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应用生态学报 ›› 1999, Vol. 10 ›› Issue (4): 485-488.

• 研究论文 • 上一篇    下一篇

EDTA对Cu在水生微宇宙中的毒性和分布的影响

张毅敏1, 金洪钧2   

  1. 1. 国家环保总局南京环境科学研究所, 南京 210042;
    2. 南京大学环境科学与工程系, 南京 210008
  • 收稿日期:1997-06-23 修回日期:1998-10-30 出版日期:1999-07-25 发布日期:1999-07-25
  • 通讯作者: 张毅敏,女,1965年4月生,硕士,助理研究员,主要从事生态毒理学、有害废物风险评价、环境规划及生态污染控制等研究,发表论文4篇.E-mail:ymzhang@163.net,zymzym@hotmail.com E-mail:ymzhang@163.net,zymzym@hotmail.com
  • 基金资助:

    国家自然科学基金资助项目(3860656).

Effect of EDTA on toxicity and distribution of Cu in aquatic microcosm

Zhang Yimin1, Jin Hongjun2   

  1. 1. Nanjing Institute of Environmental Sciences, National Environmental Protection Agency, Nanjing 210042;
    2. Nanjing University, Nanjing 210008
  • Received:1997-06-23 Revised:1998-10-30 Online:1999-07-25 Published:1999-07-25

摘要: 利用实验室人工合成培养微宇宙,研究不同浓度EDTA(0.0、1.0、8.0mg·L-1)对微宇宙中Cu(2.0mg·L-1)的毒性及Cu的分布。结果表明,在微宇宙运行过程中,投加2.0mg·L-1Cu后,EDTA浓度为0.0mg·L-1试验组中大型种群大小、叶绿素a浓度及总初级生产力与总呼吸的比值(P/R)随时间变动曲线,明显低于其它试验组的曲线,EDTA的存在削弱了Cu对大型和藻类的毒性作用,并缓解了Cu对生态系统代谢功能的干扰;同时改变了微宇宙中Cu在不同隔室中的分布,水体中Cu相对增加(0.1%~6.7%),沉积物中相对减少(0.8%~6.5%);EDTA的存在影响了藻类和大型对Cu的积累系数(p<0.05).

关键词: 络合剂EDTA, 微宇宙, Cu, 分布, 毒性, 空间异质性, 土壤化学因子, 滨海盐渍区, 耐盐植物

Abstract: The effect of EDTA at different concentrations (0.0,1.0,8.0mg·L-1) on toxicity and distribution of Cu(2.0mg·L-1) in simulated aquatic microcosm was conducted. The results show that after adding Cu at concentration of 2.0mg·L-1, the time curves of population size, chlorophyll a concentration, and ratio of total primary production to total respiration of Daphnia magna were lower in treatment without EDTAthan in other treatments. The presence of EDTA decreased the toxicity of Cu to Daphnia magna and algae, and alleviated the influence of Cu on metabolic function of ecosystem, but changed the distribution of Cu in different apartments of the microcosm. The amount of Cu increased by 0.1~6.7% in water body, while decreased by 0.8~6.5% in sediment. In addition, the presence of EDTAaffected the Cu bioaccumulation by Daphnia magna and algae.

Key words: EDTA, Microcosm, Copper, Distribution, Toxicity, Daphnia magna, spatial heterogeneity, coastal saline area, salt-tolerant plant, soil chemical factor