Selected Heavy Metals in Water and Sediments and Their Bioconcentrations in Plant (<i> Polygonum pulchrum</i>) in Sosiani River, Uasin Gishu County, Kenya
- 1 Department of Environmental Biology and Health, School of Environmental Studies, University of Eldoret, Eldoret, Kenya
- 2 Department of Environmental Biology and Health, School of Environmental Studies, University of Eldoret, Eldoret, Kenya
- 3 Department of Chemistry, School of Science, University of Eldoret, Eldoret, Kenya
Abstract
Heavy metals ’ availability and accumulation along the food chain pose public health risks. Water, sediment and plant samples were collected from selected sampling sites along Sosiani River, Uasin Gishu County, Kenya. The sediment and plant samples were dried in the oven at 50°C to constant weight and digested in a mixture of acids according to standard procedures. The water samples, sediments and plants digests were analy z ed for selected heavy metals using Atomic Absorption Spectrophotometer (model AAS Variant 200). The site near the Moi Teaching and Referral Hospital (MTRH) had the highest total heavy metals concentration in water: Cu (0.18 ± 0.04 ppm); Pb (0.46 ± 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. Fractionation of heavy metals in sediments showed low percentage solubility (Cu 9.3%; Pb 8.5%; Zn 4.2%). Concentration of zinc in studied plants was highest (3.60 ± 0.63 ppm), with a bioconcentration factor of 15.1 based on soluble zinc fraction. This indicates that conditions in the study area show preferential zinc metal uptake in plants and may lead to accumulation in exposed plants posing Zn exposure risks a long the food chain. Suggestions are made for monitoring of heavy metals in food crops and aquatic organisms such as fish in the study area .
- R. S. Dobson and J. E. Burgess, “Biological Treatment of Precious Metal Refinery Wastewater: A Review,” Mineral Engineering, Vol. 20, No. 6, 2007, pp. 519-532. doi:10.1016/j.mineng.2006.10.011
- C. V. Miller, G. D. Foster and B. F. Majedi, “Base Flow and Storm Flow Metal Fluxes from Two Small Agricultural Catchments in the Coastal Plain of Chesapeake Bay Basin, United States,” Applied Geochemistry, Vol. 18, No. 4, 2003, pp. 483-501.
- D. L. Osmond, D. E. Line, J. A. Gale, R. W. Gannon., C. B. Knott, K. A. Bartenhagen, et al., “Water, Soil and Hydro-Environmental Decision Support System,” 1995. www.water.ncsu.edu/watersheds/info/hmetals.html
- M. Dassenakis, M. Scoullos and A. Gaitis, “Trace Metals Transport and Behaviour in the Mediterranean Estuary of Archeloos River,” Marine Pollution Bulletin, Vol. 34, No. 2, 1997, pp. 103-111.
- H. Akcay, A. Orcuz and C. Karapire, “Study of Heavy Metal Pollution and Speciation in Buyak Menderes and Gediz River Sediments,” Water Research, Vol. 37, No. 4, 2003, pp. 813-822. doi:10.1016/S0043-1354(02)00392-5
- R. Nicolau, A. Galera-Cunha and Y. Lucas, “Transfer of Nutrients and Labile Nutrients from the Continent to the Sea by Small Mediterranean River,” Chemosphere, Vol. 63, No. 3, 2006, pp. 469-476. doi:10.1016/j.chemosphere.2005.08.025
- Y. Suziki, A. Nogi and T. Fukasawa, “Gall L Protein, an Auxiliary Transcription Activator for Genes Encoding Galactose-Metabolizing Enzymes in Saccharomyces cereuisiae,” Molecular and Cellular Biology, Vol. 8, No. 11, 1988, pp. 4991-4999.
- E. O. Oyewo, “Industrial Sources & Distribution of Heavy Metals in Lagos Lagoon and Their Biological Effects on Estuarine Animals,” Ph.D. Thesis, University of Lagos, Lagos, 1998.
- A. A. Otitoloju and K. N. Don-Pedro, “Integrated Laboratory and Field Assessments of Heavy Metals Accumulation in Edible Periwinkle, Tympanotonus fuscatus var. Radula (L),” Ecotoxicology and Environmental Safety, Vol. 57, No. 3, 2004, pp. 354-362.
- A. Lozak, K. Soltyk, P. Ostapezuk and Z. Fijalek, “Determination of Selected Trace Elements in Herbs and Their Infusions,” Science of the Total Environment, Vol. 14, No. 1-3, 2001, pp. 1-8.
- L. J. Tsai, K. C. Yu, S. F. Chen and P. Y. Kung, “Effect of Temperature on Removal of Heavy Metals from Contaminated River Sediments via Bioleaching,” Water Research, Vol. 37, No. 10, 2003, pp. 2449-2457.
- N. López-González, J. Borrego, J. A. Morales, O. Carro and O. Lozano-Soria, “Metal Fractionation in Oxic Sediments of an Estuary Affected by Acid Mine Drainage (Southwestern Spain),” Estuarine, Coastal and Shelf Science, Vol. 68, No. 3-4, 2006, pp. 297-304.