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Organochlorine pesticides (OCPs) are chlorinated hydrocarbons extensively used for agriculture pest control and mosquito control from 1940s to 1960s. The use of OCPs for agricultural purpose was banned in many countries including Ethiopia. However, studies show that small scale farm holders in the central rift valley of Ethiopia use cocktail of pesticides including banned OCPs. This study was intended to detect the status of (OCP) residues in Ziway Lake, Oromia region of Ethiopia. For this study three commercially important fish species, sediment and succulent grass samples were randomly collected in replicate. The samples were extracted using USEPA (354  ̊C) method and the analysis was done using USEPA (8081) method. The health risk assessment was calculated based on USEPA (1996) guidelines while the data analysis was done using SAS 93.2 statistical software. The Laboratory result revealed that Dichlorodiphenyltrichloroethane (DDT) metabolites, (PP’DDT and PP’DDE) were detected in all the three sample types. Accordingly, mean concentration of PP’DDT and PP’DDE detected in the three sample types were, 52.08 and 4.67 ng/g in succulent grass, 46.84 and 0.93 ng/g in sediment and 19.83 and 11.17 ng/g in fish samples. Among the three fish species tested, the maximum DDT metabolite residue detected was in Ciprinu scarpio fish spices (35.65 ng/g) while the minimum was in Carassius carassius fish spices (27.05 ng/g). People who regularly consume fish from the lake above estimated mean Ethiopian daily consumption (0.027 kg day-1), level are exposed to DDT while that those consume all species of fish from Lake below estimated mean , does not exposed to health problem . However, the low PP’DDE /PP’DDT ratio in sediment and succulent grass sample indicates that there is a recent pollution of the lake by DDT. Thus, Eco-system clearance from obsolete pesticides and control of illegal band organochlorine pesticide movement has to be given due attention.

Detection of Organochlorine Pesticide Residues in Lake Ziway and Health Risk Assessment