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GB 29202-2012: Food Additives -- Nitrogen [including 2016 Modification 1]
GB 29202-2012
GB
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
National Food Safety Standard –
Food Additives – Nitrogen
食品添加剂 氮气
ISSUED ON: DECEMBER 25, 2012
IMPLEMENTED ON: JANUARY 25, 2013
Issued by: National Health and Family Planning Commission of the
People’s Republic of China
Table of Contents
1 Application Scope ... 3 
2 Molecular Formula and Relative Molecular Mass ... 3 
3 Technical Requirements ... 3 
Annex A Test Method ... 5 
No.1 Amendment ... 7 
National Food Safety Standard –
Food Additives – Nitrogen
1 Application Scope
This Standard applies to food additive nitrogen produced by deep cooling air
separation, pressure swing absorption, membrane separation and small special
nitrogen making machine.
2 Molecular Formula and Relative Molecular Mass
2.1 Molecular formula
N2
2.2 Relative molecular mass
28.01 (in accordance with International Relative Atomic Masses 2007)
3 Technical Requirements
3.1 Sensory requirements
As specified in Table 1.
Table 1 – Sensory Requirements
3.2 Physiochemical indexes
As specified in Table 2.
Annex A
Test Method
A.1 Warning
A high-pressure gas cylinder is used in the test method of this Standard, so appropriate
safety and protection measures shall be taken.
A.2 Identification test
Insert a small wood stick ignited carefully into a test tube filled with test gas; the flame
extinguishes.
A.3 Determination of nitrogen (N2) content
The volume fraction of nitrogen (N2) content φ is calculated in accordance with the
following equation:
where
φ1 – volume fraction of oxygen determined in A.4.
A.4 Determination of oxygen (O2)
A.4.1 Electrochemical process
A.4.1.1 Method summary
Place samples in an appropriate form into an electrochemical reactor; measure and
calculate oxygen content through direct determination method or comparative
measurement method.
A.4.1.2 Apparatus
Trace oxygen analyzer: as specified in GB/T 6285.
A.4.1.3 Analysis procedure
Measurement shall be as specified in GB/T 6285; specific operation shall be as
specified in the specifications of apparatus.
A.4.2 Zirconia detector gas chromatographic method
A.4.2.1 Method summary