GB/T 31578-2015 English PDF

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GB/T 31578-2015: Inspection of grain and oils -- Determination of crude proteia content in grain and its products -- Combustion method according to the Dumas prunple
Status: Valid

Standard ID	USD	BUY PDF	Lead-Days	Standard Title (Description)	Status
GB/T 31578-2015	399	Add to Cart	4 days	Inspection of grain and oils -- Determination of crude proteia content in grain and its products -- Combustion method according to the Dumas prunple	Valid

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Basic data

Standard ID: GB/T 31578-2015 (GB/T31578-2015)
Description (Translated English): Inspection of grain and oils -- Determination of crude proteia content in grain and its products -- Combustion method according to the Dumas prunple
Sector / Industry: National Standard (Recommended)
Classification of Chinese Standard: X10
Classification of International Standard: 67.040
Word Count Estimation: 19,112
Date of Issue: 2015-05-15
Date of Implementation: 2015-11-23
Quoted Standard: GB/T 10362; GB/T 21305; ISO 24333; ISO 24557
Adopted Standard: ISO/TS 16634-2-2009, MOD
Regulation (derived from): National Standard Announcement 2015 No. 15
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 use of the Dumas combustion method for the determination of cereals, legumes and product terms and definitions in the total nitrogen content and crude protein content, principle, reagents, instruments and equipment, sampling, sample preparation, test procedures, the results of calculation and representation, precision and test reports. This Standard applies to cereals, legumes and products measured in the crude protein content.

GB/T 31578-2015: Inspection of grain and oils -- Determination of crude proteia content in grain and its products -- Combustion method according to the Dumas prunple

---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.
Inspection of grain and oils. Determination of crude proteia content in grain and its products. Combustion method according to the Dumas prunple ICS 67.040 X10 National Standards of People's Republic of China Inspection of grain and grain products and crude protein determination Dumas combustion method (ISO /T S16634-2.2009, Foodproducts-Determinationofthetotalnitrogen Part 2. Cereals, pulsesandmiledcerealproducts, MOD) Issued on. 2015-11-23 2015-05-15 implementation Administration of Quality Supervision, Inspection and Quarantine of People's Republic of China Standardization Administration of China released

Foreword

This standard was drafted in accordance with GB/T 1.1-2009 given rules. This revised standard adopts ISO /T S16634-2.2009 "Food Dumas combustion method for the determination of total nitrogen content and calculation of crude protein in which Content Part 2. Cereals, pulses and milled cereal products "(in English). This standard and ISO /T S16634-2. Compared to 2009, the main differences are as follows. --- On normative references, this standard has been adjusted technical differences are reflected in Chapter 2, "normative references" The specific adjustments are as follows. • Modify with international standards of GB/T 10362, instead of the ISO 6540; • equivalents adoption of international standards GB/T 21305, instead of ISO 712. --- Remove the 6.5 Dumas azotometer footnote. The standard proposed by the National Food Authority. This standard by the National Grain and Oil Standardization Technical Committee (SAC/TC270) centralized. This standard was drafted. Academy of State Grain Bureau, Beijing Branch of China Star Electronics Co., Ltd. The main drafters of this standard. Lin Jiayong, Fanwei Yan, Sun Hui, Jiang Weili, Yang Yun, Zhouchen Wei. Inspection of grain and grain products and crude protein determination Dumas combustion method

1 Scope

This standard specifies the determination using the Dumas combustion method cereals, beans and products in the total nitrogen content and crude protein content of terms and definitions, the original Li, reagents, instruments and equipment, sampling, sample preparation, test procedures, the results of calculation and representation, precision and test reports. This standard applies to cereals, legumes and determination of the crude protein content of the products.

2 Normative references

The following documents for the application of this document is essential. For dated references, only the dated version suitable for use herein Member. For undated references, the latest edition (including any amendments) applies to this document. GB/T 10362 Inspection of grain and corn determination of moisture content (GB/T 10362-2008, ISO 6540. 1980, MOD) GB/T 21305 Cereals and cereal products - Determination of moisture conventional method (GB/T 21305-2007, ISO 712.1998, IDT) ISO 24333 Cereals and cereal products sampled (Cerealsandcerealproducts-Sampling) ISO 24557 Determination of moisture content of beans oven method (Pulses-Determinationofmoisturecontent-Air- ovenmethod)

3 Terms and Definitions

The following terms and definitions apply to this document. 3.1 The total nitrogen content totalnitrogencontent Under the conditions specified in this standard, the sample was measured nitrogen content, expressed as a percentage by mass. 3.2 The crude protein content crudeproteincontent The total nitrogen content (3.1) multiplied by a conversion factor obtained by mass percentage. Note. This method uses a conversion factor with Kjeldahl same, but slightly different method for the determination of the results of the Kjeldahl method. Principle 4 The samples were heated in the combustion tube into a gas after combustion, wherein the nitrogen-containing material is converted to molecular nitrogen, interfering gases being sucked series absorbers Income removed. Molecular nitrogen by thermal conductivity detector to obtain nitrogen content.

5 Reagents

The agents of the criteria used were of analytical grade or reagent with the same purity specified by the instrument manufacturer. In addition to the standard substance (5.12), the various reagents used must not contain nitrogen. 5.1 Carrier gas. Depending on the type of instrument can be used in 5.1.1 or 5.1.2 one carrier gas. ......

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