Citation:
Simon, Mburu, N., Ngari, S.K. & Njoroge, B.N.K., 2001. Application of Ground Charcoal in the Removal of Organic Matter in Water Treatment. East African journal of Engineering.
Simon M. Njoroge
Senior Lecturer
Head of Department of Environmental Health, School of Public Health
Recent Publications
Njoroge, S.M., Osano, O. & Mutuku, M.T., 2015. IPM AMELIORATES RISKS OF GROUNDWATER PESTICIDE CONTAMINATION IN LAKE NAIVASHA BASIN, KENYA. International Journal of Science Technology and Management, 4(1), p.253-258. IPM AMELIORATES RISKS OF GROUNDWATER PESTICIDE CONTAMINATION IN LAKE NAIVASHA BASIN, KENYA Abstract
Increasing use of pesticides threatens the quality of groundwater with contamination. The objective of the study
was to assess the use of integrated pest management (IPM) in reducing the risks of groundwater contamination
in Lake Naivasha basin, Kenya. Interviewer administered questionnaires were used to collect data on types and
quantities of pesticides used; and other methods used to control weeds, pests and plant diseases. The results
showed that 141 pesticides were used in the basin and that 75% of farms were applying pesticides in high
quantities. All the farms were also using IPM where pesticides and other conservative means were applied.
Majority of farms (62.5%) reported average harvest when IPM methods were used. It was concluded that IPM
program around Lake Naivasha is still in its initial stages and in transition from intensive pesticide use. The
risk of groundwater contamination in the lake basin is therefore still high.
Gichuho, C.M., Njoroge, S.M. & Wambui, W.F., 2013. Land Cover Change and Deforestation in Gazetted Maji Mazuri Forest, Kenya. International Journal of Science and Research, 2(4), p.563–566. Abstract
Loss of forest cover and forest degradation are of global and national concern. Among other things, such changes can lead
to reduction in stream discharges, increased erosion and loss of biodiversity, which may alter the functioning and values of affected
ecosystems. This study used three Landsat images acquired in 1975, 1986 and 2005, to determine land cover changes and likely
environmental impacts in Maji Mazuri forest in Kenya. The results of the analysis showed that between 1975 and 2005, natural forest
decreased by about 42.31%. The likely environmental impacts include loss of biodiversity, soil erosion, and changes in forest hydrology.
All stakeholders should be involved in policy formulation and implementation for better management of this important ecological
resource.
Njoroge, S.M., et al., 2013. Pesticide Preferences and Pattern of Use along the Shore of Lake Naivasha, Kenya. Greener Journal of Environmental Management and Public Safety, 2(3), p.115-120. Pesticide Preferences and Pattern of Use along the Shore of Lake Naivasha, Kenya Abstract
Improper pesticide application has resulted in high toxicity levels causing environmental risk. The objective of the study was to determine pesticide preferences and pattern of use in farms along the shore of Lake Naivasha. Interviewer administered questionnaires and researcher observation were used to collect data on pesticides being used and pattern of use in 20 major horticultural farms around Lake Naivasha. Secondary data from journals, standards and materials safety data sheets from manufacturers were also used to determine pesticide properties such as toxicity. The results showed there were 4.3% (6) WHO class I and 14.3% (20) class II pesticides of the 141 pesticides used along the shore of Lake Naivasha. The pattern of pesticide use in the area was moderate to high and all the farms were also using Integrated Pest Management (IPM) to control pests. It was concluded that some pesticides in WHO class I that were being used along the shore of Lake Naivasha (e.g. oxamyl, methomyl and fenamiphos) are very toxic to human beings and aquatic organisms since they cause cholinesterase inhibition poisoning by inactivating the enzyme acetylcholinesterase.
Keywords: Pesticides, Environmental pollution, integrated pest management, Lake Naivasha.
Njoroge, S.M., et al., 2011. Effectiveness of incinerators in the management of medical wastes in hospitals within Eldoret municipality. East African journal of public health, 8, p.196–198.