ISO 21424:2018 PDF

Milk, milk products, infant formula and adult nutritionals — Determination of minerals and trace elements — Inductively coupled plasma mass spectrometry (ICP-MS) method

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Title (English):

ISO 21424:2018

Milk, milk products, infant formula and adult nutritionals — Determination of minerals and trace elements — Inductively coupled plasma mass spectrometry (ICP-MS) method

Document status:: Active
Format:: Electronic (PDF)
Number of pages:: 31
Publication date:: November 12, 2018
Edition:: ISO IS 21424 edition 1 version 1
ICS:: 67.100.10

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Description (English):

This document specifies a method for the quantitative determination of calcium (Ca), copper (Cu), iron (Fe), magnesium (Mg), manganese (Mn), phosphorus (P), potassium (K), sodium (Na), zinc (Zn), chromium (Cr), molybdenum (Mo) and selenium (Se) using inductively coupled plasma and mass spectrometry (ICP-MS). The method is applicable for the determination of all 12 elements in infant formula and adult nutritional products. The method is also applicable for milk, milk powder, whey powder, butter and cheese excluding the determination of Cr, because all Cr results were below the quantification limit and reproducibility could not be determined in these matrices[1]. The present method is an extension of ISO 20649 | IDF 235 (AOAC 2011.19[2]) which was validated only for Cr, Mo and Se in infant formula and adult nutritional products.

Technical details

Technical committee: ISO/TC 34/SC 5 - Milk and milk products
SKU: ISO 21424:2018

Abstract

Overview

ISO 21424:2018 specifies an ICP‑MS method for the quantitative determination of minerals and trace elements in milk, milk products, infant formula and adult nutritionals. The method covers 12 elements - Ca, Cu, Fe, Mg, Mn, P, K, Na, Zn, Cr, Mo and Se - and is designed for simultaneous, high‑sensitivity analysis using inductively coupled plasma mass spectrometry (ICP‑MS). The procedure includes microwave digestion, matrix matching, internal standards and collision/reaction gas modes to reduce interferences and improve accuracy.

Key Topics and Technical Requirements

Scope and matrices: Applicable to all 12 elements in infant formula and adult nutritional products. Also applicable to milk, milk powder, whey powder, butter and cheese - excluding Cr in those dairy matrices because Cr results were below quantification limits and reproducibility could not be determined.
Elements analysed: Calcium, copper, iron, magnesium, manganese, phosphorus, potassium, sodium, zinc, chromium, molybdenum and selenium.
Sample preparation: Microwave digestion at 200 °C using nitric acid with added hydrogen peroxide to reduce carbon/nitrous oxide in digestate.
Matrix matching: Methanol is added to both standards and digestates to account for carbon‑related signal enhancement (notably for Se).
Internal standards: Germanium (Ge) for most elements and Tellurium (Te) specifically for Se.
Interference control: Use of helium collision mode with kinetic energy discrimination (KED) to reduce polyatomic interferences; hydrogen gas mode recommended for improved sensitivity for Se.
Calibration and detector modes: Attention to pulse/analogue (P/A) factor tuning and achieving linear calibration residuals (e.g.,

Related standards

Other ISO standards

Overview

Key Topics and Technical Requirements

Scope and matrices: Applicable to all 12 elements in infant formula and adult nutritional products. Also applicable to milk, milk powder, whey powder, butter and cheese - excluding Cr in those dairy matrices because Cr results were below quantification limits and reproducibility could not be determined.
Elements analysed: Calcium, copper, iron, magnesium, manganese, phosphorus, potassium, sodium, zinc, chromium, molybdenum and selenium.
Sample preparation: Microwave digestion at 200 °C using nitric acid with added hydrogen peroxide to reduce carbon/nitrous oxide in digestate.
Matrix matching: Methanol is added to both standards and digestates to account for carbon‑related signal enhancement (notably for Se).
Internal standards: Germanium (Ge) for most elements and Tellurium (Te) specifically for Se.
Interference control: Use of helium collision mode with kinetic energy discrimination (KED) to reduce polyatomic interferences; hydrogen gas mode recommended for improved sensitivity for Se.
Calibration and detector modes: Attention to pulse/analogue (P/A) factor tuning and achieving linear calibration residuals (e.g.,

ISO 21424:2018 PDF

Technical details

Abstract

Overview

Key Topics and Technical Requirements

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Abstract

Overview

Key Topics and Technical Requirements

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