BS EN ISO 21424:2020
Milk, milk products, infant formula and adult nutritionals. Determination of minerals and trace elements. Inductively coupled plasma mass spectrometry (ICP-MS) method
| Standard number: | BS EN ISO 21424:2020 |
| Pages: | 40 |
| Released: | 2020-06-17 |
| ISBN: | 978 0 539 12731 7 |
| Status: | Standard |
BS EN ISO 21424:2020
This standard BS EN ISO 21424:2020 Milk, milk products, infant formula and adult nutritionals. Determination of minerals and trace elements. Inductively coupled plasma mass spectrometry (ICP-MS) method is classified in these ICS categories:
- 67.100.10 Milk and processed milk products
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.
The ranges given in Table 1 are in scope (see also Table A.1).
Table 1
Analytical ranges
| Ca | Cu | Fe | Mg | Mn | P | K | Na | Zn | Cr | Se | Mo | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Lower analytical rangea, in mg/100 g | 3 | 0,002 | 0,04 | 0,7 | 0,002 | 3 | 3 | 2 | 0,07 | 0,002 | 0,000 6 | 0,000 2 |
| Upper analytical rangea, in mg/100 g | 1 280 | 1,2 | 20 | 110 | 1,0 | 800 | 2 000 | 850 | 18 | 0,16 | 0,05 | 0,10 |
a Concentrations apply to
— milk and ”ready-to-feed” liquid as-is, using a typical sample size of 1 g per final analytical solution volume of 50 ml, and
— reconstituted milk powder, reconstituted infant formula powder and reconstituted adult nutritional powder (25 g into 200 g of water), using a typical sample size of 1,8 g of the reconstituted slurry per final analytical solution volume of 50 ml.
Ranges for non-reconstituted dairy ingredients (butter, cheese, whey powder, whey protein concentrate) are adjusted proportionally upward from these values based upon the sample size used for the ingredient. For example, if 0,3 g of cheese is digested the ranges will be 1 g/ 0,3 g = 3,3 × higher.