ISO 23637:2021 PDF

Name: ISO 23637:2021 — Cereals — Determination of cadmium content by graphite furnace atomic absorption spectrometry with diluted nitric acid extraction
SKU: ISO 23637:2021
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Cereals — Determination of cadmium content by graphite furnace atomic absorption spectrometry with diluted nitric acid extraction

Название (английский):

ISO 23637:2021

Cereals — Determination of cadmium content by graphite furnace atomic absorption spectrometry with diluted nitric acid extraction

Статус документа:: Действующий
Формат:: Электронный (PDF)
Количество страниц:: 10
Дата публикации:: 15 декабря 2021 г.
Издание:: ISO IS 23637 edition 1 version 1
ICS:: 67.060

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Описание (английский):

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.

Abstract

Похожие стандарты

Стандарты, упомянутые в описании

Overview

ISO 23637:2021 specifies a validated laboratory method for the determination of cadmium (Cd) in cereals (rice, brown rice, wheat and maize) by graphite furnace atomic absorption spectrometry (GFAAS) after extraction with diluted nitric acid (HNO3). The method includes sample preparation, extraction, GFAAS measurement (228.8 nm), calibration and quality control. The approximate limit of quantification (LOQ) is 0.002 mg/kg, dependent on matrix and instrument conditions.

Key topics and technical requirements

Scope and matrices: Applicable to rice, brown rice, wheat and maize. Sampling itself is outside the method but ISO 24333 is recommended for rice sampling.

Sample preparation: Grinding to specified particle sizes (maize ≤ 0.25 mm; other cereals ≤ 0.40 mm) and homogenous mixing.

Test portion and extraction: Typical test portion 0.200 g ±0.001 g extracted with 5.0 mL diluted HNO3; centrifuge or stand to obtain supernatant.

Instrumentation: GFAAS with graphite furnace, autosampler and background correction (e.g., Zeeman). Cadmium hollow cathode lamp at 228.8 nm.

Calibration: Use external calibration solutions (recommended range ~0.4–2.0 µg/L) and at least four calibration points; linearity check required.

Matrix modifier: Palladium nitrate (Pd(NO3)2) 100 mg/L recommended as matrix modifier; typically add 5 µL during injection to reduce matrix interferences.

Quality control and calculation: Analyze certified reference materials (CRM/RM) each run; results calculated to mass fraction (mg/kg) using blank-corrected concentrations and expressed to two significant figures.

Precision data: Repeatability and reproducibility characteristics are provided (with formulae) based on interlaboratory studies and ISO precision guidance.

Applications and users

Food safety and public health laboratories monitoring cadmium in cereals and cereal products.

Regulatory authorities enforcing maximum levels and import/export compliance.

Commercial testing and contract laboratories providing contaminant screening for processors and retailers.

Agricultural researchers and cereal processors assessing cadmium uptake, mitigation and quality control.

Related standards

ISO 3696 - Water for analytical laboratory use (grade 1 water).

ISO 24333 - Recommended sampling for rice (sampling guidance).

ISO 5725 series - Methods for determining precision (repeatability and reproducibility) of measurement methods.

ISO 23637:2021 is a practical, instrument-based standard for reliable cadmium quantification in cereals using GFAAS with diluted nitric acid extraction - key for compliance testing, risk assessment and food safety monitoring.

ISO 23637:2021 PDF

Abstract

Похожие стандарты

Overview

Key topics and technical requirements

Applications and users

Related standards

Технические детали

SIST EN ISO 24333:2010/AC:2010

Cereals and cereal products - Sampling (ISO 24333:2009)

SIST EN ISO 3696:1998

Water for analytical laboratory use - Specification and test methods (ISO 3696:1987)

ISO 5725-6:1994/Cor 1:2001

Accuracy (trueness and precision) of measurement methods and results — Part 6: Use in practice of accuracy va…