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* 公益財団法人国際科学振興財団 〒305-0821 茨城県つくば市春日 3-24-16 ** 独立行政法人国立環境研究所 〒305-0053 茨城県つくば市小野川 162 *** 国立大学法人福島大学 〒960-1248 福島県福島市金谷川 1 ¶ 連絡先: kaxtuku.hiko@gmail.com Abstract Aquatic microcosm tests were performed to determine the ecotoxicological effect of alcohol ethoxylate (AE, C12, EO7). Compared with the control system, the population did not decrease in the system with 2 mg·L -1 AE. In the systems with 10 and 25 mg·L -1 AE, the population of fewer species decreased but recovered immediately. A massive decrease or increase in the population was observed in the systems with 50 and 100 mg·L -1 AE, and the microcosm compositional balance was changed. Through the analysis of production (P) and respiration (R) using the change in the dissolved oxygen concentration in the microcosm, it was found that the system with 2 mg·L -1 AE showed no signifi cant difference from the control. However, there were significant differences in the 10 and 25 mg·L -1 systems. Thus, it can be judged that the AE has an effect when its concentration is over 10 mg·L -1 . In addition, the ecosystem function recovered at the second day after the addition of 10 mg·L -1 AE and at the seventh day after the addition of 25 mg·L -1

Assessment of Ecosystem Effect of Alcohol Ethoxylate by Production and Respiration as an Indicator Using Microcosm