John Onam Onyatta

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The size fraction of soils is one of the important factors that influence the retention of heavy metals. The sorptive properties of soils for heavy metals are principally associated with clay and silt-size fractions. Phosphate fertilizers that are applied to highly weathered tropical soils contain a wide concentration range of cadmium (Cd) as an impurity.(More)
Perceptions in health research are a product of the circumstances within the society, where the research activities are situated. In East Africa there has been a change in conceptualization over a period of time from an elitist de-linked status to the present, which has evolved to embrace the local community. Here we trace the changes and highlight some(More)
Kinetics of cadmium adsorption on banana stem biomass in an aqueous media was investigated. Cadmium is of particular concern because its presence in aquatic ecosystems even at low concentrations could be toxic to human health. Adsorption is one of the methods used to remove cadmium from aquatic environments. Selected amounts of cadmium ion concentrations(More)
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