Petroleum

Toxicity of Water-Soluble Fractions of Petrol on Some Freshwater Microalgae

This study assessed the toxicity of water-soluble fractions of petrol on Chlorella vulgaris and Scenedesmus obliquus. Water soluble fractions of petrol were prepared into various concentrations as follows: 0%, 5%, 10%, 25%, 50%, 75% and 100%. These treatments were inoculated with 5 mL of the test microalgae and read at 750 nm at two-day intervals for 14 days using a UV/VIS Spectrophotometer.
AuthorName(s)
Ogbebor, Jeffrey Uyi
Ekemhankhomhen, Osarumwense Destiny

Assessment of integrity of three dispersants and their toxicity to a Brackishwater Cichlid, Sarotherodon melanotheron (Cichlidae)

Key physical characteristics of three dispersants: Corexit 9527, NalcoD4106 and Goldcrew were studied to determine their integrity and toxicity to a brackishwater fish Sarotherodon melanotheron. The results showed that with regards to the physical properties, Corexit 9527 and to a large extent Goldcrew maintained their integrity while NalcoD4106 deteriorated. Observations of the 96h LC50 static bioassay showed that the toxicity of the dispersants to the fish in an increasing order is Corexit 9527 < Goldcrew < NalcoD4106.

AuthorName(s)
J. Rotimi
M.O. Omoigberale*
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