Senior research scientist Robert Sanford, left, and professor Craig Bethke, both in geology, have discovered “important links between the amount of organic material dissolved in the groundwater and the concentrations of sulfate and arsenic.” Photo: Kwame Ross

“This is a promising idea but. of course, one that needs to be carefully tested before being implemented,” said Bethke.

This article is from James E. Kloeppel at the University of Illinois Urbana-Champaign News Bureau. Jenni Spinner contributed to this report.