华东师范大学学报(自然科学版) ›› 2016, Vol. 2016 ›› Issue (2): 160-.doi: 10.3969/j.issn.10005641.2016.02.018

• 生态与环境科学 • 上一篇    

氧化还原条件对城市水体沉积物重金属迁移转化的影响

张密1,文波1,黄凌霞1,杜璟2,邓泓1,3,4   

  1. 1.华东师范大学 生态与环境科学学院，上海200241；2.华东师范大学 图书馆，上海200241;3.华东师范大学 上海市城市化生态过程与生态恢复重点实验室，上海200241；4. 华东师范大学 浙江天童森林生态系统国家野外科学观测研究站，上海200241
  • 收稿日期:2015-03-23 出版日期:2016-03-25 发布日期:2016-07-25
  • 通讯作者: 邓泓，女，副教授，研究方向污染生态学，生态修复. E-mail:hdeng@des.ecnu.edu.cn.

Effect of redox condition on metal transformation in urban river sediments

 ZHANG  Mi1, WEN  Bo1, HUANG  Ling-Xia1, DU  Jing2, DENG  Hong1,3,4   

  • Received:2015-03-23 Online:2016-03-25 Published:2016-07-25

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摘要： 以重金属Zn、Fe为研究对象，选取长风公园内的银锄湖和华东师范大学内的丽娃河的沉积物，通过室内模拟水生植物根际泌氧的周期性变化，研究4种不同氧化还原条件：好氧（+O）、厌氧（-O）、好氧后厌氧（+O→-O）和高度厌氧（--O）对沉积物中重金属迁移转化的影响.结果表明，与厌氧处理相比，好氧处理下银锄湖沉积物中可氧化态Fe比例由5.53%下降至4.60%，可还原态Fe比例由13.77%上升至16.20%，残渣态Fe比例由81.08%上升至83.49%，而且Fe向上清液中的释放量减少；弱酸提取态Zn比例由30.14%下降至29.16%，可还原态Zn比例由25.40%下降至23.90%，可氧化态Zn比例由35.73%下降至32.72%，残渣态Zn比例由32.73%上升至35.92%，最终使得上清液中Zn的含量较低.相关性分析结果表明沉积物中可氧化态和可还原态Fe、Zn存在相关性.本研究将对城市富营养化水体生态恢复过程中的风险分析及评价提供科学依据.

关键词: 城市河流, 沉积物, 氧化还原电位, 充气, Fe, Zn, 迁移转化

Abstract: The sediments from Yinchu Lake and Liwa River were studied for the effects of redox changes on Zn and Fe transformation. A simulated experiment was conducted with 4 different redox treatments：aerobic (+O), anaerobic (-O), aerobic then anaerobic (+O→-O) and extensively anaerobic (--O). Compared with anaerobic condition (-O), percentage of oxidizable Fe decreased from 5.53% to 4.60% in the sediment from Yinchu Lake under aerobic condition, while reducible and residual Fe increased from 13.77% to 16.20% and from 81.08% to 83.49%, respectively. Furthermore, the concentration of Fe release in the supernatant was decreased. Percentage of Zn in acid extractable, reducible and FeMn oxides fraction were respectively declined from 30.14% to 29.16%, from 25.40% to 23.90% and from 35.73% to 32.72% in the sediment from Yinchu Lake. However, Zn in residual fraction rose from 32.73% to 35.92% after treated with oxygenenation, which decreased the concentration of Zn release in the supernatant. It indicated that Fe and Zn in FeMn oxides fraction and organic matter fraction had good corrections with each other. Our study would provide scientific basis for risk analysis and evalution on eutrophicated urban river in the process of ecological restoration.

Key words: urban river, sedimen, redox potential, aeration, Fe, Zn, migration and transformation

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