Issue 1, 2018

The influence of chemical degradation during dietary exposures to fish on biomagnification factors and bioaccumulation factors

Abstract

The chemical dietary absorption efficiency (ED) quantifies the amount of chemical absorbed by an organism relative to the amount of chemical an organism is exposed to following ingestion. In particular, ED can influence the extent of bioaccumulation and biomagnification for hydrophobic chemicals. A new ED model is developed to quantify chemical process rates in the gastrointestinal tract (GIT). The new model is calibrated with critically evaluated measured ED values (n = 250) for 80 hydrophobic persistent chemicals. The new ED model is subsequently used to estimate chemical reaction rate constants (kR) assumed to occur in the lumen of the GIT from experimental dietary exposure tests (n = 255) for 165 chemicals. The new kR estimates are corroborated with kR estimates for the same chemicals from the same data derived previously by other methods. The roles of kR and the biotransformation rate constant (kB) on biomagnification factors (BMFs) determined under laboratory test conditions and on BMFs and bioaccumulation factors (BAFs) in the environment are examined with the new model. In this regard, differences in lab and field BMFs are highlighted. Recommendations to address uncertainty in ED and kR data are provided.

Graphical abstract: The influence of chemical degradation during dietary exposures to fish on biomagnification factors and bioaccumulation factors

Supplementary files

Article information

Article type
Paper
Submitted
10 Nov. 2017
Accepted
21 Dec. 2017
First published
22 Dec. 2017

Environ. Sci.: Processes Impacts, 2018,20, 86-97

The influence of chemical degradation during dietary exposures to fish on biomagnification factors and bioaccumulation factors

J. A. Arnot and D. Mackay, Environ. Sci.: Processes Impacts, 2018, 20, 86 DOI: 10.1039/C7EM00539C

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