Mishra, Archana; Tripathi, Brahma Dutt
January 2008
Journal of Environmental Hydrology;2008, Vol. 16, p1
Academic Journal
The purpose of this study is to assess the water quality of the river Ganga at Varanasi using the Trophic Diatom Index (TDI). Samples were taken from June to December 2006 at four sites and analyzed for different physico-chemical characteristics. The difference in water quality was reflected by different diatom communities. Generally, species belonging to genera such as Nitzschia and Navicula were more abundant at the polluted sites. TDIs were significantly correlated with phosphate and nitrate. A negative correlation was found with the Water Quality Index (WQI). Biological properties of periphyton including biomass, chlorophyll-a concentration, and the taxonomic composition assemblages, were also analyzed to characterize the pollution level. The sensitivity of TDI and other parameters supports the use of this index for monitoring the water quality of rivers.


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