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chromium carbonate is a water insoluble chromium source that easily converts to other chromium compounds by heating (calcination). It has a high oxidizing ability, making it suitable for industrial applications. It is available in a wide variety of volumes and forms, including high purity, submicron and nanopowders.
Typical Applications
For United States food and dietary supplement labeling purposes, chromium content is typically expressed as a percent of the Daily Value (%DV). It is present in a number of plant and animal foods, and in some cases, it can be leached into foods when processed or cooked using stainless steel equipment.
Chemical Synthesis
The synthesis of chromium carbonate is carried out by bringing into contact a reaction solution of a carbonic acid salt and an aqueous solution containing trivalent chromium under such conditions that the reaction fluid temperature falls within the range of 0 DEG C to lower than 50 DEG C and at a pH of 6 to 12. It is preferred that after the formation of chromium carbonate, the reaction mixture is filtered and washed with water until the electric conductivity of the filtrate falls to 5mS/cm or below.
Typical Formulation
Alternatively, the synthesis of chromium carbonate can be carried out in aqueous solutions containing a mineral acid or an organic acid if this is the desired use of the product. Preferred aqueous solutions of mineral acids include phosphoric, nitric, sulfuric and hydrochloric acid. Typical aqueous solutions of organic acids include citric, acetic, lactic, malic and gluconic acid.