La présente norme fait partie d'un ensemble de normes applicables au lait et aux produits laitiers. Cet ensemble est composé de normes traitant de : l'échantillonnage des produits, méthodes d'essais physiques et chimiques, vocabulaire, contrôle microbiologique, verrerie de laboratoire spécifique. La présente norme traite plus particulièrement de la détermination du point de congélation du lait à l'aide d'un appareil (le cryoscope à thermistance).
ISO 5764|IDF 108:2002 specifies a reference method for the determination of the freezing point of raw, pasteurized, UHT-treated or sterilized whole milk, partially skimmed milk and skimmed milk by using a thermistor cryoscope. The freezing point can be used for estimating the proportion of extraneous water in milk. Calculation of the amount of extraneous water is complicated by daily variation, seasonal variation, etc. and is not within the scope of ISO 5764¦IDF 108:2002. Results obtained from samples with a titratable acidity exceeding 20 ml of 0,1 mol/l sodium hydroxide solution per 10 g of non-fat solids will not be representative of the original milk.
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