NDLI: Assessing the Karst Groundwater Quality and Hydrogeochemical Characteristics of a Prominent Dolomite Aquifer in Guizhou, China

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Assessing the Karst Groundwater Quality and Hydrogeochemical Characteristics of a Prominent Dolomite Aquifer in Guizhou, China

Content Provider	MDPI
Author	Wang, Zhongmei Torres, Martin Paudel, Prakash Hu, Liangbo Yang, Genlan Chu, Xuewei
Copyright Year	2020
Abstract	Karst groundwater is one of the primary water resources in most provinces of Southwestern China where karst topography is strongly featured. In Guizhou Province, a prominent geologic sedimentary formation is the dolomite stratum which exists as the restricted platform facies and potentially provides a large reservoir for drinking water. A proper understanding and evaluation of its hydrogeochemical characteristics and water quality is the key to ensuring the drinking water safety. In the present study, groundwater samples were collected from 25 locations of the dolomite aquifer across Guizhou to determine their major chemical compounds, including the cations ( $K^{+}$ , ${Na}^{+}$ , ${Ca}^{2 +}$ , ${Mg}^{2 +}$ ) and the anions ( ${HCO}_{3}^{-}$ , $F^{-}$ , ${Cl}^{-}$ , ${NO}_{3}^{-}$ , ${SO}_{4}^{2 -}$ ), as well as the pH, total hardness, and total dissolved solids. ${HCO}_{3}^{-}$ and ${Ca}^{2 +}$ were found to be the dominant anion and cation, respectively, which is characteristic of typical karst groundwater and supports the overall observation of a slightly weak acid to weak alkaline environment in the studied groundwater, as the pH measurements ranged from 6.80 to 8.37. Fuzzy comprehensive evaluation method is used to evaluate the groundwater quality based on typical drinking water safety standard. The results show that the groundwater in most of the studied aquifers is of reasonably good quality. However, in some aquifers, concentrations of ${NO}_{3}^{-}$ and/or ${SO}_{4}^{2 -}$ were found to be excessively high. Overall, the studied dolomite aquifer in its natural environment as investigated in the present study can be considered as a potential geological stratum for water resources exploitation in Guizhou.
Starting Page	2584
e-ISSN	20734441
DOI	10.3390/w12092584
Journal	Water
Issue Number	9
Volume Number	12
Language	English
Publisher	MDPI
Publisher Date	2020-09-16
Access Restriction	Open
Subject Keyword	Water Water Science and Technology Karst Groundwater Hydrogeochemical Water Quality Assessment Dolomite Aquifer
Content Type	Text
Resource Type	Article

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