10.6084/m9.figshare.5649589.v1 Lei Wang Lei Wang Jianmei Liu Jianmei Liu Jining Liu Jining Liu Lili Shi Lili Shi Zhen Wang Zhen Wang Application of microcosm and species sensitivity distribution approaches in the ecological hazard assessment of 4-tert-butylphenol Taylor & Francis Group 2017 Microcosm 4-tert-butylphenol species sensitivity distribution ecological hazard assessment 2017-11-30 14:04:50 Journal contribution https://tandf.figshare.com/articles/journal_contribution/Application_of_microcosm_and_species_sensitivity_distribution_approaches_in_the_ecological_hazard_assessment_of_4-tert-butylphenol/5649589 <p>In order to evaluate the ecological hazard of 4-tert-butylphenol (4-TBP), species abundances and physicochemical properties were monitored for 63 days in a microcosm system containing planktonic algae, rotifers, shrimps and <i>Daphnia</i>. The 63 days-NOEC (no observed effect concentration) of 4-TBP for this system was calculated. At the same time, species sensitivity distribution curves were constructed based on the toxicity data of EC<sub>10</sub>, EC<sub>50</sub> and NOEC derived from laboratory single-species toxicity tests, which further gives no obvious hazard concentrations for 95% species in the ecosystem (HC<sub>5</sub>). In both the microcosm and the single-species tests, the shrimp (<i>Neocaridina</i> sp<i>.</i>) was the most sensitive species to 4-TBP exposure, while most algae species were relatively insensitive compared to the zooplankton. For the microcosm exposed to 4-TBP, significant changes occurred to the community structure instead of the community function, resulting in a NOEC<sub>microcosm</sub> of 265.38 μg L<sup>–1</sup> which approached the EC<sub>10</sub>-based HC<sub>5</sub> (0.376 mg L<sup>–1</sup>). Nevertheless, EC<sub>50</sub>-based HC<sub>5</sub> was higher than the NOEC<sub>microcosm</sub>, and the NOEC-based HC<sub>5</sub> was lower. The data showed that the EC<sub>10</sub>-based HC<sub>5</sub> was protective at the similar level with the result of microcosm for 4-TBP, providing supportive data for chemical risk assessment.</p>