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Hydrochemistry and water quality of Rewalsar Lake of Lesser Himalaya, Himachal Pradesh, India

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Abstract

The present research is to study hydrochemistry and water quality of Rewalsar Lake during pre-monsoon, monsoon, and post-monsoon seasons. The Ca2+ and Na+ are observed as the dominant cations from pre- to post-monsoon season. On the other hand, HCO3 and Cl are observed dominant anions during pre-monsoon and monsoon seasons, whereas HCO3 and SO42− during post-monsoon season. The comparison of alkaline earth metals with alkali metals and total cations (Tz+) has specified that the carbonate weathering is the dominant source of major ions in the water of lake.  The HCO3 is noticed to be mainly originated from carbonate/calcareous minerals during monsoon and post-monsoon, but through silicate minerals during pre-monsoon.  The SO42− in Rewalsar Lake is produced by the dissolution of calcite and dolomite etc. The alkali metals and Cl in the lake can be attributed to the silicate weathering as well as halite dissolution and anthropogenic activities. Certain other parameters like NO3, NH4+, F, and Br are mainly a result of anthropogenic activities. The alkaline earth metals are found to surpass over alkali metals, whereas weak acid (HCO3) exceed to strong acid (SO42−). The Piper diagram has shown Ca2+–HCO3 type of water during all the seasons. The water quality index has indicated that the water quality of the lake is unsuitable for drinking from pre- to post-monsoon. Several parameters like salinity index, sodium adsorption ratio, sodium percent, residual sodium carbonate, magnesium hazard etc. have revealed the water of Rewalsar Lake as suitable for irrigation.

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Acknowledgements

The authors thank the Hon’ble Vice Chancellor, Central university of Himachal Pradesh (CUHP) for his encouragement and support in publishing this manuscript. The authors heartily thank the Director, Wadia Institute of Himalayan Geology (WIHG), Dehradun for permitting the first author to work in WIHG lab and allowing this manuscript for publication. The authors highly acknowledge Dr. K.B.S. Krishna, Assistant Professor in the Department of English and European Languages, CUHP, for editing the manuscript. The authors acknowledge the support provided by Shri Bansilal, Sarpanch, Rewalsar village, and besides, the local administration of the lake for providing boat facility, permission, and other help during collection of water samples.

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Correspondence to Pawan Kumar Gaury.

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Gaury, P.K., Meena, N.K. & Mahajan, A.K. Hydrochemistry and water quality of Rewalsar Lake of Lesser Himalaya, Himachal Pradesh, India. Environ Monit Assess 190, 84 (2018). https://doi.org/10.1007/s10661-017-6451-z

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  • DOI: https://doi.org/10.1007/s10661-017-6451-z

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