The comparative Toxicities of two petroleum Products, Automotive Gas Oil, AGO and Premium Motor Spirit, PMS on fresh and Brackish Water Habitat
Abstract
The comparative toxicities of two petroleum products, Automotive Gas Oil (AGO) and Premium Motor Spirit (PMS), were examined by exposing two species of shrimp: freshwater shrimp Desmoscaris trispinosa and brackish water shrimp Palaemonetes africanus, to acute concentrations (0.05, 0.1, 1.0, 10.0, and 100 mg/L) of these toxicants for 96 hours. The toxicity was examined in artificially contaminated environmental systems, and the median lethal concentration (LC50) was estimated using the Finney Probity method of analysis. The acute toxicity evaluation yielded 96-hour LC50 values for AGO of 0.330 mg/L for freshwater shrimp and 1.986 mg/L for brackish water shrimp, compared to 0.485 mg/L and 2.919 mg/L for PMS in freshwater and brackish water habitats, respectively. These results indicated that AGO was more toxic than PMS, and both petroleum products were more toxic to the freshwater shrimp than to the brackish water shrimp. However, the observed mean LC50 values were not significantly different at levels of p < 0.01. The findings suggest that petroleum products pose potential risks to the fauna in the shoreline and benthic sediments of the Niger Delta ecological zone. This is important because attention is often focused on visible surface spills of petroleum, while the dissolved aromatic hydrocarbons, which are more bioavailable and potentially toxic to marine organisms, are overlooked.
Keywords
Petroleum Products
Heavy Metals
Dissolved Oxygen
Cations
Anions
References
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