The sulfate ion is part of many salts, such as Na2SO4. Salts are commonly found in nature and are easily soluble in water, causing sulfate contamination. In power plants, sulfate ions can also get into water from breakdown of sulfonated resins. METTLER TOLEDO sulfate analyzers are an on-line device used for automated ppb-level monitoring of sulfate in a water stream to alert users of potential corrosion or damage.