Graph (IMAGE) Penn State Caption This graphic shows how often various emerging organic contaminants were found in the research, and in what concentrations. Credit Heather Preisendanz research group/Penn State Usage Restrictions Non commercial use only License Licensed content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.