Resesarchers (IMAGE) University of Minnesota Caption From left to right, graduate student Snober Ahmed, Professor Abdennour Abbas and graduate student John Brockgreitens. Ahmed worked on the mercury sponge while Brockgreitens is working on expanding the concept to other pollutants. Credit Ke Xu, graduate student, CFANS Usage Restrictions with credit 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.