Metal fractionation study on bed sediments of Lake Nainital, Uttaranchal, India
Metal fractionation study on bed sediments of Lake Nainital, Uttaranchal, India
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DOI：
10.1007/s10661-006-9383-6
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发表时间：
2007-07-01
影响因子：
3
通讯作者：
Yadav, Rashmi
中科院分区：
文献类型：
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作者：
Jain, C. K.;Malik, D. S.;Yadav, Rashmi
Nainital湖位于印度北方邦（Uttaranchal）的Nainital镇的中心，通过各种开放的排水沟通过湖泊的集水区接收有毒物质。特别令人感兴趣的有毒物质是来自城市径流以及城市污水和工业废水的重金属。进入湖泊的重金属被吸附在悬浮的沉积物上，这些沉积物又在湖底沉淀下来。本文研究了金属离子在奈尼塔尔湖河床沉积物中的分馏，目的是确定金属离子的生态毒性潜势。沉积物中镍、铅、镉和锌的富集与平均页岩值的比较表明，人类活动对沉积物中镍、铅、镉和锌进行了富集。本研究应用的风险评估代码显示，可交换部分存在4-13%的锰、4-8%的铜、17-24%的镍、3-5%的铬、13-26%的铅、14-23%的镉和2-3%的锌，属于中低风险类别，可能进入食物链。这些金属与可交换组分的结合可能对水生生物造成有害影响。目前的数据库将有助于制定在奈尼塔尔湖进行疏浚作业和/或恢复方案的准则。
Lake Nainital in the heart of Nainital Town in the State of Uttaranchal (India) receives toxic substances through various open drains through the catchment of the lake. The toxic substances of particular interest are heavy metals derived from urban runoff as well as municipal sewage and industrial effluents. Heavy metals entering the lake get adsorbed onto the suspended sediments, which in turn settle down in the bottom of the lake. In this study fractionation of metal ions has been studied on the bed sediments of lake Nainital with the objective to determine the eco-toxic potential of metal ions. Comparison of sediments with average shae values indicated anthropogenic enrichment with nickel, lead, cadmium and zinc. The risk assessment code as applied to the present study reveals that 4-13% of manganese, 4-8% of copper, 17-24% of nickel, 3-5% of chromium, 13-26% of lead, 14-23% of cadmium and 2-3% of zinc exist in exchangeable fraction and therefore comes under low to medium risk category and may enter into food chain. The association of these metals with exchangeable fraction may cause deleterious effects to aquatic life. The present database will help in formulating guidelines for carrying out dredging operations and/or restoration programmes in the Nainital lake.