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Seasonal Variation of Drinking Water Quality with respect to Fluoride and Nitrate in Dhakuakhana Sub-Division of Lakhimpur District of Assam

Author(s): Jayanta Chutia and Siba Prasad Sarma

The present investigation has been undertaken to determine the seasonal variation of the quality of drinking water of the study area Thirty water samples were analysed during May-June 2008 for pH, total hardness, fluoride and nitrate contents by adopting standard methods (APHA-AWWA-WPCF, 1995) and another thirty water samples were analysed during Nov-Dec. 2008 for the same contents. The data obtained were within the standard, permissible limits of WHO. The variations of the pH values were not vary large but an increase was noticeable during winter and a lowering during the post monsoon period. All the water samples were found either soft or moderately hard. The total hardness values were comparatively higher in the water samples collected during the dry season. Fluoride and nitrate contents were found slightly higher during post-monsoon period.

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