Publications by authors named "David M K Ongeri"
Influence of agricultural activities and seasonality on levels of selected physico-chemical parameters and heavy metals along River Yala in Lake Victoria Basin.
Environ Monit Assess
November 2023
Article Synopsis
- - The study investigated how human activities and seasonal changes affect the water quality and heavy metal concentrations in River Yala (RY) in the Lake Victoria basin by analyzing various physico-chemical parameters and ecological risks across different agricultural sites during both dry and wet seasons.
- - Sample analysis revealed significant variability in parameters like electrical conductivity, turbidity, and heavy metal levels, with water and sediment data differing between pristine upstream areas and various agricultural farms, indicating a potential pollution impact from farming activities.
- - The results showed that the wet season generally had a more pronounced effect on the levels of contaminants compared to the dry season, and specific heavy metals exhibited distinct correlations based on seasonal conditions, highlighting the importance of monitoring these factors for ecological health.
Trace metals Cadmium (Cd), Lead (Pb), Copper (Cu), Zinc (Zn) and Iron (Fe) were analyzed in edible portions of three main finfish species namely Lates niloticus, Oreochromis niloticus and Rastrineobola argentea sampled from various beaches of Winam Gulf, Lake Victoria, Kenya, in order to determine any seasonal and site variations and the results showed significantly (p < 0.05) higher mean concentrations of Cd, Cu, Zn and Fe during the wet season compared to the dry season for all the three species indicating the impact of wash-off into the lake during the rainy periods. The overall mean concentrations of the heavy metals (in μg/g dry weight) in all combined samples ranged from 0.
View Article and Find Full Text PDFImpact of fertilizers on heavy metal loads in surface soils in Nzoia nucleus Estate Sugarcane Farms in Western Kenya.
Bull Environ Contam Toxicol
December 2010
Analysis of heavy metals in top soil samples from Nzoia sugarcane farms in Western Kenya found elevated levels of heavy metals in the soils with mean concentrations (mg kg⁻¹ dry weight) of 142.38, 59.12, 73.
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