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GB/T 5519-2018 PDF English

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GB/T 5519-2018: Cereals and pulses -- Determination of the mass of 1 000 grains
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GB/T 5519: Evolution and historical versions

Standard IDContents [version]USDSTEP2[PDF] deliveryName of Chinese StandardStatus
GB/T 5519-2018English165 Add to Cart 0-9 seconds. Auto-delivery Cereals and pulses -- Determination of the mass of 1 000 grains Valid
GB/T 5519-2008English199 Add to Cart 2 days Cereals and pulses -- Determination of the mass of 1000 grains Obsolete
GB/T 5519-1988English199 Add to Cart 2 days Cereals and oilseeds method for determination of the mass of 1000 grains Obsolete

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GB/T 5519-2018: Cereals and pulses -- Determination of the mass of 1 000 grains

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GB NATIONAL STANDARD OF THE PEOPLE’S REPUBLIC OF CHINA ICS 67.060 B 20 Replacing GB/T 5519-2008 Cereals and Pulses - Determination of the Mass of 1,000 Grains (ISO 520:2010, MOD) ISSUED ON: FEBRUARY 6, 2018 IMPLEMENTED ON: SEPTEMBER 1, 2018 Issued by: General Administration of Quality Supervision, Inspection and Quarantine of the People’s Republic of China; Standardization Administration of the People’s Republic of China.

Table of Contents

Foreword ... 3 1 Scope ... 5 2 Normative References ... 5 3 Terms and Definitions ... 5 4 Principle ... 5 5 Instruments and Appliances ... 6 6 Operating Procedures ... 6 7 Result Expression ... 6 8 Precision ... 7 9 Other Instructions on the Determination Process ... 9 Appendix A (informative) Interlaboratory Test Results ... 10 Bibliography ... 14 Cereals and Pulses - Determination of the Mass of 1,000 Grains

1 Scope

This Standard specifies the method for the determination of the mass of 1,000 grains of cereals and pulses. This Standard is applicable to all cereals and pulses. This Standard does not apply to seeds for sowing.

2 Normative References

The following documents are indispensable to the application of this document. In terms of references with a specified date, only versions with a specified date are applicable to this document. In terms of references without a specified date, the latest version (including all the modifications) is applicable to this document. GB/T 10362 Inspection of Grain and Oils - Determination of Moisture Content of Maize (GB/T 10362-2008, ISO 6540:1980, MOD) GB/T 21305 Cereals and Cereal Products - Determination of Moisture Content - Routine Reference Method (GB/T 21305-2007, ISO 712:1998, IDT) ISO 24557 Pulses - Determination of Moisture Content - Air-oven Method

3 Terms and Definitions

The following terms and definitions are applicable to this document. 3.1 mass of 1,000 grains as received The mass of 1,000 specimen grains containing natural moisture. 3.2 mass of 1,000 grains on the dry basis The mass of 1,000 specimen grains after deducting the moisture content.

4 Principle

Weigh and count the complete grains in the specimen, divide the mass of the complete grains by the number of grains, and express the result as the mass of 1,000 grains.

5 Instruments and Appliances

5.1 Sample splitter (if necessary). 5.2 Grain counter: a photoelectric counter can be used. If there is no suitable counter, it can be manually counted. 5.3 Balance: with a division value of 0.001 g.

6 Operating Procedures

6.1 Determination of Mass of 1,000 Grains as Received Randomly take out about 500 specimen grains from the laboratory sample, pick out the complete grains and weigh them (mt), accurate to 0.01 g; record the number of complete grains (N). Each sample shall be tested twice in parallel. 6.2 Determination of Mass of 1,000 Grains on the Dry Basis After removing impurities in the specimen, for cereals, in accordance with the stipulations of GB/T 21305 or GB/T 10362, determine the moisture content of the complete grains; for pulses, in accordance with the stipulations of ISO 24557, determine the moisture content (ωH2O) of the complete grains. Meanwhile, in accordance with 6.1, determine the mass of 1,000 grains.

7 Result Expression

7.1 The mass of 1,000 grains as received (m1) is obtained through Formula (1): Where, m1---the mass of 1,000 grains, expressed in (g); mt---the mass of complete grains, expressed in (g); N---the number of complete grains in the mass of mt. 7.2 The mass of 1,000 grains on the dry basis (m0) is obtained through Formula (2): Where, m0---the mass of 1,000 grains on the dry basis, expressed in (g); m1---the mass of 1,000 grains as received, expressed in (g); ωH2O---the moisture content of the sample, expressed in (%). 7.3 If the parallel determination results comply with the repeatability requirements (8.2), take the arithmetic mean as the result; otherwise, re-sampling is required for determination. The determination result of the mass of 1,000 grains is expressed in the unit of g. Significant digits are retained as follows: a) If the mass of 1,000 grains is less than 10 g, retain two digits after the decimal point; b) If the mass of 1,000 grains is equal to or greater than 10g but does not exceed 100 g, retain one digit after the decimal point; c) If the mass of 1,000 grains is greater than 100 g, take an integer.

8 Precision

8.1 Interlaboratory Test Details of the interlaboratory test precision of this Method are provided in Appendix A. For other data ranges and test objects, these test data are for reference only. 8.2 Repeatability The situation that the absolute difference between two independent test results obtained through mutually independent tests conducted in the same laboratory, by the same operator using the same equipment and the same test method, on the same test object in a short period of time is greater than the repeatability limit r shall not exceed 5%. The laboratory test results of wheat and barley whose mass of 1,000 grains on the dry basis is between 29.8 g ~ 48.2 g are shown in Table A.1, Table A.2 and Figure A.1. 8.3 Reproducibility The situation that the absolute difference between two independent test results obtained through mutually independent tests conducted in different laboratories, by different operators using different equipment and the same test method, on the same test object is greater than the reproducibility limit R shall not exceed 5%. ......
Source: Above contents are excerpted from the full-copy PDF -- translated/reviewed by: www.ChineseStandard.net / Wayne Zheng et al.


      

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