GB/T 22725-2008Inspection of grain and oils - Determination of pure kernel yield of grain and oils (English PDF)
粮油检验 粮食、油料纯粮(质)率检验
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Issued by
SAMR; SAC
Level / Type
National · Recommended
Issue date
November 16, 2008
Implementation date
January 20, 2009
Scope
GB/T 22725-2008 is the English-translated version of 粮油检验 粮食、油料纯粮(质)率检验.
GB/T 22725-2008 is the Chinese standard "Inspection of grain and oils -- Determination of pure kernel yield of grain and oils".
Its scope clause reads: 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. Its clauses include terms and definitions; instruments and utensils; lighting and environmental requirements; sampling and sample reduction; operation methods; calculation of results.
It was issued by the General Administration of Quality Supervision, Inspection and Quarantine on NOVEMBER 16, 2008 and took effect on JANUARY 20, 2009.
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Document preview — GB/T 22725-2008
National Standard of the People's Republic of China
- ICS
- 67.040
- Classification
- B 20
Issued by: State Administration for Market Regulation; Standardization Administration of the PRC
Contents
- Foreword3
- 1 Scope4
- 2 Normative references4
- 3 Terms and definitions4
- 4 Instruments and utensils5
- 5 Lighting and environmental requirements5
- 6 Sampling and sample reduction5
- 7 Operation methods5
- 8 Calculation of results5
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 […]
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This preview omits tables, figures, formulas and parts of the technical clauses. The complete document — 15 pages — is available in the English PDF.
Referenced standards
Normative references
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Related Standards
GB 5491-1985 — Inspection of grain and oilseeds-Methods for samplingand sample reduction
GB/T 22505-2008 — Inspection of grain and oils - Sensory analysis environment-lighting
GB/T 7251.4-2026 — Low-voltage switchgear and controlgear assemblies - Part 4: Particular requirements for assemblies for construction sites (ACS)
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