The pollution status of Lake Nakuru, Kenya: heavy metals and pesticide residues, 1999/2000

Abstract

This study was carried out from April 1999 to May 2000 to investigate the extent of pollution of Lake Nakuru. Water, sediment, fish and algae collected from the lake and its feeder rivers during the dry and rainy seasons were analysed for heavy metals and organochlorine pesticide residues to identify possible sources of contaminants. Atomic absorption spectrophotometry and gas chromatography showed that more contaminants were added to the lake during the rainy season than the dry season. Heavy metals and pesticide residues were found in higher concentrations in the sediments than in the water.