Investigation of the hydrogeochemical processes in an alluvial channel aquifer located in a typical Karoo Basin of Southern Africa

Gomo, M.; Tonder, G. J. Van; Steyl, Gideon

doi:10.1007/s12665-012-2118-9

Cited by 14 publications

(4 citation statements)

References 17 publications

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“…It was reported that the different hydro geochemical processes can result in groundwater of the same site at different depth (Gomo et al 2013). The main task of a hydro geochemical study is to identify the process responsible for the evolution of measured groundwater chemistry.…”

Section: Introductionmentioning

confidence: 99%

Evaluation of the fate of arsenic-contaminated groundwater at different aquifers of Thar coalfield Pakistan

Ali

Kazi

Baig

et al. 2015

Environ Sci Pollut Res

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In present study, the ground water at different aquifers was evaluated for physicochemical parameters, iron, total arsenic, total inorganic arsenic and arsenic species (arsenite and arsenate). The samples of groundwater were collected at different depths, first aquifer (AQ1) 50-60 m, second aquifer (AQ2) 100-120 m, and third aquifer (AQ3) 200-250 m of Thar coalfield, Pakistan. Total inorganic arsenic was determined by solid phase extraction using titanium dioxide as an adsorbent. The arsenite was determined by cloud point extraction using ammonium pyrrolidinedithiocarbamate as a chelating reagent, and resulted complex was extracted by Triton X-114. The resulted data of groundwater were reported in terms of basic statistical parameters, principal component, and cluster analysis. The resulted data indicated that physicochemical parameters of groundwater of different aquifers were exceeded the World Health Organization provisional guideline for drinking water except pH and SO4(2-). The positive correlation was observed between arsenic species and physicochemical parameters of groundwater except F(-) and K(+), which might be caused by geochemical minerals. Results of cluster analysis indicated that groundwater samples of AQ1 was highly contaminated with arsenic species as compared to AQ2 and AQ3 (p > 0.05).

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Section: Introductionmentioning

confidence: 99%

Evaluation of the fate of arsenic-contaminated groundwater at different aquifers of Thar coalfield Pakistan

Ali

Kazi

Baig

et al. 2015

Environ Sci Pollut Res

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“…NO 3 in water resources can originate from various sources, including atmospheric deposition, chemical and organic fertilizers, industrial waste effluent, and improperly maintained septic systems [53]. Natural NO 3 levels in groundwater are generally very low (<10 mg/L NO 3 ), but these levels can increase in association with anthropogenic inputs.…”

Section: Nitrate Contamination Of Water Resourcesmentioning

confidence: 99%

“…Groundwater NO 3 sources were delineated based on the hydrochemistry of the water samples. Figure 9a presents the Na versus Cl concentrations of the water samples, where a slope of 1:1 indicates that Na and Cl originate from meteoric sources [53]. Most surface water samples and Groups 1 and 2 groundwater samples were plotted below the 1:1 slope line, indicative of excess Na ions from the geological matrix.…”

Section: Nitrate Contamination Of Water Resourcesmentioning

confidence: 99%

Water Resources Sustainability of Ulaanbaatar City, Mongolia

Batsaikhan

Lee

Nemer

et al. 2018

Water

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Ulaanbaatar (UB), the capital of Mongolia, is one of the fastest-growing cities in the developing world. Due to increasing demand driven by rapid population and industrial growth, sustainable water resource management is required. Therefore, we investigated sustainability in UB from the perspective of water quality. During five sampling campaigns, we collected 135 water samples (58 from bedrock wells, 44 from shallow wells tapped into the alluvial aquifer, 24 from rivers, and 9 from springs). The hydrochemistry of the water samples was controlled by two major processes: NO 3 contamination, and silicate and carbonate mineral weathering. The groundwater samples could be classified into three groups based on their NO 3 levels and spatial distribution. Group 1 had natural background NO 3 levels (median: 1.7 mg/L) and silicate weathering-dominant water-rock interactions and was distributed in the alluvial aquifer along the floodplain. Group 2 was dominated by carbonate weathering processes, had a maximum NO 3 concentration of 47.4 mg/L, and was distributed between the riverbank and upslope area; overall, it reflected ongoing contamination. Group 3 was distributed in the upslope Ger districts and showed significant NO 3 contamination (range: 64.0-305.4 mg/L) due to dense and poor living conditions. The stable isotope signatures indicated that the city's major water supply from riverbank filtration (i.e., Group 1 wells) mixed dynamically with the river; therefore, it showed no sign of NO 3 contamination. However, the isotope values and bedrock groundwater quality of wells in Groups 2 and 3 implied that they were closely connected, with the same water source, and showed a strong potential for expanding NO 3 contamination toward Group 1 wells. To support sustainable development in UB, the implementation of appropriate institutional measures to protect and preserve water resources, with systematic spatio-temporal monitoring and a focus on Ger districts, is crucial.

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“…The geogenic mode of groundwater pollution arises from the dissolved concentrations of ions from the minerals present in the host rock constituting the aquifer system, low resident time, flow paths and flow rates [11,26,29]. Several hydrogeochemical processes that have affected groundwater quality status include silicate weathering, ion-exchange processes, evaporation, precipitation, calcite and dolomite mineral dissolution [30][31][32]. This mode of water contamination is rare and not frequent.…”

Section: Introductionmentioning

confidence: 99%

Groundwater quality assessment and characterization of shallow basement aquifers in parts of ado ekiti metropolis, Southwestern Nigeria

2019

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Groundwater samples were collected randomly from hand-dug wells in parts of Ado Ekiti metropolis and were subjected to its quality assessment and characterization. Physicochemical and bacteriological analyses were carried out following standard methods (APHA 2012). Hydrochemistry of the present study revealed relative mean concentration of the cations in the order: Na + > Mg 2+ > Ca 2+ > K + , and that of the anions as Cl − > HCO 3 − > SO 4 2− > NO 3 − , respectively. The microbial test shows that E. coli tested positive in all the samples and their colonies are classified dominantly as satisfactory pollutant free state. Pollution index of groundwater results revealed an insignificant state of pollution of the groundwater. Deduction from the Pipers, Gibbs plots and chloro-alkaline indices results revealed the imprints of natural weathering, ion-exchange processes and anthropogenic activities influencing the groundwater quality. Factor analysis result also confirms the prevailing activities of natural geological forces and municipal contaminations acting on the groundwater. The hydrochemical processes coupled with the permeable nature of the aquifer media and high precipitation will influence groundwater flow and ultimately pose pollution risk to the aquifers and eventually the populace of these areas in years to come.

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Investigation of the hydrogeochemical processes in an alluvial channel aquifer located in a typical Karoo Basin of Southern Africa

Cited by 14 publications

References 17 publications

Evaluation of the fate of arsenic-contaminated groundwater at different aquifers of Thar coalfield Pakistan

Evaluation of the fate of arsenic-contaminated groundwater at different aquifers of Thar coalfield Pakistan

Water Resources Sustainability of Ulaanbaatar City, Mongolia

Groundwater quality assessment and characterization of shallow basement aquifers in parts of ado ekiti metropolis, Southwestern Nigeria

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