ISO 23637:2021
Cereals — Determination of cadmium content by graphite furnace atomic absorption spectrometry with diluted nitric acid extraction
This document specifies a method for the determination of cadmium (Cd) in cereals.
It is applicable to rice, brown rice, wheat and maize by graphite furnace atomic absorption spectrometry (GFAAS) after extraction with diluted nitric acid (HNO3). The limit of quantification is 0,002 mg/kg; it is approximate and dependent on the sample matrix as well as on the instrument conditions.
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Foreword
1 Scope
2 Normative references
3 Terms and definitions
4 Principle
5 Reagents and solution
6 Apparatus and equipment
7 Procedure
7.1 General
7.2 Sampling
7.3 Preparation of the test samples
7.4 Extraction
7.4.1 General
7.4.2 Reagent blank
7.5 Sample analysis
7.5.1 General
7.5.2 Operating conditions
7.5.3 Calibration graph
7.5.4 Determination
7.5.5 Application of matrix-modifier
7.6 Analytical quality control
8 Calculation
9 Precision
9.1 General
9.2 Repeatability
9.3 Reproducibility
9.4 Critical difference, D
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
10 Test report
Annex A (informative) Results of interlaboratory tests
Bibliography
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Foreword
1 Scope
2 Normative references
3 Terms and definitions
4 Principle
5 Reagents and solution
6 Apparatus and equipment
7 Procedure
7.1 General
7.2 Sampling
7.3 Preparation of the test samples
7.4 Extraction
7.4.1 General
7.4.2 Reagent blank
7.5 Sample analysis
7.5.1 General
7.5.2 Operating conditions
7.5.3 Calibration graph
7.5.4 Determination
7.5.5 Application of matrix-modifier
7.6 Analytical quality control
8 Calculation
9 Precision
9.1 General
9.2 Repeatability
9.3 Reproducibility
9.4 Critical difference, D
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
10 Test report
Annex A (informative) Results of interlaboratory tests
Bibliography