Hydrogeochemical evaluation of groundwater in the lower Offin basin, Ghana

Kortatsi, Benony K.; Tay, Collins K.; Anornu, Geophrey K.; Hayford, Ebenezer; Dartey, Grace A.

doi:10.1007/s00254-007-0772-0

Cited by 68 publications

(31 citation statements)

References 15 publications

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“…Smedley et al (2007) noticed that arsenic-bearing sulphide minerals are also sources of arsenic release in groundwater in zones of mineralized Birimian volcano-sedimentary rocks. The same remark has been done by Kortatsi et al (2008b). According to them, pyrite and arsenopyrite oxidation is the plausible process for arsenic mobilization.…”

Section: Natural Sourcesmentioning

confidence: 50%

Arsenic in African Waters: A Review

Ahoulé

Lalanne

Mendret

et al. 2015

Water Air Soil Pollut

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The review of studies on arsenic in African waters shows that arsenic can be found in high concentrations in both surface water and groundwater. Arsenic concentrations in African groundwater range between 0.02 and 1760 μg L −1 , whilst the level of arsenic in surface water is ranged up to 10,000 μg L −1 . This high level of arsenic in surface water is related to mining operations, agricultural drains, local sediments, disposal, and incineration of municipal and industrial wastes. However, mining activities remain the main source of surface water pollution. They have thereby a strong impact on the concentration of arsenic in the environment. As for groundwater, high levels of arsenic occur in natural conditions. It is due to the presence of iron oxides; sulphide minerals such as pyrite, arsenopyrite, and chalcopyrite; volcanic rocks; and geothermal waters. Few studies in Africa make the link between human health problems and high levels of arsenic in water. Only two articles were found dealing with arsenic remediation. This shows that arsenic, which constitutes a major public health issue in the world, has less interest in Africa although high concentrations of arsenic have been found in both surface water and groundwater in some African countries. Most of the studies carried out on arsenic issues in Africa are dedicated to the characterization and the quantification of the pollution, but studies on the risk to human health and treatment systems are limited. The arsenic issue in Africa needs special attention in order to avoid the problems experienced in some areas mainly in Asia.

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Section: Natural Sourcesmentioning

confidence: 50%

Arsenic in African Waters: A Review

Ahoulé

Lalanne

Mendret

et al. 2015

Water Air Soil Pollut

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“…La source du fer et du manganèse serait liée à la décomposition des minéraux ferromagnésiens tels que la biotite et l'amphibole (Kouassi et al, 2010 Une autre source du fer dans les eaux souterraines pourrait être le lessivage des silicates ferromagnésiens (biotite et pyroxènes). De même, il est fort probable que le fer provienne de la dissolution des roches migmatiques souvent associée à l'hématite en présence de matières organiques (Kortatsi, 2007 ;Kortatsi et al, 2008). Les fortes teneurs en fer et en manganèse des eaux souterraines de la région proviendraient essentiellement des terrains géologiques.…”

Section: Discussionunclassified

Caractérisation hydrogéochimique des eaux des aquifères fissurés de la zone Guiglo-Duekoué (Ouest de la Côte d’Ivoire)

Ahoussi¹,

Koffi²,

Ake³

et al. 2012

Int. J. Bio. Chem. Sci

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RESUMELa zone d'étude, Guiglo-Duekoué, est située à l'Ouest de la Côte d'Ivoire, entre les latitudes 7°00' et 7°42' Nord et les longitudes 6°28' et 6°50' Ouest. Cette étude vise à faire une analyse hydrogéochimique les eaux souterraines de la région de Guiglo-Duekoué. L'approche méthodologique est basée sur la détermination des hydrofaciès à partir des diagrammes de Piper et de Schoeller-Berkaloff et l'étude de la qualité des eaux qui s'est appuyée sur une analyse comparative des teneurs des paramètres physico-chimiques aux normes OMS. Les résultats de l'étude ont montré que les eaux sont bicarbonatées calciques et magnésiennes (95,83%) et bicarbonatées sodi-potassiques (4,17%). Ces eaux ont des températures qui varient entre 25,7 °C et 28,9 °C, avec une moyenne de 26,7 °C. Leurs pH oscillent entre 6,51 et 7,13, avec une moyenne de 6,67. La turbidité des eaux souterraines reste très faible avec des valeurs qui varient entre 0,20 NTU et 1,01 NTU, pour une moyenne de 0,49 NTU. La conductivité électrique des eaux varie entre 106 µS/cm et 349 µS/cm, avec une moyenne de 208,437 µS/cm. La majorité des échantillons d'eau a une conductivité électrique comprise entre 100 µs/cm et 250 µs/cm (68,75%). La dureté des eaux est comprise entre 2,8 °F et 15,40 °F, avec une moyenne de 6,41 °F. La qualité physico-chimique des eaux souterraines étudiées est conforme dans l'ensemble aux normes recommandées par l'OMS et ne présentent pas de danger majeur pour la consommation humaine. Cependant, il existe de fortes teneurs en fer (0,66 mg/L) et en manganèse (0,16 mg/L), ce qui explique l'apparence rougeâtre et le goût désagréable de ces eaux.

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“…To correlate concentrations of Na + and divalent cations, the concentrations of Ca 2+ and Mg 2+ were justified by subtracting anion concentrations (HCO À 3 and SO 2À 4 ) associated with weathering processes for carbonate and silicate minerals (Mukherjee et al, 2009). The Na + concentrations were corrected by subtracting the balanced concentration of Cl À (Kortatsi et al, 2008;Mukherjee et al, 2009). The regression slope of normalized Na versus divalent cations was À0.9 (close to À1) in the Datong Ba- sin and Hetao Basin (Fig.…”

Section: Geochemical Processesmentioning

confidence: 99%

Comparison of arsenic geochemical evolution in the Datong Basin (Shanxi) and Hetao Basin (Inner Mongolia), China

Luo

Cui

et al. 2012

Applied Geochemistry

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a b s t r a c tInsightful knowledge of geochemical processes controlling As mobility is fundamental to understanding the occurrence of elevated As in groundwater. A comparative study of As geochemistry was conducted in the Datong Basin (Shanxi) and Hetao Basin (Inner Mongolia), two strongly As-enriched areas in China.The results show that As concentrations ranged from <1-1160 lg L À1 (n = 37) in the Datong Basin and <1-804 lg L À1 (n = 62) in the Hetao Basin. The groundwater is of the Na-HCO 3 type in the Datong Basin and Na-Cl-HCO 3 type in the Hetao Basin. Silicate mineral weathering and cation exchange processes dominated the groundwater geochemistry in the two study areas. Principal component analysis of 99 groundwater samples using 12 geochemical parameters indicated positive correlations between concentrations of As and Fe/Mn in the Datong Basin, but no correlation of As and Fe/Mn in the Hetao Basin. Phosphate correlated well with As in the Datong Basin and Hetao Basin, suggesting phosphate competition might be another process affecting As concentrations in groundwater. High concentrations of As, Fe, and Mn occurred in the pe range À2 to À4. The results of this study further understanding of the similarities and differences of As occurrence and mobility at various locations in China.

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Hydrogeochemical evaluation of groundwater in the lower Offin basin, Ghana

Cited by 68 publications

References 15 publications

Arsenic in African Waters: A Review

Arsenic in African Waters: A Review

Caractérisation hydrogéochimique des eaux des aquifères fissurés de la zone Guiglo-Duekoué (Ouest de la Côte d’Ivoire)

Comparison of arsenic geochemical evolution in the Datong Basin (Shanxi) and Hetao Basin (Inner Mongolia), China

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