Abstract
Chlorpyrifos ethyl was found to be widely distributed in water and sediment in Lake Naivasha. Higher levels were reported in sediment (11.2-30.0 ng g-1 dry weight (dw) in wet season than in dry season (4.7-17.4 ng g-1 dw). The mean concentration of chlorpyrifos ethyl in water in wet season ranged between 8.8 and 26.6 lg L-1 and decreased to between below detection limit to 14.0 lg L-1 in dry season. On average, higher concentrations of chlorpyrifos ethyl were observed in sediment than water samples. Statistical analysis revealed a significant difference in concentration between the seasons, and a significant interaction between seasons and mean concentrations at p B 0.05. However, levels of diazinon and carbofuran were below the detection limit in all the samples analyzed. Notably, levels of chlorpyrifos ethyl were higher than the maximum allowable limits (0.1 lg L-1) recommended by European Union for drinking water and general water quality criterion for protection of freshwater water organisms (0.083 lg L-1).
Originalsprache | Englisch |
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Seiten (von - bis) | 526-532 |
Seitenumfang | 7 |
Fachzeitschrift | Bulletin of Environmental Contamination and Toxicology |
Jahrgang | 88 |
Ausgabenummer | 4 |
DOIs | |
Publikationsstatus | Veröffentlicht - Apr. 2012 |