ISO 16624:2020
Wheat flour and durum wheat semolina — Determination of colour by diffuse reflectance colorimetry
This document specifies a method for the determination of colour in durum wheat semolina and wheat flour by diffuse reflectance colorimetry.
It is applicable to industrial semolina and flour.
The method can be applicable to flour obtained from experimental mill.
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Foreword
1 Scope
2 Normative references
3 Terms and definitions
4 Principle
5 Apparatus
6 Sample preparation
7 Procedure
7.1 General
7.2 Setting of the colorimeter
7.3 Colorimetric determination
8 Expression of the results
9 Precision
9.1 General
9.2 Repeatability limit, r
9.3 Reproducibility limit, R
9.4 Critical difference, dC
9.4.1 General
9.4.2 Comparison of two groups of measurements in one laboratory
9.4.3 Comparison of two groups of measurements in two laboratories
9.5 Uncertainty, U
10 Test report
Annex A (informative) Results of the interlaboratory test
Bibliography
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Foreword
1 Scope
2 Normative references
3 Terms and definitions
4 Principle
5 Apparatus
6 Sample preparation
7 Procedure
7.1 General
7.2 Setting of the colorimeter
7.3 Colorimetric determination
8 Expression of the results
9 Precision
9.1 General
9.2 Repeatability limit, r
9.3 Reproducibility limit, R
9.4 Critical difference, dC
9.4.1 General
9.4.2 Comparison of two groups of measurements in one laboratory
9.4.3 Comparison of two groups of measurements in two laboratories
9.5 Uncertainty, U
10 Test report
Annex A (informative) Results of the interlaboratory test
Bibliography