Nitrate pollution in groundwater: its causes and effects in central part of Suvarnamukhi River Basin, Karnataka


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Radhika, K.N. and Rao Narahari, K.L. and Krishnamurthy, J. and Neelakantarama, J.M. (2011) Nitrate pollution in groundwater: its causes and effects in central part of Suvarnamukhi River Basin, Karnataka. Journal of Applied Geochemistry, 13 (1). pp. 70-84. ISSN 0972-1967

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Groundwater is the major source of drinking water in the sub-​basins of the central part of Suvarnamukhi River Basin. Chem. anal. is carried out for 55 groundwater samples collected during pre-​monsoon and post-​monsoon seasons from five sub-​basins. The av. nitrate concn. is 65.96 and 97.17 ppm in pre-​monsoon and post-​monsoon seasons resp. According to Bureau of Indian Stds. (BIS)​, the max. desirable and permissible limit of nitrate is 45 ppm. In the study area, 25 samples (45​%) and 32 samples (58​%) in pre-​monsoon and post-​monsoon seasons are not suitable for drinking purpose with a seasonal variation of 43​%. Seven samples of post monsoon have increased NO3-​ concn. compared to pre-​monsoon season. The interrelationship of nitrate with other cations and anions suggest the most possible sources of nitrate as non-​point sources (leaching mechanism of nitrate due to extensive use of fertilizers) and to some extent point sources (cattle sheds and poultry farms, leakages from septic tanks, sewerage effluents)​. The nitrate distribution map shows anomalous zones in the central and south eastern part of the study area in both pre and post-​monsoon seasons suggesting that groundwater here is completely polluted and is unfit for drinking. The north western portion of the study area has high NO3-​ concn. during post monsoon season suggesting that the water is polluted due to application of nitrate rich fertilizers.

Item Type: Article
Uncontrolled Keywords: Nitrate concentration, Point sources and non point sources, Anomalous zones, Groundwater, Fertilizers, Suvarnamukhi
Subjects: Faculty of Science > Earth Sciences > Geology
Divisions: Jnana Bharathi / Central College Campus > Department of Geology
Depositing User: Ms. Rekha Jadhav
Date Deposited: 01 Sep 2016 06:07
Last Modified: 01 Sep 2016 06:07

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