Читать книгу Foods and Their Adulteration - Harvey Washington Wiley - Страница 12

—The term ash is applied to the residue left after the burning of food products in the air at a low temperature until the carbon has disappeared. Ash is rather an indefinite term and is applied to that residual material of a mineral nature composed of sand or silica and the carbonates or oxids of alkaline earth or alkalies. The ash also contains the principal part of phosphorus present in food products and usually a small proportion of sulfur. These bodies in the ash exist as phosphoric and sulfuric acids or their salts.