Volume No. 8 Issue No.: 3A Page No.: 633-638 Jan-Mar 2014

 

HEAVY METAL EXTRACTION POTENTIALITY OF SOME INDIGENOUS HERBS OF ASSAM, INDIA

 

Sen Bahnika*1 and Baruah P. P.2

1. Department of Environmental Science, Gauhati University, Guwahati, Assam (INDIA)
2. Department of Botany, Gauhati University, Guwahati, Assam (INDIA)

 

Received on : September 20, 2013

 

ABSTRACT

 

Heavy metals are one of the most hazardous contaminants and pose serious threats to biodiversity and human health. Waste discharge from the Jagiroad Paper Mill of Assam (India) increases the heavy metal levels in the soil in its vicinity. Five indigenous plant species viz. Centella asiatica, Oxalis corniculata, Mikania mycrantha, Rumex nepalensis and Ageratum conizoides growing in the contaminated site were screened for the heavy metal accumulation. Accumulative factors like transfer factor and contamination factor were calculated for the metals in both plants and soils and used as basis for interpreting the state of the environment. Of the selected plant species, Ageratum conizoides exhibited high levels of metal accumulation and can be used as an effective phytoremediation tool to detoxify the heavy metal contaminated soil around the paper mill.

 

Keywords : Heavy metals, Paper mill, Ageratum conizoides, Metal accumulation, phytoremediation

 

 

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