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SN/T 2115-2008: Determination of the total nitrogen content and calculation of the crude protein content in food and feed for import and export. Combustion according to the dumas principle
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| SN/T 2115-2008 | English | 469 |
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Determination of the total nitrogen content and calculation of the crude protein content in food and feed for import and export. Combustion according to the dumas principle
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SN/T 2115-2008
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PDF similar to SN/T 2115-2008
Basic data | Standard ID | SN/T 2115-2008 (SN/T2115-2008) | | Description (Translated English) | Determination of the total nitrogen content and calculation of the crude protein content in food and feed for import and export. Combustion according to the dumas principle | | Sector / Industry | Commodity Inspection Standard (Recommended) | | Classification of Chinese Standard | X04 | | Word Count Estimation | 18,198 | | Date of Issue | 2008-09-04 | | Date of Implementation | 2009-03-16 | | Regulation (derived from) | Industry standard filing Notice No. 11 of 2008 | | Issuing agency(ies) | General Administration of Customs | | Summary | This standard specifies the import and export of food and feed Dumas determination of total nitrogen, and thus calculate the crude protein content approach. This standard applies to cereals, pulses, milled cereal products, oilseeds, oil, milk and dairy products, animal feed, and the total nitrogen content of crude protein content. This standard does not apply to inorganic nitrogenous substances, organic foods Determination of non-protein substances. | SN/T 2115-2008: Determination of the total nitrogen content and calculation of the crude protein content in food and feed for import and export. Combustion according to the dumas principle
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Determination of the total nitrogen content and calculation of the crude protein content in food and feed for import and export.Combustion according to the dumas principle
Exit inspection and quarantine industry standard book People's Republic of China
Import and export of food and feed in total nitrogen and crude protein
Detection Dumas combustion method
Posted 2008-09-04
2009-03-16 implementation
People's Republic of China
The State Administration of Quality Supervision, Inspection and Quarantine released
Foreword
This standard Annex A, Annex B and Annex C is informative appendix.
This standard is proposed and managed by the National Certification and Accreditation Administration Committee.
This standard was drafted. Shanxi People's Republic of China Exit Inspection and Quarantine.
The main drafters of this standard. Xue Ping, even GY, Song Huan, Li Yuan, Du Lijun, Pan Yali, Song Jie, Kang Jie.
This standard is the first release of the entry-exit inspection and quarantine industry standards.
Import and export of food and feed in total nitrogen and crude protein
Detection Dumas combustion method
1 Scope
This standard specifies the import and export of food and feed Dumas Total Nitrogen Determination, and thus calculate the crude protein content approach.
This standard applies to cereals, pulses, milled cereal products, oilseeds, oil, milk and dairy products, animal feed containing total nitrogen content and crude protein
Determination of the amount.
This standard does not apply to inorganic nitrogenous substances, determination of organic non-protein food substances.
2 Method summary
Under aerobic conditions, the sample combustion tube combustion heating (about 900 ℃), the interference component is generated to a range of appropriate absorbent
except. For example, silver hair to absorb halogen, phosphorus pentoxide is used to absorb water, tungsten for absorbing sulfur dioxide and excess oxygen, and so on. sample
Quantitative substance of nitrogen is converted to molecular nitrogen, and a thermal conductivity detector.
3 Reagents and materials
3.1 Carbon dioxide (CO2) gas. purity not less than 99.995%.
3.2 oxygen (O2) gases. purity not less than 99.995%.
3.3 nitrogenous standard substance. aspartate (C4H7NO4) or other amino acids, 99% or greater purity.
4 instruments and equipment
Dumas 4.1 azotometer equipped with a thermal conductivity detector.
4.2 Sample grinder.
4.3 sieve, aperture 0.8mm ~ 1mm.
4.4 the crucible.
5 Sample Preparation and Storage
5.1 Sample Preparation
5.1.1 Cereals, pulses, oilseeds, oilseeds
Take a representative sample 500g, with all the crushing mill. Mix and sift, they are divided into two as a sample, divided into a clean container
In sealed and labeled.
5.1.2 senior cadres of milk or water and 17% dry low nitrogen content of 1% sample
Take a representative sample 500g, were divided into two as a sample, divided into a clean container, sealed and labeled.
5.1.3 milk, soy flour
Take a representative sample 500g, were divided into two as a sample, divided into a clean container, sealed and labeled.
5.1.4 Feed
Take a representative sample 500g, with all the crushing mill. Mix and sift, they are divided into two as a sample, divided into a clean container
In sealed and labeled.
5.2 Sample preservation
Dried samples stored at 0 ℃ ~ 4 ℃; moisture above 17% of the samples and liquid samples were stored at -18 ℃ below freezing. And sampling system
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