Fluoride enrichment mechanism and geospatial distribution in the volcanic aquifers of the Middle Awash basin, Northern Main Ethiopian Rift

Furi, Wakgari; Razack, Moumtaz; Abiye, Tamiru; Ayenew, Tenalem; Legesse, Dagnachew

doi:10.1016/j.jafrearsci.2011.03.004

Cited by 43 publications

(12 citation statements)

References 31 publications

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“…A similar observation has been made by Chen et al [56]. Fortunately, carbonate and phosphate ions are absent or very little in most groundwater sources of the Main Ethiopian Rift [3,4]. The results also revealed that the adsorption of fluoride was greatly affected in the presence of the mixture of the anions in the solution in the concentration range of 100 to 500 mg/L, indicating that the effect of PO 4 3-and CO 3 2-ions overshadowed the influence of the presence of the other anions.…”

Section: Effect Of Co-existing Anionssupporting

confidence: 82%

Experimental Evaluation of Activated Termite Mound for Fluoride Adsorption

Fufa¹

2016

IOSR

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Section: Effect Of Co-existing Anionssupporting

confidence: 82%

Experimental Evaluation of Activated Termite Mound for Fluoride Adsorption

Fufa¹

2016

IOSR

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“…Meanwhile, samples with high F − concentrations were Na-HCO 3 water type while samples with low F − concentrations were Ca-Mg-HCO 3 water type. This is because Na-HCO 3 water types are capable of releasing fluoride from fluorite mineral [62,65]. Likewise, cation exchange resulted in high Na + /Ca 2+ in groundwater of the Bilate river basin.…”

Section: Genesis Of High Fluoride Groundwatermentioning

confidence: 99%

Geochemical Evolution of Fluoride and Implication for F− Enrichment in Groundwater: Example from the Bilate River Basin of Southern Main Ethiopian Rift

Haji

Wang

et al. 2018

Water

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Groundwater is the most important source of drinking water. Fluoride was found in high concentrations in the groundwater from deep wells of the water supply in the southern main Ethiopian rift. The high concentration of fluoride is dominantly geogenic rather than anthropogenic in origin, as the agricultural area was not found to be contaminated with NO 3 − . Knowledge of fluoride enrichment will help to provide management plans for developing deep groundwater and minimizing the health risks of exposure to fluoride. The chemical processes of fluoride were investigated in the waters in the Bilate River basin using hydrochemical and isotopic tools. The F − concentration ranged from 0.5 to 1.29 mg/L in water from shallow wells and from 0.48 to 5.61 mg/L in water from deep wells. Seventy percent of deep well samples had F − > 1.5 mg/L higher than the World Health Organization potable guideline. The high fluoride concentration in the groundwater was mainly situated in the rift valley of the Bilate River basin, in contrast with low F − groundwater in the highland. The concentration of fluoride was lowest in Ca-Mg-HCO 3 type groundwater and highest in Na-HCO 3 type groundwater. Moreover, F − was positively correlated with HCO 3 − , Na + , Na + /Ca 2+ and pH in groundwater and Na + /Ca 2+ ratios were increased along the flow path. Hydrogeological, hydrodynamic and hydrochemical conditions are responsible for fluoride accumulation in the deep aquifers. Strong dynamic flow in highland areas flush away weathered chemical components (e.g., F − ). Thus, surficial weathering is not a major controlling factor for high concentrations of Fluoride in deep groundwater but the combination of silicate hydrolysis and ion exchange mainly control fluoride enrichment in stagnant flow environments.In past decades, researchers have studied the geographical distribution of fluoride concentration [6-8] and its relationship with dental caries, dental fluorosis and skeletal fluorosis [9][10][11] in the Ethiopian rift valley. Water quality and fluoride sources were investigated in the central Ethiopian rift [12]. The occurrence of health problems related to fluoride are well documented in the Central Ethiopian rift valley, whereas hydrogeochemistry and F − enrichment mechanism in the southern Ethiopian rift valley have not yet been investigated and are poorly understood.Fluoride in groundwater is related to various rock types, that is, sedimentary rocks [13,14], igneous rock [12,15], or metamorphic rock [16,17], influenced by geochemical and climatological conditions [18]. Volcanic emissions and geothermal water are also sources of fluoride in groundwater [19][20][21]. Fluorine-bearing minerals like topaz, fluorite, tourmaline, muscovite, biotite, hornblende and villianmite, release F − through weathering and water-rock interaction [22][23][24]. Besides natural sources, fluoride can be derived from anthropogenic activity including mining activities, industrial emissions and agricultural fertilizers [25][26][27].The south Ethiopian rift is locate...

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“…The processes occurring within the groundwater and reactions with aquifer minerals have a profound effect on water quality [1]. Knowledge of the geochemical evolution of groundwater in arid and semi-arid regions could lead to sustainable development and effective management of these water resources [2][3][4]. Accordingly, water quality analysis is important for groundwater studies and utilization.…”

Section: Introductionmentioning

confidence: 99%

Groundwater Quality and Suitability for Different Uses in the Saloum Area of Senegal

Ndoye

Fontaine

Gaye

et al. 2018

Water

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Hydrogeochemical analyses were conducted on groundwater sampled from the Saloum aquifer, in southern Senegal. The objective was to identify the chemical processes that control hydrochemistry and to assess the quality of groundwater for determining its suitability for drinking and agricultural purposes. Water samples were collected from 79 wells during the dry season in May 2012, and were subjected to analysis for chemical characteristics (major ions), pH, electrical conductivity (EC) and total dissolved solid (TDS). The dominant hydrochemical facies observed for the groundwater samples are NaCl and CaHCO3. Gibbs plot depicts predominance of rock water interaction and evaporation processes controlling the water chemistry. Percentage of Na+, Residual Sodium Carbonate (RSC), Total Hardness (TH) and Sodium Adsorption Ratio (SAR) values were calculated. The results were compared with the standard guideline values recommended by the World Health Organization and agricultural water standards. The TDS in groundwater is less than 1200 mg/L and SAR values are less than 10. RSC values overall are less than 1.25 meq/L. Results show that the groundwater in the area has generally a low hardness and is fresh (95%) to brackish. The majority of groundwater samples are appropriate for domestic uses. The indexes for water irrigation compared with standard limits revealed that most of the Saloum groundwater samples fall in the suitable range for irrigation.

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Fluoride enrichment mechanism and geospatial distribution in the volcanic aquifers of the Middle Awash basin, Northern Main Ethiopian Rift

Cited by 43 publications

References 31 publications

Experimental Evaluation of Activated Termite Mound for Fluoride Adsorption

Experimental Evaluation of Activated Termite Mound for Fluoride Adsorption

Geochemical Evolution of Fluoride and Implication for F− Enrichment in Groundwater: Example from the Bilate River Basin of Southern Main Ethiopian Rift

Groundwater Quality and Suitability for Different Uses in the Saloum Area of Senegal

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