TI_GB5490-2010 Inspection of Grain and Oils - General Rules

8/11/2019 TI_GB5490-2010 Inspection of Grain and Oils - General Rules

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Regional Economic Cooperation and Integration in Asia

Technical Inputs

National Standard of Peoples Republic of China

GB/T 5490-2010

Inspection of grain and oils General rules


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Imprint

Published by the

Deutsche Gesellschaft fr

Internationale Zusammenarbeit (GIZ) GmbH

Registered offices

Bonn and Eschborn, Germany


China Office

TaYuan Diplomatic Office

14 Liangmahe South Street, Chaoyang District

10600 Beijing, PR China

T +86-10-8532-5344

F +86-10-8532-5744

Office Mongolia

Naiman Zovkhi Building

Seoul Street 21Ulaanbaatar 14251, Mongolia

[email protected]

www.giz.de

As at

September 2014

Photo credits

Copyrights for all pictures: GIZ

Copyright for cover picture: GIZ/Ursula Meissner

Text

Shenzhen Institute of Standards and Technology (SIST), Shenzhen, PR China

The findings and conclusions expressed in this documentation are entirely those of the authors. They do not necessarily repre-

sent the view of the Deutsche Gesellschaft fr Internationale Zusammenarbeit (GIZ) or further organising parties. The informa-

tion provided is without warranty of any kind.

On behalf of the German Federal Ministry for Economic Cooperation and Development (BMZ)


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ICS 67.040

X 04

Natioal Stadard of Peoples Repuli of Chia

GB/T 5490-2010

Replaces GB/T 5490-1985

Inspection of grain and oilsGeneral rules

Issue Date: June 30, 2010 Implementation Date: January 1, 2011

Issued by General Adiistratio of Quality Supervisio, Ispetio ad Quaratie of the Peoples

Repuli of Chia AQSIQ ad Stadardizatio Adiistratio of the Peoples Repuli of Chia

(SAC)


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1

Foreword

This standard replaces the GB/T 5490-1985 Inspection of Grain, Oil Seeds and Vegetables Oils

General Rules.

Compare with GB/T 5490-1985, the major changes of this standard are listed as follows:

--- Add terms and definitions, choices of inspection methods, apparatuss requirement, and

inspection requirement related to inspection of grain and oils;

--- Supplement the arbitration method;

--- Revise and supplement the inspection result calculation;

--- Cite the corresponding national standard to replace the Annex A error and data processing

and Annex B preparation and calibration of several standard solutionsof original standard;

--- Change the general procedures of inspection of grain and oils, describe the inspection

procedures of grain and oils and their products respectively according to the type of grain and

items of inspection, and include such description into informative annex.

Annex B of this standard is normative Annex; Annex A of this standard is informative Annex.

This standard is proposed by State Administration of Grain.

This standard is under jurisdiction of the National Standardization Technical Committee of Grain

and Oils.

The main organizations that participated in the drafting of this standard are: Standards &

Quality Center of the State Administration of Grain, Henan University of Technology, Sichuan

Province Industry and Trade School, Nanjing University of Finance & Economics, Heilongjiang

Province Grain and Oils Quality Inspection Station, Hubei Province Grain and Oils Quality

Inspection Station, China Grain Reserves Corporation Jilin Branch, Chengdu Institute of Grain

Storage Science, Beijing Institute of Food Science.

The major drafters of this standard are: Tang Ruiming, Zhang Yurong, Zhou Xianqing, Zhou

Zicheng, Yuan Jian, Song Xiujuan, Xiong Ning, Gu Xiangming, Bing Yongjin, Yang Zhengyao, Gao

Yanna, Yang Haoran, Zheng Jiafeng, Zhou Zhanming.

The past published version which is replaced is listed as follows:

--- GB/T 5490-1985


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GB/T 54902010

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Inspection of grain and oilsGeneral rules

1 Scope

This standard specifies terms and definitions, samples registration, samples requirements,

selection of inspection methods, reagents requirements, apparatuss requirements, originalrecord and inspection sheet as well as results calculation and processing related to quality

inspection of grain, oils and products.

This standard is applicable to quality inspection of grain, oils and products.

2 Normative references

The following standards contain provisions which, referred by this standard, constitute

provisions of this standard. For dated references, only the edition cited applies. For undated

references, the latest edition of the referenced document (including any amendments) applies.

However, it is encouraged for each party entering agreement according to this standard to

decide whether to use the latest versions of these documents. In addition, the latest versions of

all reference documents without dates are applicable to the standard.

GB/T 601 Chemical reagent Preparations of standard volumetric solutions

GB/T 602 Chemical reagent Preparations of standard solutions for impurity

GB/T 603 Chemical reagent Preparations of reagent and products for use in test methods

GB/T 8170 Rules of rounding off for numerical values & expression and judgment of limiting

values

3 Terms and definitions

The following terms and definitions are applicable to this standard.

3.1

Sample

Few material object that can represent the quality of tested grain and oils. The samples can be

divided into increment, aggregate sample, submitted sample (laboratory sample), and

experiment sample.

3.2

Increment


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Few samples that sample from sampling unit of the tested grain and oils using specified

sampling tools according to specified method.

3.3

Aggregate sample

Sample that aggregates and mixes all the increment together according to the specified

representative quantity.

3.4

Submitted sample

Laboratory sample

Sample that fully mixes the aggregate samples and is split into certain amount by using sampling

tool according to specified method and then is sent to laboratory

3.5

Retention sample

Sample that is the same as the submitted sample or experiment sample which is obtained from

the splitting sample, backup for verification, recheck and unexpected circumstances.

