GB/T 5493-2008Inspection of grain and oils - Determination of type purity and their mixture (English PDF)

Foreword

This Standard replaces GB/T 5493-1985, Inspection of grain and oilseeds - Methods for determination of varieties and their mixture.

The main technical differences between this Standard and GB/T 5493-1985 are as follows.

-- Add the inspection method of mixture of grains of different types;

-- Add lighting requirements during inspection operations;

-- Modify the inspection method of mixture of indica rice, japonica rice and glutinous rice and the identification test method of wheat grain color;

-- Modify the content of grain dissecting inspection.

1 Scope

This Standard specifies the reagents, instruments and utensils, lighting requirements, operating procedures and result calculations for grain and oil varieties and their mixture.

This Standard applies to the determination of mixture of grains and oils of the same type and different grain forms, grain natures, and grain colors, as well as the inspection of mixture of different types of grain and oils.

2 Normative references

The terms in the following documents become the terms of this Standard by reference to this Standard. For dated references, all subsequent amendments (not including errata content) or revisions do not apply to this standard. However, parties to agreements that are based on this Standard are encouraged to study whether the latest versions of these documents can be used. For undated references, the latest edition applies to this Standard.

GB 1350, Paddy

GB 1351, Wheat

GB 1354, Milled rice

3 Reagents

0.1% iodine-ethanol solution.

4 Instruments and utensils

5 Lighting requirements

The lighting conditions during operation shall meet the requirements of GB/T 22505.

6 Operation procedures

7 Result calculations

7.1 Calculation of mixing ratio of indica rice, japonica rice and glutinous rice Calculate the mixing ratio of indica rice, japonica rice and glutinous rice according to Formula (1).