作者: David T. Seymour , Allen G. Verbeek , Steve E. Hrudey , Phillip M. Fedorak
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摘要: Petroleum or creosote contamination of surface waters, soils, groundwaters introduces countless aromatic compounds to these environments. Among are condensed thiophenes that were shown be oxidized sulfoxides, sulfones, and 2,3-diones by microbial cultures. In this study, the acute toxicities 12 (benzothiophene, benzothiophene sulfone, ben-zothiophene-2,3-dione, 3-, 5-methylbenzothiophenes, 5-methylbenzothiophene 5-, 7-methylbenzothio-phene-2,3-diones, dibenzothiophene, dibenzothiophene sulfoxide, sulfone) determined Microtox® Daphnia magna bioassays. To aid in determining toxicities, solubilities many determined, which showed much more water soluble than parent thiophenes. nearly every case, less toxic their The Microtox method was sensitive D. bioassay, but general, there a good correlation between measured two tests. Samples removed from batch cultures Pseudomonas strain capable oxidizing thiophenes, samples subjected These experiments culture supernatants decreased with incubation time.