GB/T 41752-2022 English PDF

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GB/T 41752-2022: Gas analysis - Investigation and treatment of analytical bias
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Basic data

Standard ID: GB/T 41752-2022 (GB/T41752-2022)
Description (Translated English): Gas analysis - Investigation and treatment of analytical bias
Sector / Industry: National Standard (Recommended)
Classification of Chinese Standard: G86
Classification of International Standard: 71.100.20
Word Count Estimation: 31,328
Date of Issue: 2022-10-12
Date of Implementation: 2022-10-12
Issuing agency(ies): State Administration for Market Regulation, China National Standardization Administration

GB/T 41752-2022: Gas analysis - Investigation and treatment of analytical bias

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Gas analysis - Investigation and treatment of analytical bias ICS 71.100.20 CCSG86 National Standards of People's Republic of China Research and Treatment of Analytical Bias in Gas Analysis (ISO 15796.2005, MOD) Released on 2022-10-12 2022-10-12 Implementation State Administration for Market Regulation Released by the National Standardization Management Committee

table of contents

Preface III Introduction IV 1 Scope 1 2 Normative references 1 3 Terms and Definitions 1 4 symbols 2 5 Bias related to instrument drift3 5.1 Principle 3 5.2 Stability monitoring 3 5.3 Drift Correction 5 6 Bias due to sample composition 8 6.1 General 8 6.2 Dealing with local bias9 6.3 Bias treatment beyond the specified measurement range 17 7 Treatment of matrix interference 21 7.1 General 21 7.2 Example A 21 7.3 Example B 21 7.4 Example C 21 Appendix A (Normative) Key Values for Trend Testing 22 Appendix B (Informative) Uncertainty Question 23 B.1 Interpretation of correlations between repeated measures23 B.2 Accounting for uncorrected bias24 Reference 25 Table 1 Drift control data sorted by time6 Table 2 Correction coefficient difference 7 Table 3 Recommended bias correction measures8 Key values for the statistical trend test in Table A.1 5.2.3 22

foreword

This document is in accordance with the provisions of GB/T 1.1-2020 "Guidelines for Standardization Work Part 1.Structure and Drafting Rules for Standardization Documents" drafting. This document is modified to adopt ISO 15796.2005 "Research and Treatment of Analysis Bias in Gas Analysis". Compared with ISO 15796.2005, this document has made the following structural adjustments. --- A chapter on normative references has been added; --- Adjust the symbol descriptions in 5.2.1.1 and 5.2.2.1 to Chapter 4. The technical differences between this document and ISO 15796.2005 and their reasons are as follows. ---Change the angle brackets (such as < x >) representing the average value in the text to an overscore (such as x), because the overscore is common in our country The symbolic expression of the average value of ; ---Change the term "traceability" to "measurement traceability", the term "traceability" comes from the term in the old version of VIM --- Change "d >2u[d]" in "multiplicative drift correction" to "d≤2u[d]" (see 5.3.3), here is the errata; --- Changed the formula (32) (see 6.2.3.3), here is the errata; --- Changed the formula (39) (see 6.3.4), here is the errata. Please note that some contents of this document may refer to patents. The issuing agency of this document assumes no responsibility for identifying patents. This document is proposed by China Petroleum and Chemical Industry Federation. This document is under the jurisdiction of the National Gas Standardization Technical Committee (SAC/TC206). This document is drafted by. Institute of Chemistry, China Academy of Testing Technology, Southwest Branch of Haohua Gas Co., Ltd., PetroChina Natural Gas Co., Ltd. Planning Institute, PetroChina Southwest Oil and Gas Field Branch Natural Gas Research Institute, State Grid Jiangxi Province Electric Power Research Institute of Electric Power Co., Ltd., Xiamen Metrology Inspection and Testing Institute, Jincheng Comprehensive Inspection and Testing Center, China Metrology Research Institute, Chengdu University of Technology, Chongqing Institute of Metrology and Quality Inspection, China Environmental Monitoring Station, Sichuan University, Southwest Chemical Research and Design Institute have Co., Ltd., Sichuan Zhongce Marking Technology Co., Ltd., Sichuan Kaile Testing Technology Co., Ltd., Anhui Dahang Technology Co., Ltd. The main drafters of this document. Yang Jiawei, Wang Bin, Li Zhiang, Dai Yan, Huang, Chen Yali, Wang Weikang, Yuan Fang, Zhou Li, Zhang Ting, Li Xiaohong, Liu Ping, Dong Xuan, Wang Qiang, Wang Defa, Xu Shuxia, Xu Yang, Hu Delong, Tan Li, Yang Jing, Li Chenghui, Deng Fanfeng, Wang Xianjian, Xiong Huajing, Yang Sentao, Deng Wenqing, Tan Yiling, He Wei.

