John Wiley & Sons, Ltd.

Chronic toxicity of selected polycyclic aromatic hydrocarbons to algae and crustaceans using passive dosing

0
Due to the large number of possible aromatic hydrocarbon structures, predictive toxicity models are needed to support substance hazard and risk assessments. Calibration and evaluation of such models requires toxicity data with well‐defined exposures. The present study has applied a passive dosing (PD) method to generate reliable chronic effects data for eight polycyclic aromatic hydrocarbons on the green algae, Pseudokirchneriella subcapitata and the crustacean, Ceriodaphnia dubia. The observed toxicity of these substances on algal growth rate and neonate production were then compared to available literature toxicity data for these species, as well as target lipid (TLM) and chemical activity based model predictions. The use of PD provided well controlled exposures that yielded more consistent data sets than attained by past literature studies. Results from the present study, which were designed to exclude the complicating influence of ultraviolet light, were found to be well described by both TLM and chemical activity effect models. The present study also found the lack of chronic effects for high molecular weight PAHs consistent with the limited chemical activity that could be achieved for these compounds in the aqueous test media. Findings from this analysis highlight that variability in past literature toxicity data for PAHs may be complicated by both poorly controlled exposures as well as photochemical processes that can modulate both exposure and toxicity. This article is protected by copyright. All rights reserved

Customer comments

No comments were found for Chronic toxicity of selected polycyclic aromatic hydrocarbons to algae and crustaceans using passive dosing. Be the first to comment!