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Assessment of nitrate contamination due to groundwater pollution in north eastern part of Anantapur District, A.P. India

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The north eastern part of Anantapur district is in the state of Andhra Pradesh, India, is significant as it is covered by varied geological formations and has different land use and irrigation practices. Though ground water is the major drinking water source, deterioration in its quality is going unchecked. In such agro-economy based rural areas, the nitrate contamination is rampant and much attention has not been drawn towards this anthropogenic pollution. In the study area ground water samples from different hydrogeological set-up have been collected during the pre and post monsoon seasons and analysed for the major ions such as Ca, Mg, Na, K, CO3, HCO3, Cl, SO4, NO3 and F. The study revealed that 65% of the samples were found to be unsuitable for drinking purposes in the pre monsoon season and 45% in the post monsoon due to excess nitrate (>45 mg/l) content in the ground water. Among the different seasons and environs, nitrate was in highest concentration in the granitic terrain and canal command areas during pre monsoon season. The nitrate was found to decrease with depth in all the hydrogeological set-ups in both the seasons. Intense agriculture practices, improper sewerage and organic waste disposal methods were observed to contribute nitrate to the shallow and moderately deep aquifers.

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Correspondence to A. G. S. Reddy.

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Reddy, A.G.S., Niranjan Kumar, K., Subba Rao, D. et al. Assessment of nitrate contamination due to groundwater pollution in north eastern part of Anantapur District, A.P. India. Environ Monit Assess 148, 463–476 (2009).

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