Mechanistic modeling of the bioconcentration of (super)hydrophobic compounds in Hyalella azteca

Andrea Ebert1, Juliane Ackermann2, Kai‐Uwe Goss3
1Analytical Environmental Chemistry, Helmholtz Centre for Environmental Research—UFZ, 04318, Leipzig, Germany
2Section IV 2.3 “Chemicals”, Umweltbundesamt, 06844, Dessau-Roßlau, Germany
3Institute of Chemistry, Martin Luther University Halle-Wittenberg, 06120, Halle, Germany

Tóm tắt

AbstractBioconcentration tests using the freshwater amphipod Hyalella azteca as an alternative to conventional fish tests have recently received much attention. An appropriate computational model of H. azteca could help in understanding the mechanisms behind bioconcentration, in comparison to the fish as test organism. We here present the first mechanistic model for H. azteca that considers the single diffusive processes in the gills and gut. The model matches with the experimental data from the literature quite well when appropriate physiological information is used. The implementation of facilitated transport was essential for modeling. Application of the model for superhydrophobic compounds revealed binding to organic matter and the resulting decrease in bioavailable fraction as the main reason for the observed counterintuitive decrease in uptake rate constants with increasing octanol/water partition coefficient. Furthermore, estimations of the time needed to reach steady state indicated that durations of more than a month could be needed for compounds with a log Kow > 8, limiting the experimental applicability of the test. In those cases, model-based bioconcentration predictions could be a preferable approach, which could be combined with in vitro biotransformation measurements. However, our sensitivity analysis showed that the uncertainty in determining the octanol/water partition coefficients is a strong source of error for superhydrophobic compounds.

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