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Sodium nitrate is a salt that is often added to jerky, bacon and luncheon meats. Sodium nitrite, on the other hand, is a salt and antioxidant that is commonly used to cure ham and bacon. Both chemicals act as food preservatives and add a red or pink color to processed meats, among other uses.
Sources of Sodium Nitrite. Diet is responsible for the highest level of exposure to nitrites, due to nitrate fertilizer on crops that accumulate in foods, according to the New Hampshire Department of Environmental Services. An average American diet accounts for 75 to 100 milligrams per day of nitrate exposure.