A1 Journal article (refereed), original research

Major ion chemistry of the Teesta River in Sikkim Himalaya, India:Chemical weathering and assessment of water quality


Open Access publication

Publication Details
Authors: Tsering Tenzin, AbdelWahed Mahmoud S.M., Iftekhar Sidra, Sillanpää Mika
Publisher: Elsevier: Creative Commons Licenses / Elsevier
Publication year: 2019
Language: English
Related Journal or Series Information: Journal of Hydrology : Regional Studies
Volume number: 24
ISSN: 2214-5818
eISSN: 2214-5818
JUFO-Level of this publication: 1
Open Access: Open Access publication

Abstract
Study Region

Teesta River of Eastern Himalayas, India.

Study Focus

This article addresses the mechanisms of weathering in the Teesta River, for the first time based on the original data of major ions. Water samples were collected along the Teesta River in Sikkim Himalaya, India. The evaluation of the major ion and trace elements against the standard guideline values and the average chemical composition of world rivers were discussed.

New Hydrological Insights

The predominance of Ca, Mg and HCO3 in all waters reflects the influence of carbonate weathering on the Teesta River. However, an increase in the Na/Ca ratio was linked to the increase of Si downstream, indicating that silicate weathering was predominant in the lowlands of Teesta drainage. The rate of silicate weathering is dependent on an overall balance of key factors including gradient, contact time, temperature and vegetation. The higher concentration of cations was balanced by the SO4 originating from the action of H2SO4 and H2CO3 on carbonates and silicates. Rock weathering (carbonate-silicate weathering) is the key mechanism that controls the major ion chemistry of the Teesta River followed by evaporite dissolution.


LUT Focus Areas

Last updated on 2020-20-03 at 10:03