically significant interactions between model parameters and receptor trophic groups. Note that higher rank values correspond to higher importance. TRV = toxicity reference value; FIR = food ingestion rate.
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fig01: Mean ranks of estimated soil concentration distributions for analytes displaying statistically significant interactions between model parameters and receptor trophic groups. Note that higher rank values correspond to higher importance. TRV = toxicity reference value; FIR = food ingestion rate.

Mentions: In contrast, relative importance of parameters differed by trophic group. Soil ingestion was ranked as the 2nd most important parameter for carnivores and herbivores, but it was the 4th most important for invertivores (Table 2). Statistically significant interactions for trophic group and model parameters were also observed for Co, Cu, Pb, V, and Zn (Figure 1). Reciprocal relationships were evident for groups of parameters. For example, as FIR, bioaccumulation, and food bioavailability increased in importance, soil ingestion and soil bioavailability decreased. Soil ingestion and soil bioavailability exhibited greater importance for herbivores and carnivores for Cu and Pb and dominated exposure of carnivores and zinc (Figure 1). These extreme soil concentration estimates occur when soil ingestion is minimized in the model and all exposure therefore must be derived from the diet.


Sensitivity of ecological soil-screening levels for metals to exposure model parameterization and toxicity reference values.

Sample BE, Fairbrother A, Kaiser A, Law S, Adams B - Environ. Toxicol. Chem. (2014)

Mean ranks of estimated soil concentration distributions for analytes displaying statistically significant interactions between model parameters and receptor trophic groups. Note that higher rank values correspond to higher importance. TRV = toxicity reference value; FIR = food ingestion rate.
© Copyright Policy - open-access
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC4282090&req=5

fig01: Mean ranks of estimated soil concentration distributions for analytes displaying statistically significant interactions between model parameters and receptor trophic groups. Note that higher rank values correspond to higher importance. TRV = toxicity reference value; FIR = food ingestion rate.
Mentions: In contrast, relative importance of parameters differed by trophic group. Soil ingestion was ranked as the 2nd most important parameter for carnivores and herbivores, but it was the 4th most important for invertivores (Table 2). Statistically significant interactions for trophic group and model parameters were also observed for Co, Cu, Pb, V, and Zn (Figure 1). Reciprocal relationships were evident for groups of parameters. For example, as FIR, bioaccumulation, and food bioavailability increased in importance, soil ingestion and soil bioavailability decreased. Soil ingestion and soil bioavailability exhibited greater importance for herbivores and carnivores for Cu and Pb and dominated exposure of carnivores and zinc (Figure 1). These extreme soil concentration estimates occur when soil ingestion is minimized in the model and all exposure therefore must be derived from the diet.

Bottom Line: Soil ingestion ranked 2nd for carnivores and herbivores, but was 4th for invertivores.The approach for TRV selection was also examined in detail, with Cu as the representative analyte.The underlying assumption that generic body-weight-normalized TRVs can be used to derive protective levels for any species is not supported by the data.

View Article: PubMed Central - PubMed

Affiliation: Ecological Risk, Rancho Murieta, California, USA.

Show MeSH
Related in: MedlinePlus