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Groundwater Chemistry In Groundwater Pollution

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Introduction The groundwater chemistry is controlled by rock-water interaction, dissolution of mineral species and anthropogenic activities (Faure, 1998; Subba Rao,2001; Umar and Absar 2003). The potability of water is also affected by over-exploitation of groundwater which ultimately gives rise to severe problem. Anthropogenic influences like domestic sewages, industrial effluents and chemical fertilizers also deteriorate groundwater quality (Vasanthavigar et al. 2012). Variations in water quality and its suitability for domestic and irrigation purposes have also been examined by Alam (2013); Kumar et al (2009); Jalali (2007) and Umar et al (2007).
Fluoride, an essential component for human health, is obtained mostly by drinking water but it becomes toxic when its concentration exceeds the permissible limit (Handa 1975; USPHS 1987; WHO 1984). A concentration of fluoride less than 0.6 mg/l may results in dental carries, while greater than 1.2 mg/l results in fluorosis (ISI 1983). Problem of excessive fluoride in groundwater was first highlighted by Short et al. (1937) in Nellore district of Andhra Pradesh and today more than 65 million people, including 6 million children, are affected by endemic fluorosis in 20 states of India as a result of consuming high fluoride water (Gupta et al. 2006) and Uttar Pradesh is one of those states (Jha et al. 2010).
High groundwater fluoride concentration in Uttar Pradesh, particularly Unnao district, and incidences of fluorosis as a

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