Journal of Ecology and Rural Environment ›› 2018, Vol. 34 ›› Issue (1): 81-86.doi: 10.11934/j.issn.1673-4831.2018.01.010

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Acute and Chronic Toxicity of Nonylphenol Ethoxylates to Daphnia magna

CAI Xiao-yu1,2, JIANG Jin-lin2, SHAN Zheng-jun2, BU Yuan-qing2, XU Wei-li2   

  1. 1. Jiangsu Collaborative Innovation Center of Atmospheric Environment and Equipment Technology(CICAEET), Nanjing University of Information Science and Technology, Nanjing 210044, China;
    2. Key Laboratory of Pesticide Environmental Assessment and Pollution Control, Nanjing Institute of Environmental Sciences, Ministry of Environmental Protection, Nanjing 210042, China
  • Received:2017-03-02 Online:2018-01-25 Published:2018-01-26

Abstract:

An experiment was carried out to explore acute and chronic toxicity of nonylphenol ethoxylates (NP40EO) to Daphnia magna and the chronic effects of the substance on fatality, growth and reproduction of Daphnia magna after 21 days of exposure, in an attempt to establish a dose-response relationship between the two and search for sensitive biological indices. Results of the acute toxicity test show that the 48 h-EC50 of NP40EO to Daphnia magna was 14.23 mg·L-1. Results of the chronic toxicity test show that NP40EO had significant effects on the average number of molting, the first reproduction time, the total number of eggs per female, the number of brood per female and the average body length of survivors of the Daphnia magna. Among them, the exposure concentration of 0.445 mg·L-1 could significantly reduce the number of molting, the average number of brood, the total number of eggs per female, and the average body length. Therefore, it could be concluded that after overall consideration of all the indices that the lowest observed effect concentration (LOEC) of NP40EO for Daphnia magna is 0.445 mg·L-1, and the no observed effect concentration (NOEC) is 0.11 mg·L-1. In addition, the study has also found that the first molting time and the first reproduction time of Daphnia magna were significantly affected by NP40EO 1.78 mg·L-1 in exposure concentration. All the findings demonstrate that NP40EO has some inhibitory effect on growth and reproduction of Daphnia magna.

Key words: nonylphenol ethoxylates, Daphnia magna, acute toxicity, chronic toxicity, breeding

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