3.6

Experiment sample

Sample that is used for laboratory inspection and prepared according to specified method.

3.7

Parallel test

Operation, starting from sample reduction of laboratory samples or sample weighing of

experiment samples after preparation, which uses the same analytical procedure, apparatus,

and reagent in order to acquire mutual independence of the test result

3.8

Blank test

Adopt the same analytical procedure, apparatus, and reagent operation as the experiment

sample test except adding experiment sample. The result is used to deduct the background of

experiment sample and calculate detection limit of the test method.

3.9


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GB/T 54902010

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9 Inspection requirements

9.1 Conduct inspection according to the specified analytical procedure in the standard.

9.1.1 Weigh: use scale to weigh, and its accuracy is expressed by numerical significant digit. For

example: weigh 20.0 gmeans that the accuracy is 0.1 g; weigh 20.00 gmeans that

the accuracy is 0.01 g.

9.1.2 Accurate weight: Use scale to weigh and its accuracy is 0.0001 g.

9.1.3 Constant weight: Under specified conditions, the discrepancy of weight should not exceed

the specified scope after the sample is dried or burnt twice.

9.1.4 Measure: Use measuring cylinder or measuring glass to get the liquid substance.

9.1.5 Absorb: Use transfer pipette, measuring pipet to get the liquid substance.

9.2 In order to reduce random errors, parallel test should be conducted so that mutualindependent estimated value can be acquired and thereby reliable final test result could be

acquired.

9.3 Blank test should be conducted when there is background for the test and the detection

limit of the test method needs to be calculated.

9.4 Recovery test should be conducted to judge whether there is systematic error in the analytic

procedure and to verify the reliability and accuracy of the test method.

9.5 Protective measures should be taken for the possible insecurity factor (such as poisoning,

explosion, corrosion and burning) in the inspection.

9.6 For the quality inspection procedure of the main grain and oils, see Annex A.

10 Original record and inspection sheet

10.1 Complete original record should be kept in the experiment sample inspection. Original

record should be original, authentic and traceable.

10.2 Original record should include (but not limited to): sample number, sample name (category,

variety), inspection criteria, inspection item, inspection method, environment temperature,

humidity, major (name, type, number), test data, computational formula and result, inspector,

checker, inspection date.

10.3 Inspector should fill in the quality inspection sheet in accordance with the original record.


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11 Results calculation and handling

11.1 Calculation of estimated value and the rounding of valid figures should be in accordance

with GB/T 8170.

11.2 Final test result

11.2.1 Under the condition of repeatability, compare the absolute difference of two

independent test results with the allowable difference specified in the standard (repeatability

limit r=2.8*Sr), if the absolute difference of these two test results is not more than allowable

difference, then take the average value of the two independent test result as the final test result.

11.2.2 If the absolute difference of two independent test results is greater than the allowable

difference, then two more independent tests should be conducted, and there will be four

independent test results. If the range (Xmax-Xmin) of the four independent test results is equal to

or less than 1.3 times of the allowable difference [or repetitive critical range CrR95(4)=3.6*Sr],

then take the average value of the four independent test results as the final test result; If therange (Xmax-Xmin) of the four independent test results is greater than 1.3 times of the allowable

difference [or repetitive critical range CrR95(4)=3.6*Sr], then take the median of the four

independent test results as the final test result.

11.2.3 When more than two independent tests are required by the standard, the repetitive

critical range CrR95(n) is calculated according to Annex B and the final test result is determined

according to 11.2.1 and 11.2.2.

11.3 Non-detected could be used to describe the test result if the test result is under the

detection limit but its detection limit value should be noted.

11.4 The test report should include (but not limited to) the following contents:

--- Final test result, and the test number should be stated, whether the test result is the average

value or median;

--- All the information of the sample;

--- Sampling method (if known);

--- All the operation details which might influence the result and which are not specifically

described in the standard or are not considered to be optional.


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Annex A

(Informative Annex)

Quality inspection procedure of grain and oils

A. 1 Inspection procedure of paddy

Figure A.1 Inspection procedure of paddy

See Figure A.1


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A.2 Inspection procedure of wheat and corn

See Figure A.2.

Figure A.2 Inspection procedure of wheat and corn


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A. 3 Inspection procedure of soybean See Figure A.3

Figure A.3 Inspection procedure of soybean

content

IncrementAggregate

Sample

Retention

Sample

OthersStorage

Quality

Experiment

Sample

Retention

Sample

Laboratory

Sample

MoistureNutritional

Ingredient

Color and

Lustre,

Smell

Bulk

Sample

Impurity

SkinColor

Perfect

sample

Protein

solubilit

y ratio

Fatty acidvalue

Damage

Sample

Hand Sample

Impurity

Nutrition

Facts

Crude fatCrude

proteinColor and

Lustre,

Smell

odour

odour

Big

foreign

matter

Small

foreign

matter


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A.4 Inspection procedure of rice

See figure A.4

Figure A.4 Inspection procedure of rice


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A.5 Inspection procedure of wheat flour

See figure A.5

Figure A.5 Inspection procedure of wheat flour


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Annex B

(Informative annex)

Calculation of repeatability critical range

Repeatability critical range is calculated according to formula (B.1):

..(B.1)

Where:

After n times of independent test under the condition of repeatability, the

repetitive critical range when the probability is 95%.

testing times

critical range coefficient, the critical range coefficient of different

independent testing times refers to Table B.1.

Srrepeatability standard difference.

Table B.1Critical range coefficient


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TI_GB5490-2010 Inspection of Grain and Oils - General Rules

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