Spatial analysis of fluoride concentration in groundwaters of Shivani watershed area,Karnataka state,South India,through geospatial information system |
| |
| Authors: | D C Kantharaja T K Lakkundi M Basavanna S Manjappa |
| |
| Institution: | (1) Department of Geology, Karnatak University, Dharwad, Karnataka, India;(2) Department of Analytical Chemistry, Kuvempu University, Davanagere-4, Karnataka, India;(3) Present address: Guyana Geology and Mines Commission, Georgetown, Guyana, South America |
| |
| Abstract: | Hydrogeochemical investigations with emphasis on groundwater fluoride concentrations were carried out in the Shivani watershed
area, Karnataka, South India. This drought-prone watershed is characterised by poor groundwater potential and is composed
of different lithounits like gneisses, migmatites, tonalites, mafics–ultramafics, conglomerates and quartzites. Analysis of
spatial variation of groundwater fluoride concentration through the use of GIS technology software platforms like ArcView
3.2a and MapInfo Professional 8.5 has enabled the identification of low-fluoride and high-fluoride areas within the watershed.
Geochemical data indicates that 38% of groundwater samples have excessive fluoride concentration which poses a health risk
to the population of the area. Correlation studies indicate that higher groundwater alkalinity activates leaching of fluoride
resulting in elevated concentrations of fluoride. No other significant geochemical interrelationship could be identified between
fluoride and rest of the physico-chemical parameters owing to the lack of any significant correlation coefficients. This holds
good in the case of both low-fluoride (<1.5 mg/L) and high-fluoride (>1.5 mg/L) groundwaters of the watershed. However, differential
or non-uniform type (positive or negative) of coefficient of correlation is observed between fluoride at different levels
and other physico-chemical parameters. Among the different lithounits of the study area, gneisses house comparatively more
number of high-fluoride groundwaters. Fluoride-bearing minerals biotite, hornblende and apatite are the probable natural sources
of groundwater fluoride. |
| |
| Keywords: | |
| 本文献已被 SpringerLink 等数据库收录！ |
|
