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GB/T 5494-2019 (GB/T5494-2019)

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GB/T 5494-2019: PDF in English (GBT 5494-2019)
GB/T 5494-2019
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 67.040
X 04
Replacing GB/T 5494-2008
Inspection of grain and oils - Determination of foreign
matter and unsound kernels of grain and oilseeds
ISSUED ON: MAY 10, 2019
IMPLEMENTED ON: DECEMBER 01, 2019
Issued by: State Administration for Market Regulation;
Standardization Administration of the PRC.
Table of Contents
Foreword ... 3 
1 Scope ... 4 
2 Normative references ... 4 
3 Instruments and utensils ... 4 
4 Lighting requirements ... 5 
5 Sample preparation ... 5 
6 Operation steps ... 5 
7 Result calculation ... 7 
Appendix A (Normative) Specification of sieve layer used for sieving samples
... 11 
Foreword
This Standard is drafted in accordance with the rules given in GB/T 1.1-2009.
This Standard replaces GB/T 5494-2008 “Inspection of grain and oils -
Determination of foreign matter and unsound kernels of grain and oilseeds”.
As compared with GB/T 5494-2008, the main technical changes of this
Standard are as follows:
- Modify the table for provisions on inspection sample mass (see Table 1;
Table 1 of the 2008 edition);
- ADD the operation steps and calculation formula for the inspection of millet
grain in millet (see 6.2.1, 7.2.3);
- Modify the calculation formula for unsound kernels of rice (see 7.2.4; 7.2.6
of the 2008 edition);
- Delete the operation steps and calculation formulas for inspection of shelled
barnyard millet and rice grain (see 6.2.2, 7.2.4, 7.2.5 of the 2008 edition);
- ADD provisions for specification of sieve layer during operation (see
Appendix A).
This Standard was proposed by National Food and Strategic Reserves
Administration.
This Standard shall be under the jurisdiction of National Technical Committee
270 on Grain and Oils of Standardization Administration of China (SAC/TC 270).
Drafting organizations of this Standard: Henan Grain, Oil and Feed Products
Quality Supervision and Inspection Center, Standards and Quality Center of the
State Administration of Grain, Henan Food Science Research Institute Co., Ltd.,
Zhengzhou Food Science Institute, Liaoning Grain Reserves Co., Ltd., China
Grain Wuhan Scientific Research & Design Institute, Co., Ltd.
Main drafters of this Standard: Yin Chenghua, Sun Weiwei, Li Min, Zhang Yan,
Huang Changjun, Cui Yang, Hu Jipeng, Wang Lili, Chen Yin, Niu Mengyu.
The previous editions of the standard replaced by this Standard were released
as follows:
- GB/T 5494-1985, GB/T 5494-2008.
Inspection of grain and oils - Determination of foreign
matter and unsound kernels of grain and oilseeds
1 Scope
This Standard specifies the instruments and utensils, lighting requirements,
sample preparation, operation steps, and result calculation, etc. for the
determination of content of foreign matter and unsound kernels of grain and
oilseeds.
This Standard applies to the determination of content of foreign matter and
unsound kernels of grain and oilseeds.
2 Normative references
The following documents are indispensable for the application of this document.
For the dated references, only the editions with the dates indicated are
applicable to this document. For the undated references, the latest edition
(including all the amendments) are applicable to this document.
GB/T 5491 Inspection of grain and oilseeds - Methods for sampling and
sample reduction
GB/T 22505 Inspection of grain and oils - Sensory analysis environment -
Lighting
3 Instruments and utensils
3.1 Balance: Sensitivity is 0.01 g, 0.1 g, 1 g.
3.2 Grain sieve.
3.3 Electromagnetic sieve shaker.
3.4 Sample splitter or sample splitting plate.
3.5 Analysis tray, tweezers, etc.
The sieve automatically sieves to left and to right for 1 min respectively (110
r/min~120 r/min). After the sieve is stopped for a while, the oversize of the upper
sieve and the undersize of the lower sieve are respectively poured into the
analysis tray. The particles stuck in the middle of sieve pore belong to oversize.
6.1.1.2 Hand-sieve method: According to the method in 6.1.1.1, SET the sieve
layer; POUR the sample into it; COVER it with a sieve cover. Then PLACE the
sieve on a glass plate or a smooth tabletop; USE both hands, at a speed of 110
times/min~120 times/min, to sieve for 1 min in a clockwise direction and a
counter-clockwise direction respectively. The sieving range is controlled at
sieve diameter enlarged by 8 cm~10 cm. The operation after sieving is the same
as that in 6.1.1.1.
6.1.2 Inspection of foreign matter of large sample
From the average sample, according to the provisions of Clause 5, SPLIT and
take the sample to the large sample mass (m) specified in Table 1, accurate to
1 g. According to the sieving method specified in 6.1.1, the sieving is carried
out twice (Extra-large-grain and oil are sieved four times). Then the large foreign
matters on the upper sieve (The peeling grain kernel shell belongs to foreign
matter) are picked up and combined with the undersize of the lower sieve,
weighed (m1), accurate to 0.01 g.
6.1.3 Inspection of foreign matter of small sample
From the samples which have been inspected for foreign matter of large sample,
according to the provisions of Clause 5, SPLIT and take the sample to the small
sample mass (m2) specified in Table 1. When the small sample mass is not
more than 100 g, it is accurate to 0.01 g. When the small sample mass is more
than 100 g, it is accurate to 0.1 g. POUR it into the analysis tray; according to
the mass standards, PICK up foreign matters and weigh (m3), accurate to 0.01
g.
6.1.4 Mineral inspection
From the foreign matters of small sample picked, PICK up the minerals and
weigh (m4), accurate to 0.01 g.
6.1.5 Inspection of unsound kernels
While inspecting the foreign matter of small sample, according to the mass
standards, PICK up unsound kernels and weigh (m5), accurate to 0.01 g.
6.2 Inspection of foreign matter and unsound kernels of rice
6.2.1 Inspection of foreign matter
Where:
m5 - Mass of unsound kernels, in grams (g);
m2 - Small sample mass, in grams (g).
Under repeated conditions, the absolute difference between the two
independent determination results obtained: For large-grain and extra-large-
grain, it shall not exceed 1.0%; for small and medium-grain, it shall not exceed
0.5%. The average is obtained as the test result. The test result is retained to
one decimal place.
7.2 Calculation of inspection results of foreign matter and unsound
kernels of rice
7.2.1 The mineral or inorganic foreign matter content (w6) is expressed in mass
fraction (%) and is calculated according to formula (6):
Where:
m2′- Mineral or inorganic foreign matter mass, in grams (g);
m′ - Sample mass, in grams (g).
Under repeated conditions, the absolute difference between the two
independent determination results obtained shall not exceed 0.005%. The
average is obtained as the test result. The test result is retained to two decimal
places.
7.2.2 The total amount of foreign matter (w7) is expressed in mass fraction (%)
and is calculated according to formula (7):
Where:
m1′- Mass of rice bran powder, in grams (g);
m2′- Mineral or inorganic foreign matter mass, in grams (g);
m3′- Organic foreign matter mass, in grams (g);
m′ - Sample mass, in grams (g).
......
 
(Above excerpt was released on 2019-07-12, modified on 2021-06-07, translated/reviewed by: Wayne Zheng et al.)
Source: https://www.chinesestandard.net/PDF.aspx/GBT5494-2019