Volume No. 3 Issue No.: 2 Page No.: 388-394 Oct-Dec 2008

 

PHYTOACCUMULATION OF NICKEL FROM CONTAMINATED WATER BY DUCKWEED (Lemna minor)

 

Leela Kaur*, Kasturi Gadgil1 and Satyawati Sharma2

1. Centre for Energy Studies, Indian Institute of Technology (IIT), New Delhi, (INDIA)
2. Centre for Rural Development and Technology, IIT, New Delhi, (INDIA)

 

Received on : July 19, 2008

 

ABSTRACT

 

Water contamination with heavy metals is a major environmental problem due to nondegradability and harmful effects of toxic metals. Phytoremediation has been drawing attention for many years as it is an environment-friendly, cost-effective and aesthetically pleasing technology. The duckweed, Lemna minor, has been shown to remove toxic elements from water. The objective of this study was to evaluate the removal efficiency of Nickel (Ni) by Lemna minor in contaminated water and to observe the effects of Ni on the growth of the plants. Generally, Ni contamination of water is the result of discharge of industrial effluents emerging from metal producing, mining, electroplating, battery manufacturing, electronic industries, tannery, steel and textile. Ni is a known carcinogen. Experiments were conducted for 14 days. Plants were treated to Ni concentrations ranged from 1-20 mg/L. Ni content was analyzed using atomic absorption spectrophotometer. The results show that Ni removal and the Bioconcentration factor (BCF) of Ni in Lemna minor were highest at initial Ni concentration and decreased as the initial Ni concentration increased. Ni removal by Lemna minor therefore is a suitable option for the treatment of Ni contaminated water.

 

Keywords : Phytoremediation, Lemna minor, Ni-contaminant, Bioconcentration factor.

 

 

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