Singer M M, George S, Jacobson S, Lee I, Weetman L L, Tjeerdema R S, Sowby M L
Department of Chemistry and Biochemistry, University of California, Santa Cruz 95064, USA.
Ecotoxicol Environ Saf. 1996 Nov;35(2):183-9. doi: 10.1006/eesa.1996.0098.
The acute aquatic toxicity of a new Corexit series dispersant, Corexit 9500, was evaluated and compared with that of others in the series using early life stages of two common nearshore marine organisms: the red abalone (Haliotis rufescens) and a kelp forest mysid (Holmesimysis costata). Spiked-concentration testing was performed under closed, flowthrough conditions, with dispersant concentrations measured in real time using UV spectrophotometry. Median-effect concentrations ranged from 12.8 to 19.7 initial ppm for Haliotis and from 158.0 to 245.4 initial ppm for Holmesimysis. The difference in sensitivity of the two types of tests was consistent with patterns seen with other oil dispersants. Also, these data indicate Corexit 9500 to be of similar toxicity to Corexit 9527 and 9554. Corexit 9500 represents a reformulation of a long-time industry "standard," Corexit 9527, to allow use on higher viscosity oils and emulsions. The present data suggest that acute aquatic toxicity concerns surrounding the use of this newer dispersant should not be significantly different from those associated with the use of Corexit 9527.
对新型科里希特系列分散剂Corexit 9500的急性水生毒性进行了评估，并与该系列中的其他产品进行了比较，使用了两种常见近岸海洋生物的早期生命阶段：红鲍（Haliotis rufescens）和海带林糠虾（Holmesimysis costata）。在封闭的流通条件下进行加标浓度测试，使用紫外分光光度法实时测量分散剂浓度。对红鲍而言，半数效应浓度范围为初始浓度12.8至19.7 ppm，对海带林糠虾而言，半数效应浓度范围为初始浓度158.0至245.4 ppm。两种测试类型的敏感性差异与其他油类分散剂的情况一致。此外，这些数据表明Corexit 9500的毒性与Corexit 9527和9554相似。Corexit 9500是长期行业“标准”产品Corexit 9527的重新配方，以允许用于更高粘度的油类和乳液。目前的数据表明，围绕这种新型分散剂使用的急性水生毒性问题与使用Corexit 9527相关的问题应该没有显著差异。
