Hydrochemical characteristics and identification of groundwater pollution sources in tropical savanna

Groundwater pollution of the watershed is mainly influenced by the multifaceted interactions of natural and anthropogenic processes. In this study, classic chemical and multivariate statistical methods were utilized to assess the groundwater quality and ascertain the potential contamination sources...

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Veröffentlicht in:Environmental science and pollution research international 2022-05, Vol.29 (25), p.37384-37398
Hauptverfasser: Abdulsalam, Abduljalal, Ramli, Mohammad Firuz, Jamil, Nor Rohaizah, Ashaari, Zulfa Hanan, Umar, Da’u Abba
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container_issue 25
container_start_page 37384
container_title Environmental science and pollution research international
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creator Abdulsalam, Abduljalal
Ramli, Mohammad Firuz
Jamil, Nor Rohaizah
Ashaari, Zulfa Hanan
Umar, Da’u Abba
description Groundwater pollution of the watershed is mainly influenced by the multifaceted interactions of natural and anthropogenic processes. In this study, classic chemical and multivariate statistical methods were utilized to assess the groundwater quality and ascertain the potential contamination sources affecting the groundwater quality of Galma sub-watershed in a tropical savanna. For this purpose, the data set of 18 groundwater quality variables covering 57 different sampling boreholes (BH) was used. The groundwater samples essentially contained the cations in the following order of dominance: Ca 2+  > Na +  > Mg 2+  > K + . However, the anions had HCO 3 –  > Cl –  > SO 4 –2  > NO 3 – respectively. The hydrochemical facies classified the groundwater types of the sub-watershed into mixed Ca–Mg–Cl type of water, which means no cations and anions exceeds 50%. The second dominant water type was Ca–Cl. The Mg–HCO 3 water type was found in BH 9, and Na–Cl water type in BH 29 of the studied area. The weathering of the basement rocks was responsible for the concentrations of these ions in the groundwater chemistry of the sub-watershed. Hierarchical cluster analysis (HCA) grouped the groundwater samples (boreholes) into five clusters that are statistically significant regarding the similarities of groundwater quality characteristics. The principal component analysis (PCA) extracted two major principal components explained around 65% of the variance and suggested the natural and anthropogenic processes especially the agricultural pollutants including synthetic fertilizers, and leaching of agricultural waste as the main factors affecting the groundwater quality. The integrated method proved to be efficient and robust for groundwater quality evaluation, as it guaranteed the precise assessment of groundwater chemistry in the sub-watershed of the tropical savanna. The findings of this investigation could be useful to the policy makers for developing effective groundwater management plans for the groundwater resources and protection of the sub-watershed.
doi_str_mv 10.1007/s11356-022-18552-0
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subjects Agricultural pollution
Agricultural wastes
Agrochemicals
Anions
Anions - analysis
Anthropogenic factors
Aquatic Pollution
Atmospheric Protection/Air Quality Control/Air Pollution
Boreholes
calcium
Calcium ions
Cations
Cluster analysis
Contamination
data collection
Earth and Environmental Science
Ecotoxicology
Environment
Environmental Chemistry
Environmental Health
Environmental Monitoring
Environmental science
Fertilizers
Grassland
Groundwater
Groundwater chemistry
groundwater contamination
Groundwater data
Groundwater management
Groundwater pollution
Groundwater quality
Human influences
hydrochemistry
Ions - analysis
issues and policy
Leaching
Magnesium
Pollutants
Pollution sources
principal component analysis
Principal components analysis
Quality assessment
Research Article
Savannahs
savannas
Sodium
Statistical analysis
Statistical methods
subwatersheds
variance
Waste Water Technology
Water - analysis
Water Management
Water Pollutants, Chemical - analysis
Water Pollution Control
Water Quality
Water resources
Water sampling
Watersheds
title Hydrochemical characteristics and identification of groundwater pollution sources in tropical savanna
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