This standard specifies the methods for the determination of the acidity of raw milk and dairy products, starch and its derivatives, and the acidity of grains and products. The first method of this standard is applicable to the determination of the acidity of raw milk and dairy products, starch and its derivatives, grains and products; the second method is applicable to the determination of the acidity of milk powder; the third method is applicable to the determination of the acidity of milk and other dairy products. The first method phenolphthalein indicator method 2 principle
GB 5009.239-2016 history
2016GB 5009.239-2016 Determination of food acidity in national food safety standards
2010GB/T 5517-2010 Inspection of grain and oils.Determination of acidity in grain and produce
1985GB/T 5517-1985 Inspection of grain and oilseeds--Methods for determination of acidity of grain