JJF 1855-2020 English PDF

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JJF 1855-2020: Metrological Technical Specification for Purity Assessment of Certified Reference Materials - Organic Purity Certified Reference Materials
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Basic data

Standard ID: JJF 1855-2020 (JJF1855-2020)
Description (Translated English): Metrological Technical Specification for Purity Assessment of Certified Reference Materials - Organic Purity Certified Reference Materials
Sector / Industry: Metrology & Measurement Industry Standard
Classification of Chinese Standard: A66
Word Count Estimation: 21,282
Date of Issue: 2020-09-11
Date of Implementation: 2021-03-11
Regulation (derived from): Announcement No. 40 (2020) of the State Administration for Market Regulation
Issuing agency(ies): State Administration for Market Regulation

JJF 1855-2020: Metrological Technical Specification for Purity Assessment of Certified Reference Materials - Organic Purity Certified Reference Materials

---This is a DRAFT version for illustration, not a final translation. Full copy of true-PDF in English version (including equations, symbols, images, flow-chart, tables, and figures etc.) will be manually/carefully translated upon your order.
Metrological Technical Specification for Purity Assessment of Certified Reference Materials - Organic Purity Certified Reference Materials National Metrology Technical Specifications of the People's Republic of China Technical specification for fixed value measurement of purity standard material Organic Purity Standards 2020-09-11 released 2021-03-11 implementation Issued by the State Administration for Market Regulation Technical specification for fixed value measurement of purity standard material Organic Purity Standards Focal point. National Technical Committee for Standard Material Measurement Main drafting unit. China Institute of Metrology Participated in the drafting unit. Institute of Materia Medica, Chinese Academy of Medical Sciences This specification is interpreted by the National Technical Committee for Reference Material Measurement The main drafters of this specification. Li Hongmei (China Institute of Metrology) Huang Ting (China Institute of Metrology) Zhang Wei (China Institute of Metrology) Participating drafters. Lu Yang (Institute of Materia Medica, Chinese Academy of Medical Sciences) Yang Shiying (Institute of Materia Medica, Chinese Academy of Medical Sciences)

table of Contents

Introduction (Ⅱ) 1 scope (1) 2 Reference documents (1) 3 Term (1) 3.1 Organic purity (1) 3.2 Mass balance method (1) 3.3 Quantitative nuclear magnetic resonance method (1) 3.4 Thermal analysis method (1) 4 General requirements (1) 4.1 Screening of candidate reference materials (1) 4.2 Qualitative analysis of reference materials (1) 4.3 Principles for the selection of purity determination methods (2) 5 Classification, principles and requirements of valuation methods (2) 5.1 Mass balance method (2) 5.2 Quantitative nuclear magnetic resonance method (2) 5.3 Thermal analysis method (3) 5.4 Coulomb method (3) 5.5 Titration (3) 5.6 Density method (4) 5.7 Molecular spectroscopy (external standard correction method) (4) 6 Evaluation of fixed value and uncertainty (4) 6.1 Mass balance method (4) 6.2 Quantitative nuclear magnetic resonance method (12) 6.3 Thermal analysis method (12) 6.4 The combination of fixed value results and uncertainty (14) 6.5 Uncertainty of uniformity and stability (15) 6.6 Uncertainty of composite standard (15) 6.7 Expanded uncertainty (15) 7 Description of Metrological Traceability (15) 7.1 General requirements (15) 7.2 Specific method requirements (15)

Introduction

The organic purity standard material is an important part of the standard material, and it is the source calibration for the measurement of complex matrix organic matter standard. This specification is based on the "International Union of Pure and Applied Chemistry Technical Report on Organic Purity-Purity of Organic Compounds" Established on the basis of "SI Valuation Method" to standardize my country's organic purity standards The fixed value of the substance. This specification is released for the first time. Technical specification for fixed value measurement of purity standard material Organic Purity Standards

1 Scope

This specification is applicable to guide homogeneous organic matter with a clear molecular structure (usually relative molecular mass < 5000) The determination of purity of the product and the development of its purity standard material.

2 Reference documents

JJF 1005 General terms and definitions of reference materials JJF 1343 General Principles and Statistical Principles of the Value of Reference Materials Selection and application of JJF 1507 reference materials The Organic Purity Technical Report of the International Union of Pure and Applied Chemistry---SI Determining the Purity of Organic Compounds For dated reference documents, only the dated version applies to this specification; for undated reference documents, The latest version (including all amendments) is applicable to this specification.

3 term

The following terms and definitions defined by JJF 1005 apply to this specification. 3.1 Organic purity The content of the main component in the organic compound. Usually expressed in mass fraction (g/g) and its multiples, referred to as purity. 3.2 Mass balance method Under the premise that the total mass fraction of the tested substance is 100%, by deducting the content of all impurity components, The method to obtain the content of the main ingredient, that is, the purity. 3.3 Quantitative NMR method Based on the proportional relationship between the integral area of the signal in the nuclear magnetic resonance spectrum and the number of nuclei that produce the corresponding resonance spectrum It is a method for determining the purity of a substance. 3.4 Thermal analysis method According to the relationship between the melting point of the substance and the purity, based on the van't Hoff equation, the method of calculating the purity of the substance.

4 General requirements

4.1 Screening of reference material candidates Under the premise of reasonable cost, samples with relatively high purity, good uniformity and stability should be selected, which can be Commercial, customized or reprocessed samples. ......

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