Oxygen IsotopesIsotope LabelingIsotopesWaterNitrogen IsotopesCarbon IsotopesWater SupplyZinc IsotopesDeuteriumSulfur IsotopesIron IsotopesBody WaterFresh WaterStrontium IsotopesRadioisotope Dilution TechniqueWater PurificationWater PollutionIndicator Dilution TechniquesWater Pollutants, ChemicalMass SpectrometryCarbon RadioisotopesKineticsRadioisotopesDeuterium OxideWater PollutantsGas Chromatography-Mass SpectrometryMercury Isotopes