Techno Press


Advances in Environmental Research   Volume 2, Number 2, June 2013, pages 99-118
DOI: http://dx.doi.org/10.12989/aer.2013.2.2.099
 
Trace elements in the rainwater runoff of the urban catchment of Guwahati, India
Upama Devi and Krishna G. Bhattacharyya

 
Abstract     [Full Text]
    Rainwater runoff has been identified as a significant source of contaminants having tremendous impact on the receiving aquatic environment. In the present study, trace element transport by the surface runoff in the predominantly urban catchment of Guwahati city, India was monitored with a view to determine the chemical denudation rates of the land surface. A number of trace metals, namely Cd, Co, Cr, Cu, Fe, Mn, Ni, Pb and Zn were measured in the runoff after 70 major rain events within the city. Cadmium was found to be the least abundant metal and Iron was the most abundant metal in the runoff. The results are interpreted on the basis of temporal and spatial variations in their concentrations. These variations are quite large in some of the events and reflect changes in the local environmental setting, differences in water utilization, variations in runoff volume, gradient and quality.
 
Key Words
    surface runoff; trace metals; urban catchment; diurnal variation; rain event
 
Address
Upama Devi and Krishna G. Bhattacharyya: Department of Chemistry, Gauhati University, Guwahati 781014, Assam, India
 

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