Oxygen IsotopesIsotope LabelingIsotopesWaterNitrogen IsotopesCarbon IsotopesWater SupplyZinc IsotopesSulfur IsotopesDeuteriumIron IsotopesBody WaterFresh WaterStrontium IsotopesWater PurificationRadioisotope Dilution TechniqueWater PollutionWater Pollutants, ChemicalIndicator Dilution TechniquesMass SpectrometryWater PollutantsDeuterium OxideKineticsGas Chromatography-Mass SpectrometryMercury Isotopes