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Not to be confused with Sodium bicarbonate. Potassium bicarbonate (also known as potassium hydrogen carbonate or potassium acid carbonate) is a colorless, odorless, slightly basic, salty substance.According to the U.S. Food and Drug Administration (FDA), potassium bicarbonate is  generally recognized as safe .There is no evidence of human carcinogenicity, no adverse effects of overexposure, and an undetermined LD50. It is among the food additives encoded by European Union, identified by the initials E 501.ccording to the U.S. Food and Drug Administration (FDA), potassium bicarbonate is  generally recognized as safe . There is no evidence of human carcinogenicity, no adverse effects of overexposure, and an undetermined LD50. It is among the food additives encoded by European Union, identified by the initials E 501.
Potassium metabisulphite, K2S2O5, is a white crystalline powder or white granules with a pungent sulfur odour. The main use for the chemical is as an antioxidant or chemical sterilant. Potassium bisulfite belongs to the sulfite group of preservatives.Sulfites are characterized by containing sulfur and oxygen.Potassium bisulfite is also referred to as potassium metabisulphite or potassium metabisulphite powder.This preservative is found naturally in wine. Known as an antioxidant preservative, potassium bisulfite has some antioxidant capabilities,meaning it can fight inflammation causing free radicals in the body.he main use for the chemical is as an antioxidant or chemical sterilant. Potassium bisulfite belongs to the sulfite group of preservatives. Sulfites are characterized by containing sulfur and oxygen. Potassium bisulfite is also referred to as potassium metabisulphite or potassium metabisulphite powder.