Dispersant

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.

In-depth integrity testing of three dispersants: Corexit 9572, NalcoD4106 and Goldcrew was carried out to determine key physical characteristics of the dispersants and toxicity to the larvae of Chironomous transvaalensis Keiffer (Diptera:Chironomidae). The result revealed that Corexit 9527 and Goldcrew maintained their integrity while NalcoD4106 on the other hand deteriorated in storage. Static bioassay conducted to determine the 96hr LC50for the dispersants against the insect species showed that Corexit 9572 was the least toxic followed by Goldcrew and Nalco D4106.