Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
4427887 | Environmental Pollution | 2006 | 4 Pages |
Abstract
Nitrite (NO2â), a highly reactive chemical species, accumulates in coastal waters as a result of pollution with nitrogenous waste and/or an imbalance in the bacterial processes of nitrification and denitrification. The present study probed the impact of nitrite (NO2â) on the metabolism of polycyclic aromatic hydrocarbons (PAHs) in fish. In a laboratory experiment, exposure of euryhaline fish, Oreochromis mossambicus to industrial effluents containing PAHs in the presence of NO2â enhanced the cytochrome P450-dependent biotransformation activity determined as 7-ethoxyresorufin-O-deethylase (EROD), by nearly 36% compared to the value observed in the absence of NO2â (50.2 ± 6.74 pmol resorufin minâ1 gâ1 liver). Fixed wavelength fluorescence measurements in bile revealed maximum enhancement to have occurred in the metabolites of benzo[a]pyrene, a carcinogenic PAH. Lasting, sublethal physiological deterioration was apparent in fish exposed simultaneously to an oil refinery effluent and NO2â, from the unremittingly decreasing liver somatic index, even after the withdrawal of the contaminants.
Keywords
Related Topics
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Environmental Science
Environmental Chemistry
Authors
M.S. Shailaja, Rani Rajamanickam, Solimabi Wahidulla,