Selected Heavy Metals in Water and Sediments and Their Bioconcentrations in Plant Polygonum pulchrum in Sosiani River, Uasin Gishu County, KenyaReportar como inadecuado




Selected Heavy Metals in Water and Sediments and Their Bioconcentrations in Plant Polygonum pulchrum in Sosiani River, Uasin Gishu County, Kenya - Descarga este documento en PDF. Documentación en PDF para descargar gratis. Disponible también para leer online.

Heavy metals’ availability and accumulation alongthe food chain pose public health risks. Water, sediment and plant samples werecollected from selected sampling sites along Sosiani River, Uasin Gishu County,Kenya. The sediment and plant samples were dried in the oven at 50°C toconstant weight and digested in a mixture of acids according to standardprocedures. The water samples, sediments and plants digests were analyzed for selected heavy metals usingAtomic Absorption Spectrophotometer model AAS Variant 200. The site near theMoi Teaching and Referral Hospital MTRH had the highest total heavy metalsconcentration in water: Cu 0.18 ± 0.04 ppm; Pb0.46 ± 0.09 ppm and Zn 0.70 ± 0.22 ppm and sediments: Cu 1.62 ± 0.14 ppm; Pb 1.27 ± 0.17 ppm and Zn 6.73 ± 0.88 ppm respectively. Fractionationof heavy metals in sediments showed low percentage solubility Cu 9.3%; Pb8.5%; Zn 4.2%. Concentration of zinc in studied plants was highest 3.60 ± 0.63 ppm, with a bioconcentration factor of 15.1 basedon soluble zinc fraction. This indicates that conditions in the study area showpreferential zinc metal uptake in plants and may lead to accumulation inexposed plants posing Zn exposure risks along the food chain. Suggestions aremade for monitoring of heavy metals in food crops and aquatic organisms such asfish in the study area.

KEYWORDS

Bioaccumulation; Bioconcentration Factor; Food Chain; Exposure Risks

Cite this paper

J. Jepkoech, G. Simiyu and M. Arusei -Selected Heavy Metals in Water and Sediments and Their Bioconcentrations in Plant Polygonum pulchrum in Sosiani River, Uasin Gishu County, Kenya,- Journal of Environmental Protection, Vol. 4 No. 8, 2013, pp. 796-802. doi: 10.4236-jep.2013.48093.





Autor: Judith K. Jepkoech, Gelas M. Simiyu, Musa Arusei

Fuente: http://www.scirp.org/



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