GB/T 5511-2008 English PDF

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GB/T 5511-2008: Cereals and pulses -- Determination of the nitrogen content and calculation of the crude protein content -- Kjeldahl method
Status: Obsolete

GB/T 5511: Historical versions

Standard ID	USD	BUY PDF	Lead-Days	Standard Title (Description)	Status
GB/T 5511-2008	559	Add to Cart	3 days	Cereals and pulses -- Determination of the nitrogen content and calculation of the crude protein content -- Kjeldahl method	Obsolete
GB/T 5511-1985	199	Add to Cart	2 days	Inspection of grain and oilseeds--Methods for determination of crude protein	Obsolete

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Basic data

Standard ID: GB/T 5511-2008 (GB/T5511-2008)
Description (Translated English): Cereals and pulses -- Determination of the nitrogen content and calculation of the crude protein content -- Kjeldahl method
Sector / Industry: National Standard (Recommended)
Classification of Chinese Standard: X10
Classification of International Standard: 67.040
Word Count Estimation: 14,117
Date of Issue: 2008-08-22
Date of Implementation: 2008-12-01
Older Standard (superseded by this standard): GB/T 5511-1985
Quoted Standard: GB/T 10362; GB/T 21305
Adopted Standard: ISO 20483-2006, IDT
Regulation (derived from): National Standard Approval Announcement 2008 No.14 (Total No.127)
Issuing agency(ies): General Administration of Quality Supervision, Inspection and Quarantine of the People's Republic of China, Standardization Administration of the People's Republic of China
Summary: This standard specifies the determination of grain by the Kjeldahl method, calculation method for the determination of nitrogen in legumes and derived products and the content of crude protein content. This method can not distinguish between protein nitrogen and non-protein nitrogen. If the determination of non-protein nitrogen content is very important, you can use other suitable methods.

GB/T 5511-2008: Cereals and pulses -- Determination of the nitrogen content and calculation of the crude protein content -- Kjeldahl method

---This is a DRAFT version for illustration, not a final translation. Full copy of true-PDF in English version (including equations, symbols, images, flow-chart, tables, and figures etc.) will be manually/carefully translated upon your order.
Cereals and pulses. Determination of the nitrogen content and calculation of the crude protein content. Kjeldahl method ICS 67.040 X10 National Standards of People's Republic of China GB/T 5511-2008/ISO 20483.2006 Replacing GB/T 5511-1985 Cereals and legumes and nitrogen content The crude protein content calculated Kjeldahl method (ISO 20483.2006, IDT) Posted 2008-08-22 2008-12-01 implementation Administration of Quality Supervision, Inspection and Quarantine of People's Republic of China Standardization Administration of China released

Foreword

This standard is equivalent to international standard ISO 20483.2006 "Determination of cereals and legumes nitrogen content and crude protein content calculated Kay S Law. " For ease of use, the standard ISO 20483.2006 includes the following editorial changes. --- "This International Standard" be replaced by "this standard"; "." --- With a decimal point instead of a comma as the decimal point, ""; --- Delete foreword international standards; --- The referenced file ISO 712 replace the current national standard GB/T 21305, ISO 6540 replace GB/T 10362. This standard is GB/T 5511-1985 "grain and oilseeds crude protein assay test" amendments. The main changes compared to 5511-1985 standard and GB/T as follows. --- Increased by principle, normative references, terms and definitions, for sampling, sample preparation, water content determination, precision and test reports. Since the implementation date of this standard instead of GB/T 5511-1985. The Standard Appendix A, Appendix B and Appendix C are informative appendices. The standard proposed by the National Food Authority. This standard by the National Standardization Technical Committee OILS. This standard was drafted. State Administration of Grain Science Institute. The main drafters. Zhang Jiaxin, Hao Xicheng, Wu Chunhua. This standard superseded standard previously issued as follows. --- GB/T 5511-1985. GB/T 5511-2008/ISO 20483.2006 Cereals and legumes and nitrogen content The crude protein content calculated Kjeldahl method Warning. Use of this standard may involve hazardous materials, operations and equipment. Intent of this standard is not a statement of the use of the standard All security-related issues before using this standard, the standard user to establish appropriate safety measures and restrictions specified applications.

1 Scope

This standard specifies the determination of the calculation of cereals, legumes and derived products Determination of nitrogen content and crude protein content by the Kjeldahl method method. This method can not distinguish between protein nitrogen and non-protein nitrogen. If the determination of non-protein nitrogen content is very important, you can use other suitable Methods. NOTE. Under certain circumstances, the use of this method for the determination of nitrate and nitrite nitrogen can not achieve complete recovery.

2 Normative references

The following documents contain provisions which, through reference in this standard and become the standard terms. For dated references, subsequent Amendments (not including errata content) or revisions do not apply to this standard, however, encourage the parties to the agreement are based on research Whether the latest versions of these documents. For undated reference documents, the latest versions apply to this standard. GB/T 10362 maize water assay (GB/T 10362-1989, eqv ISO 6540. 1980) GB/T 21305 Cereals and cereal products - Determination of moisture conventional method (GB/T 21305-2007, ISO 712.1998, IDT)

3 Terms and Definitions

The following terms and definitions apply to this standard. 3.1 Application procedures specified in this standard measured nitrogen content. Note. The dry matter content expressed. 3.2 The application of this standard procedure prescribed measured by multiplying the nitrogen content of different protein conversion factor of grain or beans to give crude protein content. Note. The dry matter content expressed. Principle 4 Sample in the presence of a catalyst with sulfuric acid digestion, the reaction product with a base and after distillation. The ammonia released is absorbed by boric acid solution, the liquid absorbent Sulfuric acid solution titration, Determination of nitrogen content and calculation of crude protein content.

5 Reagents

In addition to reference materials, the use of nitrogen-free only confirmed analytical reagents, test water is distilled or deionized water or equivalent purity water. Warning. Reagents and 5.12 5.4,5.8,5.11 mentioned should be used with caution. 5.1 potassium sulfate (K2SO4). 5.2 copper sulfate pentahydrate (CuSO4 · 5H2O). GB/T 5511-2008/ISO 20483.2006 ......

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