GB/T 5413.8-1997 Determination of moisture content in infant formula and milk powder

This standard specifies the method for determining moisture content. This standard is applicable to the determination of moisture content in infant formula and milk powder. GB/T 5413.8-1997 Determination of moisture content in infant formula and milk powder GB/T5413.8-1997 Standard download decompression password: www.bzxz.net

GB/T5413.8-—1997
This standard is equivalent to the International Dairy Federation standard IDF26A:1993 "Milk Powder and Cream Powder". This series of standards will replace GB5413-85 from the date of implementation. This standard is proposed by the China Light Industry General Association.
This standard is under the jurisdiction of the National Dairy Standardization Center. The responsible drafting unit of this standard is the National Dairy Product Quality Supervision and Inspection Center. The participating drafting units of this standard are: Food Hygiene Supervision and Inspection Institute of the Ministry of Health, Zhejiang Light Industry Research Institute, Harbin Morinaga Dairy Co., Ltd., and Nestlé (China) Investment Services Co., Ltd. The main drafters of this standard are: Wang Yun, Huang Min, and Zhang Chunyan. 252
National Standard of the People's Republic of China
Infant formula and milk powder
Determination of the water content
Milk powder and formula foods for infant and young children-Determination of the water content1 Scope
This standard specifies the method for determining water content. This standard applies to the determination of water content in infant formula and milk powder. 2 Principle of the method
GB/T5413.8—1997
Replaces GB5413—85
Put the sample in an oven at 102℃±2℃ and heat until constant weight is obtained. The mass lost is the water content. 3 Apparatus
Common laboratory instruments and:
3.1 Analytical balance: sensitivity is 0.1mg. 3.2 Suitable blood: preferably aluminum, nickel, stainless steel or glass dish, equipped with a removable cover, with a diameter of 50-70mm and a height of 25mm. 3.3 Dryer: equipped with effective desiccant.
3.4 ​​Blast oven: can control the constant temperature at 102℃±2℃, the temperature in the oven should be uniform. 3.5 Bottle with sealed cap: used to mix milk powder. 4 Operation steps
4.1 Sample preparation
Put all the samples into a dry, capped bottle twice the volume of the sample, rotate and shake to mix them thoroughly (in this step, it is impossible to get a completely uniform sample, and two samples must be taken from two points far apart in the sample bottle and analyzed in parallel). 4.2 DeterminationbzxZ.net
4.2.1 Put the blood and the cap (do not put it on the blood) into an oven at 102℃±2C, heat for 1h, cover it, then move the blood into the dryer, cool it to room temperature, and weigh it.
4.2.2 Put about 3~5g of sample into the blood, cover it, and weigh it quickly and accurately. 4.2.3 Place the blood and the cap (do not place it on the blood) in an oven at 102℃±2℃ and heat for 3h. 4.2.4 Cover it, move it to a desiccator, cool it to room temperature, and weigh it quickly and accurately. 4.2.5 Place the blood and the cap (do not place it on the blood) in an oven at 102℃±2℃ again and heat it for 1h. Cover it and move it to a desiccator, cool it to room temperature, and weigh it quickly.
4.2.6 Repeat the above steps until the difference between two consecutive weighings does not exceed 0.0005g. Approved by the State Administration of Technical Supervision on May 28, 1997 and implemented on September 1, 1998
5 Result Expression
GB/T 5413. 8---1997
mj -- m2 × 100
The moisture content of the sample (%) =
Where: m1—the initial mass of the blood and the cap after adding the sample, g, - the smaller mass obtained by weighing the sample twice after drying, 8m2
m3-——the mass of the sample, g.
6 Tolerance
The maximum deviation of the two measured results shall not exceed 0.05%. 254
Special Zero
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