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AACC International Approved Methods - AACC Method 40-10.01. Aluminum -- Qualitative Method

AACC International Approved Methods

Inorganic Constituents

AACCI Method 40-10.01
Aluminum -- Qualitative Method

VIEW METHOD

Objective
To determine the presence of aluminum in baking powders and baking chemicals. Aluminum salts used in baking powders and chemicals include sodium aluminum phosphate, sodium aluminum sulfate, aluminum sulfate, ammonium aluminum sulfate, and potassium aluminum sulfate. These salts are the leavening acids that react to neutralize sodium bicarbonate, causing carbon dioxide release. Aurintricarboxylic acid is a dye that forms a bright red precipitate with aluminum salt in acetate buffer. The procedure applies to baking powder in the presence of phosphates.