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Guidance of quantifying measurement uncertainty in chemical analysis
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Basic data | Standard ID | RB/T 030-2020 (RB/T030-2020) | | Description (Translated English) | Guidance of quantifying measurement uncertainty in chemical analysis | | Sector / Industry | Chinese Industry Standard (Recommended) | | Classification of Chinese Standard | A00 | | Classification of International Standard | 03.120.20 | | Word Count Estimation | 102,150 | | Date of Issue | 2020-08-26 | | Date of Implementation | 2020-12-01 | | Regulation (derived from) | National Certification and Accreditation Administration Announcement No. 21 of 2020 | | Issuing agency(ies) | National Certification and Accreditation Administration | RB/T 030-2020: Guidance of quantifying measurement uncertainty in chemical analysis---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.
(Guidelines for the Evaluation of Measurement Uncertainty in Chemical Analysis)
ICS 03.120.20
A00
The People's Republic of China Certification and Accreditation Industry Standard
Guidelines for Evaluation of Measurement Uncertainty in Chemical Analysis
2020-08-26 released
2020-12-01 implementation
Issued by the National Certification and Accreditation Administration Committee
Table of contents
Foreword Ⅲ
Introduction Ⅳ
1 Scope 1
2 Normative references 1
3 Terms and definitions 1
4 Evaluation process of measurement uncertainty 4
5 Provision to be measured 5
6 Identify sources of uncertainty 5
6.1 Create Listing 5
6.2 Model expression 5
6.3 Typical sources of uncertainty 6
7 Quantification of uncertainty 6
7.1 Summary 6
7.2 Evaluation steps of uncertainty 7
7.3 Uncertainty Evaluation Method 7
7.4 Utilize existing data to assess uncertainty 7
7.5 Uncertainty assessment of individual components 11
7.6 Judgment of the significance of bias 12
8 Calculation of synthetic uncertainty 12
8.1 Standard uncertainty 12
8.2 Uncertainty of composite standard 13
8.3 Expanded uncertainty 14
9 Reporting of Uncertainty Evaluation Results 15
9.1 General 15
9.2 Content requirements 16
9.3 Report standard uncertainty 16
9.4 Reporting the expanded uncertainty 16
9.5 Numerical representation of results 16
9.6 Asymmetric interval 17
9.7 Compliance with regulatory limits 17
Appendix A
(Informative appendix) Example 18
Appendix B
(Informative appendix) Uncertainty in the analysis process 70
Appendix C
(Informative appendix) Sources of analysis uncertainty 72
Appendix D
(Informative appendix) Relevant statistical procedures 75
Appendix E
(Informative appendix) Measurement uncertainty of detection limit/quantity limit 89
Appendix F
(Informative appendix) Common sources and values of uncertainty 93
References 97
Foreword
This standard is in accordance with GB/T
Drafting of the rules given in 1.1-2009.
This standard was proposed and managed by the National Certification and Accreditation Administration Committee.
Drafting organizations of this standard. China National Accreditation Center for Conformity Assessment, Shenzhen Customs (formerly Shenzhen Entry-Exit Inspection and Quarantine Bureau), Guangdong Testing
Institute of Analysis (China Guangzhou Analysis and Testing Center), National Meat Food Quality Supervision and Inspection Center.
The main drafters of this standard. Huo Jianglian, Yang Yaowu, Zhang Mingxia, Wang Shanshan, Dong Fuyin, Mou Dehai, Zhang Youwen, Xu Heng, Zhou Yali, Wang Le,
Bai Qinghua, Liu Wei, Yu Jing, Wang Yang, Zhou Sixu, Guo Wenping.
Introduction
In chemical quantitative analysis, when making a decision based on the analysis result, you must fully understand the quality of the analysis result itself, that is, according to the purpose of use.
Confirm the reliability of the analysis results. In the field of chemical analysis, usually based on ISO /IEC
17025 laboratory accreditation to establish measurement results
The traceability of measurement.
With the development of testing theory and the accumulation of practice, measurement uncertainty has gradually become an important factor in proving the reliability of testing results.
Metric parameters.
The revision of this standard adopts the combination of the European Association for Analytical Chemistry EURACHEM and the International Cooperative Organization for Analytical Chemistry
Quantifying the Uncertainty in Analytical Measurement (Quantifying
Uncertainty
in
Analytical
Measurement) third edition, root
According to the practical experience of the chemical laboratory in the evaluation of measurement uncertainty, the laboratory’s procedures for evaluating the measurement uncertainty are combined with the existing quality assurance
Combining measures, and adding cutting-edge information in the evaluation and use of uncertainty since.2000, and the uncertainty when the measurement result is close to zero.
The expression of certainty and the application of Monte Carlo simulation method to evaluate the uncertainty, complete the chemical analysis with measurement uncertainty
Guidelines for judging the conformity of results.
Guidelines for Evaluation of Measurement Uncertainty in Chemical Analysis
1 Scope
This standard provides general guidelines for evaluating and reporting measurement uncertainty in quantitative chemical analysis, including source analysis, model establishment, and
Quantification of certainty and reporting of uncertainty.
This standard applies to all accuracy levels and all measurement fields including daily analysis, basic research, empirical methods, etc.
2 Normative references
The following documents are indispensable for the application of this document. For dated reference documents, only the dated version applies to this article
Pieces. For undated reference documents, the latest version (including all amendments) is applicable to this document.
GB/T
3358.2 Statistics Vocabulary and Symbols Part 2.Applied Statistics
GB/T
6379.1 Accuracy of measurement methods and results (accuracy and precision) Part 1.General principles and definitions
GB/T
27025 General requirements for the competence of testing and calibration laboratories
GB/T
27418-2017 Evaluation and expression of measurement uncertainty
(ISO
Guide
98-3.2008, MOD)
ISO /IEC
Guide
99.2007 The basic and general concepts and related terms of international metrology terminology (International
vocabulary
of
metrology-Basic
and
general
concepts
and
associated
terms) (VIM for short)
3 Terms and definitions
ISO /IEC
Guide
99.2007, GB/T
3358.2 and GB/T
The following terms and definitions defined in 6379.1 apply to this
file.
3.1
Precision
Under the specified conditions, the same or similar measured objects are repeatedly measured to obtain the displayed value or the degree of agreement between the measured values.
[ISO /IEC
Guide
99.2007, definition 2.15]
Note 1.
The measurement precision is only related to the degree of dispersion of random errors, and has nothing to do with the true value or the specified value.
Note 2.
The measurement precision is usually expressed by the standard deviation of the test results. The larger the standard deviation, the worse the precision.
Note 3.
"Independent measurement results" means that the measurement results obtained are not affected by any previous measurement results of the same or similar objects. Repeatability and reproducibility
Conditions are a set of specially specified extreme conditions.
3.2
True
value
The quantity value consistent with the definition of quantity.
[ISO /IEC
Guide
99.2007, definition 2.11]
Note 1.
Truth value is a theoretical concept, usually unknowable.
Note 2.
The quantity can be a basic quantity, such as quality, length, time, or a "derived quantity", such as speed (length/time).
3.3
Influence
quantity
In direct measurement, it does not affect the actual measured quantity, but will affect the relationship between the displayed value and the measurement result.
[ISO /IEC
Guide
99.2007, definition 2.52]
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