Introduction

Metrological traceability is key to quality assurance in gas analysis. Metrological traceability usually refers to uninterrupted calibration through documentation Chain, the property that links a measurement result to a measurement reference standard. If a measurement proves to be insignificant through an uninterrupted chain of comparisons Significant bias means that the measurement result has metrological traceability within the specified uncertainty range. Metrological traceability through having a clear measurement It is reflected in the analytical procedure of the amount concentration range and matrix composition, rather than the result of a single measurement. Measurement of relevant components by an analytical procedure has been traced If it can be shown that the measurement results are not biased, or the bias has been corrected, then the analytical procedure can be regarded as having a representative sample of the source. traceability. A representative sample can be a reference gas mixture or a specific sample measured in parallel using a reference analytical procedure. "Bias" is an estimate of what we usually call "systematic error". "Systematic error" together with "random error" constitutes measurement error. "Systematic error" means that component of measurement error that remains constant or varies in a predictable manner across repeated measurements, and is generally determined by imperfections in the analytical procedure. It is easy to introduce, and correction compensation can be used for known system errors. ISO 15796 gives the common types of "bias" in gas analysis respectively Corresponding research and processing methods have been proposed, which has a significant guiding role for workers in the field of gas analysis. In this document, the term "concentration" has two meanings. --- As a general term in gas composition analysis, replace the term "content" (see ISO 7504 [4]); --- As a general alternative term for a specific analyte in gas composition analysis, such as. the mass concentration or mole fraction of a specific analyte (see ISO 7504[4]). Research and Treatment of Analytical Bias in Gas Analysis

1 Scope

This document describes the analysis and correction of bias (systematic error) in gas analysis procedures using a reference gas mixture or a reference analysis procedure. difference), and a general method for assessing the uncertainty of the corrected value. The main sources of (and contributors to) analytical procedure bias are instrument drift and matrix interferences, which typically vary with analyte concentration. Therefore, this document describes the following two methods. --- Drift analysis and correction of analytical systems with limited stability; ---For a stable analysis system with determined gas sample composition, its bias can be used in subsequent method development and analysis after research and mastery used in method validation studies. This document establishes two procedures applicable to the analysis of system effects. a) retrospectively model observed deviations and correct their effects; b) Averaging system effects and expanding uncertainties. Usually, the first procedure requires more work, but can obtain smaller uncertainties. For ease of use, the methods described in this document are all used to analyze gas composition procedures, for example, the concentration of a specific analyte in a mixed gas measurement procedure. These methods are equally applicable to the measurement of physical or chemical properties of pure or mixed gases in relation to gas analysis.

2 Normative references

The contents of the following documents constitute the essential provisions of this document through normative references in the text. Among them, dated references For documents, only the version corresponding to the date is applicable to this document; for undated reference documents, the latest version (including all amendments) is applicable to this document. GB/T 6379.3 Accuracy of measurement methods and results (trueness and precision) Part 3.Standard measurement method precision Intermediate measurement (GB/T 6379.3-2012, ISO 5725-3.1994, IDT) GB/T 10628 Determination and verification comparison method of gas analysis and calibration gas mixture composition (GB/T 10628-2008, ISO 6143.2001, IDT) GB/T 27418-2017 Evaluation and Expression of Measurement Uncertainty (ISO /IEC Guide98-3.2008, MOD)

3 Terms and Definitions

The following terms and definitions apply to this document. 3.1 bias An estimate of the systematic error. Note. Since the true value of the measurand cannot be known exactly, the systematic error cannot be accurately measured and can only be estimated using reference values. 3.2 correction The procedure for making adjustments to uncorrected measurements to compensate for systematic errors. Note 1 to entry. A procedure for adjusting uncorrected measurements to compensate for systematic errors. Since the systematic error cannot be fully known, this compensation does not completely. Note 2.In ISO /IEC Guide99 [5], the meaning of this term is different. ......

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