DIN EN ISO 5764-2009
牛奶.凝固点的测定.热敏电阻测定仪法(参考方法)(ISO 5764:2009),德文版本EN ISO 5764:2009

Milk - Determination of freezing point - Thermistor cryoscope method (Reference method) (ISO 5764:2009); English version of DIN EN ISO 5764:2009-10

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标准号

DIN EN ISO 5764-2009

发布日期

2009年10月

实施日期

废止日期

无

中国标准分类号

X16

国际标准分类号

67.100.10

发布单位

德国标准化学会

引用标准

ISO 3696 ISO 6091

被代替标准

DIN EN ISO 5764-2002 DIN EN ISO 5764-2007

适用范围

This International Standard specifies a reference method for the determination of the freezing point of raw bovine milk, heat-treated whole, reduced fat and skimmed bovine milk, as well as raw ovine and caprine milk, by using a thermistor cryoscope. The freezing point can be used to estimate the proportion of extraneous water in milk. Calculation of the amount of extraneous water is subject to daily and seasonal variations, and is not within the scope of this Internationar Standard. 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 are not representative of the original milk. NOTE 1 Sterilization and vacuum pasteurization can affect the freezing point of milk (see Reference [5]). NOTE 2 The method uses plateau-timed instruments. For routine measurements, other thermistor cryoscope methods, i.e. fixed time procedures, can be used. Guidelines for the application of other procedures are given in Annex C. NOTE 3 The limit value mentioned for the titratable acidity in Clause 1 and 9.2 applies to bovine milk. It is possible that the limit values for ovine and caprine milk are higher.

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