National Repository :: Browsing by Author "Nyambura, Catherine"

Browsing by Author "Nyambura, Catherine"

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Cancer and non-cancer health risks from carcinogenic heavy metal exposures in underground water from Kilimambogo, Kenya
(Elsevier, 2020-03) Nyambura, Catherine; Hashim, Nadir Omar; Chege, Margaret Wairimu; Tokonami, Shinji; Omonya, Felix Wanjala
Water is very crucial for man, animals and plants because of its health implications in case it is polluted. Water has many uses like drinking for man and animals, domestic use and for agricultural use. The concentration levels of Cd, Ni and Pb in borehole water of Kilimambogo region were measured using the atomic absorption spectrometer (AAS). pH was measured on site using a digital pH standard meter. The use of fertilizers and chemicals from the neighboring small scale farms and the large pineapple farms could easily contaminate the water table. The mean heavy metal concentration for Cd, Ni and Pb were found to be 6.4, 6.9 and 42.0 ppm respectively. The mean hazard quotients (HQ) were 26.2, 1.4 and 57.0.for adults and 12.9, 0.69 and 27.9 for children for the corresponding elements. The mean carcinogenic risks for Cd, Ni and Pb were 4.9 × 10−2, 1.2 × 10−2 and 7.3 × 10−3 for adults and 1.1 × 10−2, 2.8 × 10−2 and 1.6 × 10−3 for children respectively. The mean metal pollution index (MPI) and heavy metal evaluation index (HEI) were 10 and 934, higher than the set critical threshold value of 100. Therefore, the borehole sources are enriched with heavy metals and should be periodically monitored.
Cancer and Non-Cancer Health Risks from Carcinogenic Heavy Metal Exposures in Underground Water from Kilimambogo, Kenya
(Elsevier, 2020-4) Nyambura, Catherine; Hashim, Nadir Omar; Chege, Margaret Wairimu; Tokonami, Shinji; Omonya, Felix Wanjala
Water is very crucial for man, animals and plants because of its health implications in case it is polluted. Water has many uses like drinking for man and animals, domestic use and for agricultural use. The concentration levels of Cd, Ni and Pb in borehole water of Kilimambogo region were measured using the atomic absorption spectrometer (AAS). pH was measured on site using a digital pH standard meter. The use of fertilizers and chemicals from the neighboring small scale farms and the large pineapple farms could easily contaminate the water table. The mean heavy metal concentration for Cd, Ni and Pb were found to be 6.4, 6.9 and 42.0 ppm respectively. The mean hazard quotients (HQ) were 26.2, 1.4 and 57.0.for adults and 12.9, 0.69 and 27.9 for children for the corresponding elements. The mean carcinogenic risks for Cd, Ni and Pb were 4.9 × 10−2, 1.2 × 10−2 and 7.3 × 10−3 for adults and 1.1 × 10−2, 2.8 × 10−2 and 1.6 × 10−3 for children respectively. The mean metal pollution index (MPI) and heavy metal evaluation index (HEI) were 10 and 934, higher than the set critical threshold value of 100. Therefore, the borehole sources are enriched with heavy metals and should be periodically monitored.
Cancer and Non-Cancer Health Risks from Carcinogenic Heavy Metal Exposures in Underground Water from Kilimambogo, Kenya
(Elsevier, 2020) Nyambura, Catherine; Hashim, Nadir Omar; Chege, Margaret Wairimu; Tokonami, Shinji; Omonya, Felix Wanjala
Water is very crucial for man, animals and plants because of its health implications in case it is polluted. Water has many uses like drinking for man and animals, domestic use and for agricultural use. The concentration levels of Cd, Ni and Pb in borehole water of Kilimambogo region were measured using the atomic absorption spectrometer (AAS). pH was measured on site using a digital pH standard meter. The use of fertilizers and chemicals from the neighboring small scale farms and the large pineapple farms could easily contaminate the water table. The mean heavy metal concentration for Cd, Ni and Pb were found to be 6.4, 6.9 and 42.0 ppm respectively. The mean hazard quotients (HQ) were 26.2, 1.4 and 57.0.for adults and 12.9, 0.69 and 27.9 for children for the corresponding elements. The mean carcinogenic risks for Cd, Ni and Pb were 4.9 × 10−2, 1.2 × 10−2 and 7.3 × 10−3 for adults and 1.1 × 10−2, 2.8 × 10−2 and 1.6 × 10−3 for children respectively. The mean metal pollution index (MPI) and heavy metal evaluation index (HEI) were 10 and 934, higher than the set critical threshold value of 100. Therefore, the borehole sources are enriched with heavy metals and should be periodically monitored.
