October 20, 2015 • Permeable apatite barriers can protect water sources from contamination. ALBUQUERQUE, N.M. — Sandia National Laboratories geochemist Mark Rigali and his colleagues are developing and deploying apatite-based technologies to protect groundwater at sites contaminated by radionuclides and heavy metals. Apatite is currently being used at the U.S. Department of Energy’s Hanford...