Pedological characteristics related to groundwater occurrence in the Tarkwa area, Ghana

Kuma, Jerry S.; Younger, Paul L.

doi:10.1016/s0899-5362(01)80069-5

Cited by 26 publications

(18 citation statements)

References 4 publications

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“…Most groundwaters in southern Ghana, in particular, fall within that range and the reasons are likely related to local geology. Kuma & Younger (2001) reported that the pH of the soils in the Tarkwa area varies from very acidic to moderately acidic, a condition attributed to the tropical climate and lush vegetation. Arsenic concentrations in the groundwaters ranged from < 0.1 µg l -1 to 4 µg l -1 (Table 1).…”

Section: Resultsmentioning

confidence: 99%

“…Thus, a health risk to the people of Tarkwa consuming Mn-contami-nated water is of great concern. The geology of the Tarkwa area consists of Tarkwaian and Birimian systems (Kuma & Younger, 2001) and manganese-bearing horizons are quite ubiquitous in rocks of the Birimian suite.…”

Section: Concentration (µG ℓ -1 )mentioning

confidence: 99%

“…Rainfall peaks during two periods, April-June and October-November, with an annual mean rainfall of 1933 mm (Akabzaa, 2000). Relative humidity for the area ranges from 83% to 91% with temperature varying between 28 °C and 33 °C (Kuma & Younger, 2001). The Tarkwa District is part of an extensive drainage basin known as the Ankobra basin, comprising the Ankobra river and its tributaries.…”

Section: Introductionmentioning

confidence: 99%

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Evaluation of urinary arsenic as an indicator of exposure to residents of Tarkwa, Ghana

Asante¹,

Agusa²,

Kubota³

et al. 2009

West African Journal of Applied Ecology

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In Ghana, mining plays a significant role in the economic recovery programme. However, the gains are achieved at the cost of environmental and human health. For many years, the extraction of gold involved roasting which released airborne particles and large quantities of arsenic (As). Sampling for this study was conducted in March 2004 to assess the contamination status of trace elements, especially As, in water and mine workers in Tarkwa, which has nearly a century of gold mining history. Water and human urine samples were collected from Tarkwa, in addition to control samples taken from Accra, the capital of Ghana. Arsenic excretion was assessed in the first morning void urine. Concentrations of As and Mn in some water samples from Tarkwa were above the WHO drinking water guidelines. A potential health risk of As and Mn is a concern for the people consuming the contaminated water in this area. Levels of trace elements in water from control site were low compared to levels from Tarkwa. The mean urinary As concentration of 260 µgl -1 from the study area was comparable to those in Asendemic areas of the world. This indicates relatively high degree of human exposure to As in Tarkwa, Ghana. Relatively low levels of As in water and no significant difference of As concentrations in urine between Tarkwa and Accra may suggest the presence of other sources of As contamination in Ghana, possibly food. This is the first study reporting 23 trace elements in human urine samples from a mining town in Ghana.

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Section: Resultsmentioning

confidence: 99%

Section: Concentration (µG ℓ -1 )mentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Evaluation of urinary arsenic as an indicator of exposure to residents of Tarkwa, Ghana

Asante¹,

Agusa²,

Kubota³

et al. 2009

West African Journal of Applied Ecology

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“…The area is highly dissected and has moderate relief with a general decrease in elevation southwards (Kuma, 2007). The main types of soil in the area are the forest oxysols in the south and the forest ochrosol-oxysol in the north (Asklund & Eldvall, 2005), and consists mostly of silty-sands with minor patches of laterite (mainly on the hilly areas) and underlain by the Banket Series and Tarkwa Phyllite rocks (Kuma & Younger, 2001;Kortatsi, 2004).…”

Section: Study Area Descriptionmentioning

confidence: 99%

“…The analyzed data was used as input for the Hydrus-1D Computer code (Šimunek et al, 2005) and the modelling of bottom fluxes in the estimation of the potential recharge. Soil properties representing the four main soil types (Huni, Tarkwa Phyllite, Banket and Kawere) were determined for each of the profile components in describing the soil profile using the results of infiltration tests technique used by Kuma and Younger (2001). The soil hydraulic parameters, as presented in Table 1, were estimated using the pedo-transfer function model, Rosetta (Schaap et al, 2001).…”

Section: Meteorological Datamentioning

confidence: 99%

Characterization of Potential Direct Recharge in the Gold Mining District of South-Western Ghana Using the Hydrus-1D Computer Code

Sam¹,

Amoako²,

Sefa-Ntiri³

et al. 2018

JGG

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The mean annual potential recharge rate to the ground water system in the Tarkwa gold mining district of South Western Ghana, has been estimated for the period 1977 to 2001 by analyzing precipitation recharge in response to rainfall pattern and distribution for the four main soil types; Huni, Tarkwa Phyllite, Banket and Kawere. Using the Hydrus-1D infiltration computer code model, simulation results of recharge-precipitation exhibited a linear relationship, and gave correlation coefficient values R 2 ranging from 0.39 to 0.55 for the four soil types and 0.72 for the composite soil. Variability of annual recharge was assigned to various reasons, including the variation in the weather pattern (rainfall, temperature, evapotranspiration etc), topography and hydraulic properties of the aquifer system. The potential direct recharge rate was estimated to range from 269 mm/yr to 611 mm/yr, with an average value of 385 mm/yr. This is as a result of infiltration of about 18% to 36% (average 27%) of the mean annual precipitation. The high average value of 385 mm/yr is reasonable on the basis that it represents the potential maximum value of the actual recharge value of 299±72 mm/yr.

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Hydrogeological studies on the Tarkwa gold mining district, Ghana

Kuma

2006

Bull Eng Geol Environ

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Pedological characteristics related to groundwater occurrence in the Tarkwa area, Ghana

Cited by 26 publications

References 4 publications

Evaluation of urinary arsenic as an indicator of exposure to residents of Tarkwa, Ghana

Evaluation of urinary arsenic as an indicator of exposure to residents of Tarkwa, Ghana

Characterization of Potential Direct Recharge in the Gold Mining District of South-Western Ghana Using the Hydrus-1D Computer Code

Hydrogeological studies on the Tarkwa gold mining district, Ghana

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