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首页> 外文期刊>Lakes & reservoirs: Research and management >Organochlorine pesticide residues in water, sediments and Nile tilapia (Oreochromis niloticus) of Lake Nakuru, Kenya and implications for its fishery
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Organochlorine pesticide residues in water, sediments and Nile tilapia (Oreochromis niloticus) of Lake Nakuru, Kenya and implications for its fishery

机译：Organochlorine pesticide residues in water, sediments and Nile tilapia (Oreochromis niloticus) of Lake Nakuru, Kenya and implications for its fishery

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摘要

The present study was conducted to assess the levels of selected organochlorinepesticide (OCP) residues in water, sediments and Nile tilapia, as well as the potentialhealth risks to humans who consume the fish of Lake Nakuru. Nine compositewater and nine sediment samples, as well as 30 fish specimens, were collectedfrom five representative sampling sites within Lake Nakuru. The OCPs targeted inthe present study included p,p′-Dichlorodiphenyldichloroethane (p,p′-DDD),p,p′-dichlorodiphenyldichloroethylene(p,p′-DDE),p,p′-dichlorodiphenyltrichloroethane(p,p′-DDT),heptachlor, heptachlor epoxide, α endosulfan (1), β endosulfan (2), endosulfansulphate, endrin, lindane, aldrin, dieldrin, methoxychlor and hexachlorocyclohexanes(alpha; beta; gamma; delta). Except for aldrin, all 16 OCPs targeted in the presentstudy were detected. The OCP residue levels ranged from below detection limit (BDL)to 7.44 ± 0.66 μg/L, BDL to 6.39 ± 1.10 μg/kg ww and BDL to 319.74 ± 66.94 μg/kgww in water, sediment and fish samples respectively. Some OCP concentrations exhibitedsignificant differences across the sampling sites (p < .05). The residue levelof endosulfan was above the European Union standard, whereas the target hazardquotient of heptachlor epoxide was above 1, therefore being unsafe for human consumption.The present study results indicate that most of organochlorine pesticidesthough banned in Kenya are still detected in the environment, posing potential long-termhealth hazards to humans. Accordingly, environmental monitoring programmeand mitigation strategies of reducing pollutant inputs into the lake is recommended,as well as an immediate ban on harvesting and consumption of fish from Lake Nakuru.

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