Intra-annual variability in the heavy metal geochemistry of ground waters from the Deccan basaltic aquifers of India

Geochemical baseline (geogenic+anthropogenic) and background (geogenic) levels of heavy metals in the ground waters from basaltic aquifers of Deccan Volcanic Province of India depicted intra-annual variability on spatial scale. Classified into ‘Group I’ (Fe > Mn > Zn > Pb) and ‘Group II’ (M...

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Bibliographic Details
Published in:Environmental earth sciences 2016-04, Vol.75 (8), p.1-24, Article 654
Main Authors: Pawar, N. J., Pawar, J. B.
Format: Article
Language:English
Subjects:
Accretion
Agricultural land
Agriculture
Alluvial aquifers
Annual variations
Anthropogenic factors
Aquifers
Biogeosciences
Copper
Correlation coefficient
Earth and Environmental Science
Earth Sciences
Environmental Science and Engineering
Geochemistry
Geology
Groundwater
Groundwater pollution
Hazards
Health hazards
Health risks
Heavy metal content
Heavy metals
Hydrology/Water Resources
Land use
Monsoons
Original Article
Terrestrial Pollution
Vadose water
Water table
Water table fluctuations
Wells
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Summary:Geochemical baseline (geogenic+anthropogenic) and background (geogenic) levels of heavy metals in the ground waters from basaltic aquifers of Deccan Volcanic Province of India depicted intra-annual variability on spatial scale. Classified into ‘Group I’ (Fe > Mn > Zn > Pb) and ‘Group II’ (Mo > Ni > Cr > Cu), metals depicted contrasting enrichment and depletion patterns seasonally, attributable to geologic controls and water table fluctuations. While, fortification in Mo–Ni in post-monsoon (high water table) is on account of combined lithogenic+anthropogenic contributions, pre-monsoon augmentation in Fe–Mn (low water table) is entirely lithogenic. Positive values of Normalised Difference Dispersal Index, replicates the dominant role of soil/vadose zone as a chief supplier of metals to the groundwater during post-monsoon, while negative figures recommend host rock as a primary source of accretion of metals in pre-monsoon. Higher Ni/Cr ratios for wells in alluvial aquifer (fertile agriculture plain) than the basaltic and dyke aquifers, further suggest enhanced input of the elements (Mo, Ni > Cu) from soil and agriculture land use in post-monsoon season. Values of Ni/Cr ratio above unity for majority of the wells in post-monsoon and nearly 50 % wells in pre-monsoon suggest privileged weathering of olivine, followed by pyroxene > plagioclase feldspar (Ni/Cr
ISSN:1866-6280
1866-6299
DOI:10.1007/s12665-016-5450-7