A Semimicro-Kjeldahl Method for the Determination of Total Nitrogen in Milk

Abstract

A semimicro-Kjeldahl method and apparatus is described. Mercuric oxide is recommended as a catalyst with boric acid as the ammonia receiving agent and methyl red-methylene blue as the indicator. The semimicro method was found to check very closely with the Official Method. The semimicro method is useful for determining small amounts of nitrogen, it is time saving, well adapted to routine analysis, and reduces the cost of reagents per determination. © 1940, American Dairy Science Association. All rights reserved.