Last-five-decade heavy metal pollution records from the Rewalsar Lake,Himachal Pradesh,India |
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| Authors: | Narendra Kumar Meena M Prakasam Ravi Bhushan Sudipta Sarkar Pranaya Diwate Upasana Banerji |
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| Institution: | 1.Wadia Institute of Himalayan Geology,Dehradun,India;2.Physical Research Laboratory,Navrangpura, Ahmedabad,India;3.Department of Geology,M.S. University of Baroda,Vadodara,India |
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| Abstract: | The lakes of the Himalaya are degrading due to increase in toxic heavy metal loading. This study reports the last 50-year heavy metal pollution loading in the Rewalsar Lake, Himachal Pradesh, India. Sediment cores were recovered to study the pollution loading in the lake sediments. The 137Cs and 210Pb isotope-based sedimentation rate suggest rapid sedimentation in the lake during the last ~50 years. The concentrations of Mn, Cu, Zn, Cd, Pb, Co, Ni, Cr metals in the lake sediments owe its contributions both to the natural and anthropogenic sources. Prior to ca 1990 AD, metal loading was dominated by the lithogenic input, whereas post ca 1990 AD the metal loading was controlled by the anthropogenic factors. The Pb concentration in the lake gradually increased during 1990–2004 and then decreased significantly till present. The higher concentration of Pb seems to be derived from the fossil fuel burning, while the Cr concentration in the lake indicates the use of fertilizer in the catchment area. The lowest concentrations of elements around ca 1990 AD seem to have occurred due to channelization of the lake feeding system. |
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