GB/T 22725-2008 PDF in English
GB/T 22725-2008 (GB/T22725-2008, GBT 22725-2008, GBT22725-2008)
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Inspection of grain and oils -- Determination of pure kernel yield of grain and oils
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Standards related to (historical): GB/T 22725-2008
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GB/T 22725-2008: PDF in English (GBT 22725-2008) GB/T 22725-2008
GB
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 67.040
B 20
Inspection of grain and oils - Determination of pure kernel
yield of grain and oils
ISSUED ON: NOVEMBER 16, 2008
IMPLEMENTED ON: JANUARY 20, 2009
Issued by: General Administration of Quality Supervision, Inspection and
Quarantine of PRC;
Standardization Administration of PRC.
Table of Contents
Foreword ... 3
1 Scope ... 4
2 Normative references ... 4
3 Terms and definitions ... 4
4 Instruments and utensils ... 5
5 Lighting and environmental requirements ... 5
6 Sampling and sample reduction ... 5
7 Operation methods ... 5
8 Calculation of results ... 5
Inspection of grain and oils - Determination of pure kernel
yield of grain and oils
1 Scope
This standard specifies the terms and definitions, instruments and utensils, lighting and
environmental requirements, sample preparation, operation methods and result
calculation of the inspection of pure kernel yield and purity rate in grain and oilseeds.
This standard applies to the determination of pure kernel yield and purity rate in grain
and oilseeds.
2 Normative references
The provisions in the following documents become the provisions of this standard
through references in this standard. For the dated references, the subsequent
amendments (excluding corrections) or revisions do not apply to this standard, however,
parties who reach an agreement based on this standard are encouraged to study if the
latest versions of these documents are applicable. For undated references, the latest
edition of the referenced document applies to this standard.
GB 5491 Inspection of grain and oilseeds - Methods for sampling and sample
reduction
GB/T 5494-2008 Inspection of grain and oils - Determination of foreign matter and
unsound kernels of grain and oilseeds
GB/T 22505 Inspection of grain and oils - Sensory analysis environment-lighting
3 Terms and definitions
The following terms and definitions apply to this standard.
3.1 pure kernel yield
The proportion of the grain and oilseed kernels from which foreign impurities have
been removed in the mass fraction of the sample, of which the unsound kernels are
calculated as half of their masses.
3.2 purity rate
The proportion of kernels of net grain after the removal of seedcase in the mass fraction
of the sample, of which the unsound kernels are calculated as half of their masses.
4 Instruments and utensils
4.1 Balance: The scale value is 0.01 g or 0.1 g.
4.2 Grain screen.
4.3 Electric filter.
4.4 Sample splitter or sample divider.
4.5 Analysis plate, scissors, tweezers, etc.
5 Lighting and environmental requirements
The lighting and environmental requirements during the inspection shall meet the
requirements of GB/T 22505.
6 Sampling and sample reduction
They shall be carried out according to the provisions of GB 5491.
7 Operation methods
7.1 Inspection of pure kernel yield and purity rate of net grain
From the samples that have been inspected for foreign impurities, weigh the net sample
(m) according to the provisions of “small sample mass” in Table 1 of GB/T 5494-2008,
pick out the unsound kernels according to provisions of quality standards, and then
weigh the net sample (m1).
7.2 Inspection of pure kernel yield and purity rate of gross grain
According to the provisions of GB/T 5494-2008, weigh the sample (m) for inspection
of foreign impurities and unsound kernels. Weigh the unsound kernel mass (m1) and
foreign impurity mass (m2) respectively.
8 Calculation of results
8.1 The pure kernel yield and purity rate (X) of net grain are calculated according to
......
Source: Above contents are excerpted from the PDF -- translated/reviewed by: www.chinesestandard.net / Wayne Zheng et al.
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