Cancer and Non-Cancer Health Risks from Carcinogenic Heavy Metal Exposures in Underground Water from Kilimambogo, Kenya
(2020) Nyambura, Catherine; Hashim, Nadir Omar; Chege, Margaret Wairimu; Tokonami, Shinji; Omonya, Felix Wanjala
Water is very crucial for man, animals and plants because of its health implications in case it is polluted. Water has many uses like drinking for man and animals, domestic use and for agricultural use. The concentration levels of Cd, Ni and Pb in borehole water of Kilimambogo region were measured using the atomic absorption spectrometer (AAS). pH was measured on site using a digital pH standard meter. The use of fertilizers and chemicals from the neighboring small scale farms and the large pineapple farms could easily contaminate the water table. The mean heavy metal concentration for Cd, Ni and Pb were found to be 6.4, 6.9 and 42.0 ppm respectively. The mean hazard quotients (HQ) were 26.2, 1.4 and 57.0.for adults and 12.9, 0.69 and 27.9 for children for the corresponding elements. The mean carcinogenic risks for Cd, Ni and Pb were 4.9 × 10−2, 1.2 × 10−2 and 7.3 × 10−3 for adults and 1.1 × 10−2, 2.8 × 10−2 and 1.6 × 10−3 for children respectively. The mean metal pollution index (MPI) and heavy metal evaluation index (HEI) were 10 and 934, higher than the set critical threshold value of 100. Therefore, the borehole sources are enriched with heavy metals and should be periodically monitored.
MEASUREMENT OF RADON ACTIVITY CONCENTRATION IN UNDERGROUND WATER OF BURETI SUB-COUNTY OF KERICHO COUNTY KENYA
(Radiation Protection Dosimetry, 2020-09-08) Rotich, Charles K; Hashim, Nadir O; Chege, Margaret W; Nyambura, Catherine
The activity concentration of radon in underground water of Bureti sub-county was measured using liquid scintillating counter device. The average radon activity concentration in all the water samples was 12.41 Bql−1. The maximum and minimum activity concentrations of radon were 22.5 and 4.57 Bql−1, respectively. In total, 53% of the total samples analysed had radon concentration levels above the US Environmental Protection Agency-recommended limit of 11.1 Bql−1. The annual dose received by an individual as a result of waterborne radon was determined according to the United Nations Scientific Committee on the Effect of Atomic Radiation reports and was found to be 33.23 𝜇Svy−1. All the samples recorded a value <100 𝜇Svy−1 recommended by the World Health Organization and the European Union council.
Measurement of Radon Activity Concentration in Underground Water of Bureti Sub-County of Kericho County Kenya
(Oxford Academic, 2020) Rotich, Charles K.; Hashim, Nadir O.; Chege, Margaret W.; Nyambura, Catherine
The activity concentration of radon in underground water of Bureti sub-county was measured using liquid scintillating counter device. The average radon activity concentration in all the water samples was 12.41 Bql−1. The maximum and minimum activity concentrations of radon were 22.5 and 4.57 Bql−1, respectively. In total, 53% of the total samples analysed had radon concentration levels above the US Environmental Protection Agency-recommended limit of 11.1 Bql−1. The annual dose received by an individual as a result of waterborne radon was determined according to the United Nations Scientific Committee on the Effect of Atomic Radiation reports and was found to be 33.23 𝜇Svy−1. All the samples recorded a value <100 𝜇Svy−1 recommended by the World Health Organization and the European Union council.

Browsing by Author "Nyambura, Catherine"

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