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China GB 5413.33-2010 National food safety standard Determination of specific gravity in raw milk

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  • Published: 2013-07-19
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Introduction
GB 5413.33—2010
National food safety standard
Determination of specific gravity in raw milk
1 Scope
This standard specifies the method for the determination of specific gravity in raw milk.
This standard applies to the determination of specific gravity in raw milk.
2 Principle
Determine the sample by densimeter and the result could be obtained by table lookup based upon the reading of the densimeter.
3 Apparatus
3.1 Densimeter: 20℃/4℃
3.2 Glass cylinder or graduated cylinder of 200 mL-250 mL capacity: the cylinder should be higher than the densimeter, and the distance between densimeter and the inner wall of the cylinder should not be shorter than 5 mm.
4 Procedure
Cautiously pour the sample which has been mixed evenly and adjusted to10℃-25℃ previously into the cylinder and measure the temperature. Foam should be avoided during the procedure. Cautiously put the densimeter into the sample till the place of scale 30° and let it float freely but keep it away from the inner wall of the cylinder. After standing for 2-3 min, read by keeping eyes horizontal to the milk surface. The density at 20℃ could be
obtained by looking up table 1 according to the reading and the temperature of the sample.
 
 
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