

-•/ '"^"^''-^c- ;•■• ■•• -«'S«£P^-^ 





Artist's conception of the large plastic enclosures used in the IDOE Controlled 

 Ecosystem Pollution Experiment. 



phosphorus substitute used in soap, on the toxicity of metals to 

 marine phyloplankton; the development of bioassay procedures to 

 assess acute toxicity levels for oils and oil dispersants; the 

 determination of safe periods of exposure to chlorine for different 

 phyloplankton species; and the determination that 4 parts per 



107 



