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Calibration Specification for Urea Analyzers of Water Sample Detection
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Basic data
| Standard ID | JJF 1822-2020 (JJF1822-2020) |
| Description (Translated English) | Calibration Specification for Urea Analyzers of Water Sample Detection |
| Sector / Industry | Metrology & Measurement Industry Standard |
| Classification of Chinese Standard | A60 |
| Classification of International Standard | 17.020 |
| Word Count Estimation | 16,177 |
| Date of Issue | 2020 |
| Date of Implementation | 2020-04-17 |
| Issuing agency(ies) | State Administration for Market Regulation |
JJF 1822-2020: Calibration Specification for Urea Analyzers of Water Sample Detection
---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.
Calibration Specification for Urea Analyzers of Water Sample Detection
National Measurement Technical Specification of the People's Republic of China
Calibration specification of urea detector for water sample detection
2020-01-17 release
2020-04-17 Implementation
Issued by the State Market Supervision Administration
Urea detector for water sample detection
Calibration specifications
Focal point. National Biometrics Technical Committee
Main drafting unit. Shanghai Institute of Measurement and Testing Technology
Participated in the drafting unit. China Academy of Metrology
This specification entrusts the National Biometrics Technical Committee to interpret
The main drafters of this specification.
Ding Min (Shanghai Institute of Metrology and Testing Technology)
Xu Qin (Shanghai Institute of Metrology and Testing Technology)
Participating drafters.
Gao Yunhua (Chinese Academy of Metrology)
Gang Liu (Shanghai Institute of Metrology and Testing Technology)
table of Contents
Introduction (Ⅱ)
1 Scope (1)
2 References (1)
3 Overview (1)
4 Measurement characteristics (1)
5 Calibration conditions (1)
5.1 Environmental conditions (1)
5.2 Standard materials, reagents and instruments for calibration (2)
6 Calibration items and calibration methods (2)
6.1 Stability (2)
6.2 Indication error (2)
6.3 Measurement repeatability (2)
7 Expression of calibration results (3)
8 Recalibration time interval (3)
Appendix A Method for preparing calibration standard solution (4)
Appendix B Reference Format for Calibration Record of Urea Tester (5)
Appendix C Examples of Uncertainty Evaluation of Indication Error Measurement Results (6)
Appendix D. Internal Format of Calibration Certificate (10)
Introduction
This specification is written in accordance with the requirements of JJF 1071-2010 "Rules for Compiling National Measurement and Calibration Specifications".
This specification refers to JJG179-1990 "filter photoelectric colorimeter" and JJF 1059.1-2012 "measurement uncertainty"
Degree evaluation and expression "formulation.
This specification is the first release.
Calibration specification of urea detector for water sample detection
1 Scope
This specification applies to the calibration of water sample urea detectors based on the principle of colorimetry.
2 Reference documents
JJF 1071-2010 Compilation Rules for National Measurement and Calibration Specifications
GB/T 6682-2008 Analytical laboratory water specifications and test methods
For dated reference documents, only the dated version applies to this specification; for those without date references
The latest version (including all amendments) is applicable to this specification.
3 Overview
The urea detector for water sample detection (hereinafter referred to as the instrument) uses the colorimetric principle to detect the urea content in the water sample
Measurement. The urea in the water sample reacts with the matching reagent to develop a color, and the degree of color development within a certain range is related to the urea in the tested sample.
The content is proportional, and the urea content of the sample is calculated according to the absorbance value of the coloring solution.
There are three main principles of color reaction.
The first is the diacetyl-oxime-antipyrine method. Under strong acid and heating conditions, urea and diacetyl-oxime-an
The reaction of tepirin is yellow, with a maximum absorption peak at a wavelength of about 460nm. The linear range of the method is (0.5 ~
10) mg/L.
The second is the sodium dichloroisocyanurate-thymol method, in the presence of soluble starch, urea can be combined with dichloroisocyanurate
The reaction of sodium urea and thymol produces a yellow compound with a maximum absorption wavelength of about 470nm. square
The normal linear range is (0.5 ~ 5) mg/L.
The third is the urease blue method. The ammonia nitrogen generated when urease hydrolyzes urea is used to neutralize sodium phenolate and secondary in a strong alkaline medium.
The sodium chlorate reacts to form a blue-green compound with a maximum absorption wavelength of about 610nm. The line of urea solution in this reaction
The sex range is (0.1 ~ 2.5) mg/L. In order to meet the needs of use, the detection range of urea can be reached through sample dilution
To (0.1 ~ 5) mg/L.
The instrument is mainly composed of light source, monochromator, sample room, detector, data processing, display unit and matching reagents, etc.
composition.
4 Measurement characteristics
4.1 Stability
4.2 Indication error
4.3 Measurement repeatability
5 Calibration conditions
5.1 Environmental conditions
...
