Please wait a minute...
浙江大学学报（农业与生命科学版）
Journal of Zhejiang University: Agric. & Life Sci.  2010, Vol. 36 Issue (5): 578-584    DOI: 10.3785/j.issn.1008-9209.2010.05.016
Resource & environmental sciences     
Vertical distributions of heavy metals in bottom sediment in Xi-xi national wetland .
CHEN Ru- hai1,ZHAN Liang- tong1,CHEN Yun- min1,HU Hong-zhi2
Download: HTML ( )    PDF(2785KB)
Export: BibTeX | EndNote (RIS)      

Abstract  A special sampler was made to drill out long and integrated sediment samples from Xi-xi national wetland of Zhejiang Province,and the contents of Cu,Pb and Zn in the sediments at different depths were tested to evaluate pollution degree of the heavy metals,as well as to determine their distribution along depth in the wetland using the method of geoaccumulation index . The tests and evaluation results showed that the sediments were moderately polluted within0.6 m below the river bed,and not polluted at the depth deeper than 0.6 m . The concentration of heavy metals in the shallow sediments was found to be higher than that in pore water,which was in turn much more than that in the above water . Heavy metals in pore water of sediments could be released into the above water due to the concentration gradient,indicating that the water quality in the wetland could not be completely recovered only by replacing the polluted water with clean water,but needed to dredge the contaminated sediments in the wetland . The top0.6 m sediment should be dredged from an economic point of view .

Published: 13 September 2010
Service
E-mail this article
Add to my bookshelf
Add to citation manager
E-mail Alert
RSS
Articles by authors
CHEN Ru- hai1
ZHAN Liang- tong1
CHEN Yun- min1
HU Hong-zhi2
Cite this article:

CHEN Ru- hai1,ZHAN Liang- tong1,CHEN Yun- min1,HU Hong-zhi2. Vertical distributions of heavy metals in bottom sediment in Xi-xi national wetland .. Journal of Zhejiang University: Agric. & Life Sci., 2010, 36(5): 578-584.

URL:

http://www.zjujournals.com/agr/10.3785/j.issn.1008-9209.2010.05.016     OR     http://www.zjujournals.com/agr/Y2010/V36/I5/578


西溪湿地底泥重金属竖向分布规律

利用特制的底泥取样器从杭州西溪湿地钻取通长的底泥试样,对不同深度底泥中重金属 Cu、Pb、 Zn进行测试,并分析重金属在表层底泥、底泥孔隙水及上覆水中的含量及相关性,用地累积指数法对底泥 的污染程度进行评价。结果表明:该湿地0.6 m深度内的底泥为轻度-中度污染,埋深大于0.6 m的底泥 没有被污染或者污染程度较轻 ;重金属在表层底泥孔隙水中的含量显著大于其在上覆水中的含量,由于浓度梯度,底泥孔隙水中的重金属会释放到上覆水中,因此如只实施换水处理难以根除水体污染问题,疏浚受污染的底泥是更有效的治理措施。根据测试结果,0.6m深度可作为湿地底泥疏浚的参考依据 。
No related articles found!