Abstract：In order to investigate if effluent from municipal sewage treatment plants (STPs) cause oxidative stress in marine organisms, Meretrix meretrix were exposed to effluent from the Licunhe STP in Qingdao City at various concentrations (0%, 1%, 5%, 10% and 20% V/V), diluted in seawater, for 15days. Antioxidant enzymes analyzed in the viscera of mussels were superoxide dismutase (SOD), catalase (CAT), glutathione peroxidase (GPx) and glutathione reductase (GR). Results showed that the variation trend of SOD activities with exposure time exhibited a parabolic curve shape with a maximal increment of 15.88%, which was induced from day 6 to day 12 in both exposure groups (10% and 20% effluent). Both CAT and GPx were inhibited by the effluent with the highest inhibition 64.38% and 52.39%, at the day 9 and day 12, respectively. At higher effluent concentration (20%), GR activity was inhibited constantly during the exposure period. However, GR activities responded in a parabolic curve shape in other exposure groups where an initial increase was observed at day 3 or day 6 followed by a significant decrease after day 9, and the highest increment were 81.47% and 80.91%, at day 3 and day 6, respectively. Current experimental results suggest that STPs do not have the capacity to biodegrade harmful chemicals sufficiently to prevent toxic action of effluent, and SOD, CAT, GPx and GR activities in viscera of M. meretrix are sensitive indicators of oxidative stress induced by effluent.
苏恩萍, 孟范平, 孙婷, 付文超, 王群, 李永富, 胡恒. 短期暴露于城市污水处理厂尾水的文蛤抗氧化酶响应[J]. 中国环境科学, 2014, 34(2): 511-517.
SU 恩Ping, MENG Fan-Ping, SUN Ting, FU Wen-Chao, WANG Qun, LI Yong-Fu, HU Heng. Responses of the antioxidant enzymes in Meretrix meretrix exposed to effluent from municipal sewage treatment plants for short-term. CHINA ENVIRONMENTAL SCIENCECE, 2014, 34(2): 511-517.
