Dartmouth Superfund Mercury Site (IMAGE) Dartmouth College Caption A Dartmouth-led study shows periphyton -- a mixture of algae, bacteria and other natural material living on submerged surfaces - is helping to transform mercury pollution from a Superfund site along a New Hampshire river into a more toxic form of the metal. Credit Kate Buckman Usage Restrictions Credit Kate Buckman 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.