GB/T 5413.7-1997 Determination of ash content in infant formula and milk powder

This standard specifies the determination of ash content. This standard is applicable to the determination of ash content in infant formula and milk powder. GB/T 5413.7-1997 Determination of ash content in infant formula and milk powder GB/T5413.7-1997 Standard download decompression password: www.bzxz.net

GB/T5413.7-1997
This standard only modifies the text format of the determination of ash content in milk powder in Chapter A.4 of GB5413-85, and the content is not changed. This series of standards replaces GB5413-85 from the date of implementation. This standard is proposed by the China Light Industry Federation.
This standard is under the jurisdiction of the National Dairy Standardization Center. The responsible drafting unit of this standard: National Dairy Product Quality Supervision and Inspection Center. Participating drafting units of this standard: Food Hygiene Supervision and Inspection Institute of the Ministry of Health, Zhejiang Light Industry Research Institute, Harbin Morinaga Dairy Co., Ltd., Nestlé (China) Investment Services Co., Ltd. The main drafters of this standard: Wang Yun, Huang Min, Zhou Hong. 249Www.bzxZ.net
National Standard of the People's Republic of China
Infant formula foods and milk powder
Determination of ash
Milk powder and formula foods for infant and young children-Determination of ash
1 Scope
This standard specifies the method for the determination of ash. This standard applies to the determination of ash in infant formula foods and milk powder. 2 Summary of methods
GB/T5413.7—1997
Replaces GB5413—85
The mass of the residue obtained by calcining and ashing the sample below 600℃ is the ash content of the sample, expressed as mass fraction. 3 Instruments
Common laboratory instruments and:
3.1 Analytical balance.
3.2 Porcelain crucible: 40~60mL. After washing with clean water, soak it in aqua regia for 1 hour to wash away the acid solution, place it on an electric furnace and burn it for 0.5 hours, take it out, weigh it, and set it aside.
3.3 Electric furnace.
3.4 ​​High temperature furnace: maintain the temperature at about 550℃. 3.5 Dryer: equipped with effective desiccant.
3.6 Crucible clamp.
4 Operation steps
4.1 Weigh about 3-5g of sample (accurate to 0.2mg) in a prepared and weighed crucible, place it on an electric furnace for preliminary burning, and carbonize it until it is smokeless.
4.2. Move it into a high temperature furnace and maintain the temperature at about 550℃, burn it until it becomes white ash (about 2 hours), cool it to 100-200℃, take it out, put it in a dryer and cool it to room temperature (about 30 minutes), and weigh it. 4.3 Repeat 4.2 until the difference in mass before and after does not exceed 2mg. 5 Result expression
Ash content in sample (%) = \two × 100
Where: mi-
Mass of empty crucible, g
-Mass of sample, g:
ms-—Mass of crucible with sample after ash treatment, g. Approved by the State Administration of Technical Supervision on May 28, 1997 250
· (1)
Implemented on September 1, 1998
The result is accurate to 0.01%.
6 Tolerance
GB/T5413.7--1997
The difference between two measured values ​​of the same sample shall not exceed 0.05% of the average value of the two measurements. 251
Tip: This standard content only shows part of the intercepted content of the complete standard. If you need the complete standard, please go to the top to download the complete standard document for free.