Environmental Impact Risk Assessment of Surfactant Alchol Ethoxylates Using Experimental Model Ecosystem with Aquatic Animals and Plants

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  • LU ZHIJIANG
    Graduate School of Life and Environmental Sciences, University of Tsukuba
  • KAKAZU KUNIHIKO
    Faculty of Symbiotic Systems Science, Fukushima University
  • SUGIURA NORIO
    Graduate School of Life and Environmental Sciences, University of Tsukuba
  • INAMORI RYUHEI
    Faculty of Symbiotic Systems Science, Fukushima University
  • XU KAIQIN
    National Institute for Environmental Studies School of Environmental Science and Engineering, Shanghai Jiao Tong University
  • MURAKAMI KAZUHITO
    Department of Life and Environmental Sciences, Chiba Institute of Technology
  • INAMORI YUHEI
    Faculty of Symbiotic Systems Science, Fukushima University

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Other Title
  • 大型水生動植物生態系モデルによる界面活性剤の生態環境リスク影響評価
  • オオガタ スイセイ ドウショクブツ セイタイケイ モデル ニ ヨル カイメン カッセイザイ ノ セイタイ カンキョウ リスク エイキョウ ヒョウカ

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Abstract

The discharge of domestic and industrial wastewater into water areas such as rivers and lakes has caused serious water pollution, and affected the growth of aquatic organisms. It is necessary to assess the effect of different chemical substances on the stability of aquatic ecosystem. The effects of trace chemical such as surfactant on single species including water flea, algal, and fish have been evaluated in OECD studies. In this study, the eco-risk assessment of surfactant Alchol Ethoxylates (AE) was analyzed using experimental model ecosystem comprising of scallops, fish, and submerged aquatic plants, according to the dynamic in individual number of organisms, and ratio of production to respiration (P/R) determined by DO meter. The results revealed that 1) judging from P/R ratio, DO pattern and number of individual organisms, AE has no influence on the large-scale model aquatic ecosystem at concentration of 2 mg•l－1, which was generally the same as the results of study on microcosm model ecosystem; 2) when the addition of AE concentrations reached to 3 mg•l－1 and 5 mg•l－1, the P and R were changes compared with the controls and the P/R ratio increase to more than 1. 3) when the addition of AE concentrations reached to 10 mg•l－1 and 20 mg•l－1, the P/R decreased to 0.43 and 0.26, respectively. After day 7, the P/R ratio recovered to beginning. These results suggest that as the surfactant AE can be potentially biodegraded, experimental model ecosystem composed large aquatic animals and plants can therefore be used as an effective tool to evaluate the environmental impact risk of chemical substances and stability of real ecosystem.

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