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首页> 外文期刊>Environmental toxicology and chemistry >Acute to chronic ratios in aquatic toxicity--variation across trophic levels and relationship with chemical structure.
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Acute to chronic ratios in aquatic toxicity--variation across trophic levels and relationship with chemical structure.

机译:水生毒性的急性与慢性比率-营养水平之间的差异以及与化学结构的关系。

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摘要

For fish, daphnids, and algae, acute to chronic ratios (ACRs) have been determined from experimental data regarding new and existing chemicals. Only test results in accord with the European Union Technical Guidance Document (TGD) and validated by authorities were considered. Whereas the median ACRs of 10.5 (fish), 7.0 (daphnids), and 5.4 (algae) are well below the ACR safety factor of 100 as implied by the TGD, individual ACRs vary considerably and go up to 4400. The results suggest that a safety factor of 100 is not protective for all chemicals and trophic levels. Neither a correlation between ACR and baseline toxicity as modeled through the logarithmic octanol-water partition coefficient nor an ACR correlation across trophic levels exists. Narcosis is associated with a preference for a low ACR; nevertheless, low ACRs are frequently obtained for nonnarcotics. Analysis of chemical structures led to the derivation of structural alerts to identify compounds with a significantly increased potential for a high ACR, which may prove to be useful in setting test priorities. At present, however, life-cycle tests are the only way to conservatively predict long-term toxicity.
机译:对于鱼类,水蚤和藻类,已根据有关新化学品和现有化学品的实验数据确定了急性与慢性比率(ACR)。仅考虑符合欧盟技术指导文件(TGD)并经当局验证的测试结果。尽管TGD所隐含的ACR的中位数分别为10.5(鱼类),7.0(水蚤)和5.4(藻类),远低于ACR安全系数100,但单个ACR的差异却很大,最高可达4400。安全系数100并非对所有化学品和营养水平均具有保护作用。通过对数辛醇-水分配系数模拟的ACR和基线毒性之间的相关性,也不存在营养级上的ACR相关性。麻醉与低ACR相关。但是,非麻醉品经常获得低ACR。化学结构分析导致派生结构警报,以鉴定出具有显着增加的高ACR潜力的化合物,这可能对确定测试优先级很有用。但是,目前,生命周期测试是保守地预测长期毒性的唯一方法。

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