NDLI: Isotope hydrochemical approach to understand fluoride release into groundwaters of Ilkal area, Bagalkot District, Karnataka, India

Content Provider	Springer Nature Link
Author	Tirumalesh, K. Shivanna, K. Jalihal, A. A.
Copyright Year	2006
Abstract	Isotope and hydrochemical investigations have been carried out in the Ilkal area of Karnataka, India, in order to determine the source and mechanism of fluoride release into groundwaters and to understand groundwater hydrochemistry. Agriculture, granite quarrying and rock-polishing industries are the main occupations in this area. Closepet granite, Peninsular gneiss and Dharwar schists are the major geological formations. Results show that the fluoride concentration in groundwater is 0.3–6.5 mg/L and it is found to increase from recharge area to discharge area. Fluoride variability is found to be influenced by the geology of the area and depth wise correlation was not observed. Water samples are unsaturated with respect to fluorite, indicating the possibility of further increase in fluoride in groundwater. Positive correlations between fluoride with sodium and bicarbonate in groundwater show that high fluoride content and alkaline sodic characteristics are the result of dissolution of fluoride bearing minerals, possibly derived from weathered granite and gneiss. A positive correlation between fluoride and δ$^{18}$O, and the presence of high tritium in fluoride-contaminated groundwater, point to contribution from surface waters, contaminated by anthropogenic activities. Dumping of rock wastes that are rich in fluoride into the streams by the rock-polishing industries plays a significant role in contaminating groundwater.Des études isotopiques et hydrochimiques ont été réalisées sur la zone d’Ilkal dans le Karnataka en Inde, de manière à déterminer l’origine et le mécanisme de libération du fluor dans les eaux souterraines et à mieux comprendre l’hydrochimie de ces dernières. L’Agriculture, les carrières de granite et l’industrie du polissage de roches sont les principales activités de la zone d’étude. Les principales formations géologiques sont le granite de Closepet, le gneiss de Peninsular et les schistes de Dharwar. Les résultats montrent que la concentration en fluor dans l’eau souterraine varie entre 0.3 et 6.5 mg/L et augmente de l’aire de recharge vers la zone d’exutoire. La variabilité en fluor est influencée par la géologie et aucune corrélation avec la profondeur n’a été trouvée. La saturation en fluorures dans les échantillons n’a pas été atteinte, indiquant la possible augmentation du fluor dans l’eau souterraine. La corrélation positive entre le fluor et le sodium et le bicarbonate montre que les fortes concentrations en fluor et le caractère alcalino-sodique sont les résultats de la dissolution de minéraux contenant du fluor, lesquels dérivent de l’altération du granite et du gneiss. Une corrélation positive entre le fluor et le δ$^{18}$O, et la présence de teneurs élevées en tritium dans les eaux contaminées par le fluor, indique la contribution des eaux surfaces contaminées par les activités anthropogéniques. Le dépôt dans les cours d’eau de déchets rocheux riches en fluor issus de l’industrie du polissage, joue un rôle significatif dans la contamination de l’eau souterraine.Se han realizado investigaciones hidroquímicas e isotópicas en el área Ilkal de Karnataka, India, para determinar la fuente y mecanismo de liberación de fluoruro hacia las aguas subterráneas y para entender la hidroquímica del agua subterránea. Las principales actividades en el área son agricultura, canteras de granito e industrias de pulimento de roca. Las principales formaciones geológicas son los esquistos Dharwar, gneiss Peninsular, y granito Closepet. Los resultados muestran que la concentración de fluoruro en agua subterránea varía de 0.3 a 6.5 mg/l y se ha encontrado que incrementan de la zona de recarga a la zona de descarga. Se ha documentado que la variabilidad de fluoruro depende de la geología del área y no se observó en ningún modo correlación con la profundidad. Las muestras de agua se encuentran no saturadas en relación con fluorita lo que indica la posibilidad de incremento posterior en el contenido de fluoruro en el agua subterránea. Las correlaciones positivas entre fluoruro con sodio y bicarbonato en el agua subterránea muestra que el contenido de fluoruro y las características sodico alcalinas son el resultado de disolución de minerales floríferos, posiblemente derivados del intemperismo de granitos y gneisses. Una correlación positiva entre fluoruro y δ$^{18}$O, y el alto contenido de tritio en agua subterránea contaminada con fluoruro, sugiere contribución de aguas superficiales contaminadas por actividades antropogénicas. La liberación de residuos rocosos ricos en fluoruros en los ríos por parte de las industrias de pulimento de roca juega un papel significativo en la contaminación de las aguas subterráneas.
Starting Page	589
Ending Page	598
Page Count	10
File Format	PDF
ISSN	14312174
Journal	Hydrogeology Journal
Volume Number	15
Issue Number	3
e-ISSN	14350157
Language	English
Publisher	Springer-Verlag
Publisher Date	2006-10-06
Publisher Institution	International Association of Hydrogeologists
Publisher Place	Berlin, Heidelberg
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Fluoride Contamination Hydrochemistry Isotopes Karnataka Waste Water Technology Water Pollution Control Water Management Aquatic Pollution Geology Hydrogeology
Content Type	Text
Resource Type	Article
Subject	Earth and Planetary Sciences Water Science and Technology

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