| Abstrakt: |
The study was aimed at comparing the bioaccumulation of BTEX and organochlorine pesticides (OCP) in the intestine of host fish—Synodontis clariasrelative to water and in its parasite—Wenyonia acuminatarelative to host intestine. The study was carried out in Lekki lagoon, Nigeria, between April and August, 2017. BTEX was analyzed in water, fish, and parasite tissues using the EPA method 8260B Agilent 7890B gas chromatograph coupled to a mass spectrophotometer (GC-MS). Organochlorophosphate (OCP) was analyzed in tested media using Agilent 7890B gas chromatograph coupled to flame ionization detector (FID). High concentrations of most BTEX components such as benzene, toluene, chlorobenzene, ethylbenzene, meta- and para-xylene (m + p-xylene), and ortho-xylene (o-xylene) bioaccumulated into the intestinal tissues of S. clariasfrom the water medium. This is partly attributable to the fact that the S. clariasis a detritus and bottom feeder and to the hydrophilic properties of the components of BTEX. Despite the significant concentrations of benzene, toluene, and chlorobenzene accumulated in the intestine of S. clarias, no intestine-parasite partition coefficient was observed in the W. acuminata, i.e., the chemicals were not accumulated by the intestinal parasite. This is attributable to very low bioaccumulation factors of the chemicals in W. acuminata. W. acuminataexhibited significant bioaccumulation of 4,4-DDT, endosulfan 1, aldrin, and heptachlor, irrespective of their concentrations in the water and intestine of S. clarias. This indicates high affinity for the OCPs in the parasites. Synodontis clariasof Lekki lagoon showed higher vulnerability to the BTEX than the OCPs in the aquatic habitat. This implies that Lekki lagoon was impacted by oil-related anthropogenic activities. Weyonia acuminataexhibited some tendency to alleviate concentrations of the OCPs in S. clarias. It is more imperative to mitigate the activities that release BTEX into the aquatic environment. |
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