ISO_NWIPs-for-Ballot

ISO/NP

— Purity

Quantitative nuclear magnetic resonance spectroscopy 40 determination of organic compounds used for foods and food 41 products — General requirements 42 1 Scope 43 This document provides general requirements for the measurement methods with quantitative nuclear 44 magnetic resonance (qNMR), using the nuclear species hydrogen ( 1 H), applied to purity determination 45 of organic compounds used for foods and food products. 46 This document is applicable to determine the purities of food-related substances such as food additives, 47 pesticides, natural toxins, and functional compounds. 48 This document provides general requirements and performance criteria for making the measurement 49 results to ensure to be SI traceable. 50 51 52 2 Normative references 53 The following documents are referred to in the text in such a way that some or all of their content 54 constitutes requirements of this document. For dated references, only the edition cited applies. For 55 undated references, the latest edition of the referenced document (including any amendments) applies. 56 ISO/IEC 17025, General requirements for the competence of testing and calibr tion laboratorie 57 ISO 17034, General requirements for the competence of reference material producers 58 OIML R111-1, 2004, Weights of classes E1, E2, F1, F2, M1, M1–2, M2, M2–3 and M3 ― Part 1: Metrological 59 and technical requirements 60 61 3 Terms and definitions 62 For the purposes of this document, the following terms and definitions apply. 63 ISO and IEC maintain terminological databases for use in standardization at the following addresses: 64 • ISO Online browsing platform: available at http://www.iso.org/ob 65 • IEC Electropedia: available at http://www.electropedia.org/ 66 3.1 67 nuclear magnetic resonance 68 NMR 69 physical phenomenon of absorption of radio frequency radiation and resonance of atomic nuclein a 70 static magnetic field. 71

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