Much work remains on tracking spilled Gulf oil, NOAA chief says, McClatchy, September 15, 2010:
[University of South Florida chemical oceanographer and lead scientist on the mission David Hollander's] team took water samples and fed them to marine plankton in experiments onboard the research vessel in August. Even in greatly diluted form, a lower concentration than what the EPA considers acute toxicity, the oil in the water caused a toxic effect...
The findings raised new questions about what concentrations and what compounds federal scientists should be concerned about, he said. "In spite of the low concentrations, something is in there."
Read the report here.