Environmental Engineering Reference
In-Depth Information
Pre Monsoon
6
Anhydrite
Aragonite
Calcite
Dolomite
Fluorapatite
Goethite
Gypsum
Halite
Magnesite
Sidenite
4
2
0
−
2
−
4
−
6
−
8
−
10
TDS (mg/I)
Post Monsoon
6
Anhydrite
Aragonite
Calcite
Dolomite
Fluorapatite
Goethite
Gypsum
Halite
Magnesite
Sidenite
4
2
0
−
2
−
4
−
6
−
8
−
10
TDS (mg/I)
Fig. 6
Plots of saturation indices (SI) with respect to different minerals against total dissolved
solids for pre-monsoon and post-monsoon
samples show undersaturation and 22 %, 33 % and 22 % samples show supersaturation
with respect to aragonite, calcite and fluorapatite minerals in post-monsoon season,
respectively (Fig.
6
).
Water samples are undersaturated with respect to sulphur-bearing minerals (gyp-
sum and anhydrite) in all groundwater samples both in pre- and post-monsoon; it
suggeststhatdissolutionofthesemineralshavecontributedCa
2+
, Mg
2+
and other
ions into the groundwater. Dissolution of silicate minerals is generally a very slow
processthatdoesnotproducesigniicantvariationsinwaterchemistry(Condesso
de Melo et al.
1999
). Study of saturation indices reveals that all the samples of
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