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Influence of anthropogenic contamination on groundwater chemistry in Mulbagal town, Kolar District, India

Rao, Sudhakar M., Asha, K. and Sadasivam, Siva 2013. Influence of anthropogenic contamination on groundwater chemistry in Mulbagal town, Kolar District, India. Geosciences Journal 17 (1) , pp. 97-106. 10.1007/s12303-013-0007-1

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Abstract

Geochemical studies are performed to examine the impact of leachate infiltration from on-site sewage disposal systems on the groundwater chemistry in Mulbagal town, Kolar District, Karnataka State, India. The leachate infiltration imposed nitrate concentrations ranging from 4 mg/L to 388 mg/L in the groundwater samples; it was observed that 79% of the samples exhibited nitrate concentrations in excess of drinking water permissible limit (45 mg/L). The average (of 43 measurements) E. coli levels in the groundwater samples corresponded to 189 MPN/100 mL and 55% of the samples tested exhibit pathogen contamination. Results also showed that the groundwater in the study area is characterized by acidic pH, large calcium + magnesium ion and Na/Cl ratios of <unity causing majority of the ground water samples to classify as Ca-Mg-Cl type and Na-Cl type. Saturation index (SI) computation using Visual MINTEQ program showed that the groundwater samples are under-saturated with respect to calcite. The theoretical SI values (of calcite) however suggested that the groundwater samples ought to be over-saturated with calcite. Under-saturation of the groundwater samples with calcite is attributed to increased dissolution of the mineral in the acidic environment of the groundwater.

Item Type: Article
Date Type: Publication
Status: Published
Schools: Engineering
Subjects: Q Science > QD Chemistry
Q Science > QE Geology
Uncontrolled Keywords: anthropogenic; chemistry; contamination; groundwater; sewage;
Publisher: Springer
ISSN: 1226-4806
Last Modified: 04 Jun 2017 04:57
URI: http://orca.cf.ac.uk/id/eprint/46735

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