Abstract

Photooxidation of smoke generator fuel (SGF) No. 2 fog oil was investigated to determine qualitative changes in the chemistry of the oil and the resulting acute toxicity to the freshwater amphipod Hyallela azteca. The 48-h LC50 was about 11.5 mg total oil/L for photooxidized fog oil. Toxicity was related to the greater solubility of photooxidized fog oil in that higher concentrations of total dissolved oil in oil-water mixtures were obtained after equivalent additions of photooxidized oil and nonphotooxidized oil. Photooxidation caused increases in carbonyl oxygen and the presence of alpha- and beta-unsaturated ketones and acetophenones in aqueous extracts. There was no evidence for the formation of phenolic compounds in the photooxidized fog oil or in oil-water mixtures.

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