BS ISO 15151:2018 pdf download

BS ISO 15151:2018 pdf download.Milk, milk products, infant formula and adult nutritionals — Determination of minerals and trace elements — Inductively coupled plasma atomic emission spectrometry (ICP-AES) method
1 Scope
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) and zinc (Zn) using inductively coupled plasma atomic emission spectrometry (ICP-AES). The method is applicable for milk, dried milk, butter, cheese, whey, dried whey, infant formula and adult nutritional formula in the ranges given in Table 1.
2 Normative references
The following documents are referred to in the text in such a way that some or all of their content constitutes requirements of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies.
ISO 648, Laboratory glassware — Single-volume pipettes
ISO 1042, Laboratory glassware — One-mark volumetric flasks
ISO 3696, Water for analytical laboratory use — Specification and test methods
3 Terms and definitions
No terms and definitions are listed in this document.
ISO and IEC maintain terminological databases for use in standardization at the following addresses:
— ISO Online browsing platform: available at https://www.iso.org/obp
— IEC Electropedia: available at http://www.electropedia.org/
4 Principle
The organic matter is decomposed by wet digestion using nitric acid in a pressurized microwave assisted wet digestion system or any other appropriate instrumentation for wet digestion and diluted. An internal standard is used. The test and calibration solutions are atomized into plasma of an inductively coupled plasma spectrometer and the emission is measured at appropriate wavelengths using external calibration.
5 Reagents
WARNING — The use of this document can involve hazardous materials, operations and reagents.This document does not propose to address all the safety problems associated with its use. It is the responsibility of the user of this document to establish safety and health practices.
Use only reagents of recognized analytical grade, unless otherwise specified.
5.1 Water, complying with ISO 3696, grade 2, unless otherwise stated.
5.2 Nitric acid (HNO 3 ), concentrated, with a mass fraction of 65 %.
5.3 Nitric acid solution (HNO 3 ), 10 % volume fraction. Add one part of HNO 3 (5.2) to seven parts of water and mix.
5.4 Element stock solutions of Ca, P, K (each of mass concentration ρ = 10 000 mg/l) and Cu, Fe, Mg,Mn, Na, Zn (each of ρ = 1 000 mg/l).
Use a suitable element stock solution, preferably a certified one. Both single-element stock solutions and multi-element stock solutions with an adequate specification, stating the acid used (mostly being nitric acid) and the preparation technique, are commercially available. Do not use the element stock solution after the expiry date.