Über die Beurteilung von Milch auf Grund des Ammoniakgehaltes

Section C. Dairy Chemistry

“…Kluge (97) has found that fresh milk contains 1-3 p.p.m. of ammonia, a value not affected by stage of lactation but increased in milk from infected udders.…”

Determination of Ammonia and Urea in Milk

“…Other groups of workers, notably Kieferle and Gloetzl (S), Burstein and Frum (3), and Kluge (9), have made different adaptations of the Folin and Bell (J) Permutit procedure originally designed for the determination of ammonia in urine. Recently, Niemczycki and Gerhardt (It), Polonovsky and Boulanger (14), and other groups of workers have reported the use of a combination of steam and vacuum distillation carried out on an aqueous deproteinized milk filtrate in an apparatus devised originally by Pamas and Heller (12), for the determination of ammonia in blood.…”

“…THE method for determining the equivalent acidity and basicity of fertilizers (9), the acid solution of the fertilizer is titrated by means of methyl red to an end point corresponding to the neutralization of the first hydrogen of phosphoric acid. That methyl red gives the desired end point was shown by the fact that the equivalent basicity values of mono-, di-, and tricalcium phosphates were found to agree with the theoretical values.…”