title: Hydrogen isotope ratios in a recycling system.
mesh_terms: D003903:Deuterium / Q000032:analysis*; D006859:Hydrogen / Q000032:analysis*; D011634:Public Health; D012498:Sanitary Engineering; D014481:United States; D014867:Water / Q000032:analysis*; D014876:Water Pollution / Q000517:prevention & control; D014881:Water Supply
chemical_list: D014867:Water; D006859:Hydrogen; D003903:Deuterium