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2.2.1.2 Groundwater
ОглавлениеThere are several factors affecting the fluoride presence like granite, gneissic rocks, and volcanic as well as mountainous area sediments of marine origin. The above‐mentioned rocks are rich in fluoride and are often found beneath the Earth's surface, ultimately leading to groundwater contamination. Alarming high fluoride ion concentrations together with various other toxic and infectious substances present in the groundwater of South and Southeastern Asia are of utmost concern (Ghosh et al. 2013).
Figure 2.1 Sources of fluoride contamination in the environment.
Table 2.1 Fluoride levels reported in different regions.
Country | Location | Fluoride concentration (mg/L) | References |
---|---|---|---|
India | Hyderabad, Andhra Pradesh | 0.38–4.0 | Sreedevi et al. (2006) |
Ranga Reddy, Andhra Pradesh | 0.4–4.8 | Sujatha (2003) | |
Karbi Anglong, Assam | 0.4–20.6 | Chakraborti et al. (2000) | |
Bihar Shallow | 0.1–2.5 | Ray et al. (2000) | |
Delhi | 0.2–32.5 | Raju et al. (2009) | |
Gujarat | 0.1–40 | Raju et al. (2009) | |
Palghat, Kerala | 0.2–5.75 | Shaji et al. (2007) | |
Chandidongri, Madhya Pradesh | 1.5–4.0 | Chatterjee and Mohabey (1998) | |
Shivpuri, Madhya Pradesh | 0.2–6.4 | Ayoob and Gupta (2006) | |
Orissa | 0.1–10.1 | Kundu et al. (2001) | |
Churu/Dungarpur, Rajasthan | 0.1–14 | Muralidharan et al. (2002); Choubisa (2001) | |
Kancheepuram, Tamil Nadu | 1–3.24 | Dar et al. (2011) | |
Tamil Nadu | 0.5–4.0 | Raju et al. (2009) | |
Cambay, North Gujarat | 0–10 | Gupta et al. (2005) | |
Varanasi, Uttar Pradesh | 0.2–2.1 | Raju et al. (2009) | |
Sonbhadra, Uttar Pradesh | 0.48–6.7 | Raju et al. (2009) | |
Mathura, Uttar Pradesh | 0.6–2.5 | Misra et al. (2006) | |
Canada | Gaspe, Quebec | 0.05–10.9 | Boyle and Chagnon (1995) |
Ghana | Nathenje and Lilongwe | 0.5–7.02 | Msonda et al. (2007) |
Pakistan | Nagar Parkar | 1.13–7.85 | Naseem et al. (2010) |
Sri Lanka | Dry Zone | 0.02–5.30 | Chandrajith et al. (2011) |
Iran | Posht‐e‐Kooh‐e‐Dashtestan | 0.7–6.6 | Battaleb‐Looie and Moore (2010) |
China | Taiyuan Basin | 0.4–2.4 | Li et al. (2011) |
Germany | Muenster Region | 0.01–8.8 | Queste et al. (2001) |
Mexico | Hermosillo city, Sonara | 0–7.59 | Valenzuela‐Vasquez et al. (2006) |