Groundwater quality and its implications for domestic and agricultural water supplies in a semi-arid river basin of Niger

In the River Goulbi Maradi Basin (RGMB), groundwater is a vital source of drinking water and plays a central role in the region’s socio-economic development. The quality and suitability of groundwater for irrigation and drinking-water remain inadequately understood. We examine hydrochemical analyses...

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Veröffentlicht in:Environmental earth sciences 2023-07, Vol.82 (13), p.329-329, Article 329
Hauptverfasser: Issoufou Ousmane, Boukari, Nazoumou, Yahaya, Favreau, Guillaume, Abdou Babaye, Maman Sani, Abdou Mahaman, Rabilou, Boucher, Marie, Sorensen, James P. R., MacDonald, Alan M., Taylor, Richard Graham
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container_issue 13
container_start_page 329
container_title Environmental earth sciences
container_volume 82
creator Issoufou Ousmane, Boukari
Nazoumou, Yahaya
Favreau, Guillaume
Abdou Babaye, Maman Sani
Abdou Mahaman, Rabilou
Boucher, Marie
Sorensen, James P. R.
MacDonald, Alan M.
Taylor, Richard Graham
description In the River Goulbi Maradi Basin (RGMB), groundwater is a vital source of drinking water and plays a central role in the region’s socio-economic development. The quality and suitability of groundwater for irrigation and drinking-water remain inadequately understood. We examine hydrochemical analyses of 35 groundwater samples from the shallow alluvial (17) and underlying Continental Hamadien (CH) sandstone (18) aquifers and evaluate these against standard measures of their suitability for drinking water (World Health Organization (WHO) guideline values) and irrigation (i.e., sodium adsorption ratio, sodium percentage, and the residual sodium carbonate). Hydrochemical facies are principally of Na–HCO 3 and Na–Cl types. Bivariate plots combined with saturation indices and electrical conductivity monitoring suggest that the main hydrogeochemical processes influencing groundwater quality are cation exchange in the CH aquifer and solute leaching from soils during focused recharge in the alluvial aquifer. 76% (13/17) of groundwater samples from the alluvial aquifer were suitable for irrigation compared to 38% (6/16) of the samples from the CH. The identification of high fluoride concentrations exceeding the WHO drinking-water guideline value (> 1.5 mg/L) in 33% (6/18) of samples from the CH aquifer and 18% (3/17) in the alluvial aquifer, and their respective attribution to the release of fluoride of geogenic origin through cation exchange and local use of fluorapatite fertilisers, provide valuable insight into efforts to address the on-going challenge of fluorosis in the Maradi region of Niger and more widely across African drylands. The health consequences of the widespread observation of Mn in concentrations exceeding the new WHO guideline value (0.08 mg/L) in the alluvial aquifer (6/9 samples), often alongside elevated Fe concentrations, are unclear.
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The identification of high fluoride concentrations exceeding the WHO drinking-water guideline value (&gt; 1.5 mg/L) in 33% (6/18) of samples from the CH aquifer and 18% (3/17) in the alluvial aquifer, and their respective attribution to the release of fluoride of geogenic origin through cation exchange and local use of fluorapatite fertilisers, provide valuable insight into efforts to address the on-going challenge of fluorosis in the Maradi region of Niger and more widely across African drylands. The health consequences of the widespread observation of Mn in concentrations exceeding the new WHO guideline value (0.08 mg/L) in the alluvial aquifer (6/9 samples), often alongside elevated Fe concentrations, are unclear.</abstract><cop>Berlin/Heidelberg</cop><pub>Springer Berlin Heidelberg</pub><doi>10.1007/s12665-023-11016-9</doi><tpages>1</tpages></addata></record>
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subjects alluvial aquifer
Alluvial aquifers
apatite
Aquifers
Arid lands
Arid zones
basins
Biogeosciences
Bivariate analysis
Carbonates
Cation exchange
Cation exchanging
Cations
Drinking water
Earth and Environmental Science
Earth Sciences
Economic development
Electrical conductivity
Electrical resistivity
Environmental Science and Engineering
Fluorapatite
Fluorides
Fluorosis
Geochemistry
Geology
Groundwater
Groundwater irrigation
Groundwater quality
guidelines
Hydrochemicals
Hydrogeochemistry
Hydrology/Water Resources
Irrigation
Irrigation water
Leaching
Manganese
Niger
Original Article
River basins
Rivers
Sandstone
Saturation
Saturation index
Sedimentary facies
Sedimentary rocks
Socioeconomic aspects
socioeconomic development
Sodium
sodium adsorption ratio
Sodium carbonate
Solutes
Terrestrial Pollution
Water analysis
Water quality
Water sampling
Water supply
watersheds
World Health Organization
title Groundwater quality and its implications for domestic and agricultural water supplies in a semi-arid river basin of Niger
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