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JJG 548-2018

Chinese Standard: 'JJG 548-2018'
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JJG 548-2018English279 Add to Cart Days<=4 Mercury Analyzers Valid JJG 548-2018
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BASIC DATA
Standard ID JJG 548-2018 (JJG548-2018)
Description (Translated English) Mercury Analyzers
Sector / Industry Metrology & Measurement Industry Standard
Word Count Estimation 16,116
Date of Issue 2018-06-25
Date of Implementation 2018-12-25
Older Standard (superseded by this standard) JJG 548-2004
Drafting Organization Shanghai Metrology and Testing Technology Research Institute, China Institute of Metrology
Administrative Organization National Environmental Chemometrics Technical Committee
Regulation (derived from) State Administration of Markets, Announcement No. 13 of 2018
Issuing agency(ies) State market supervision and administration

JJG 548-2018
Mercury Analyzers
National Metrology Verification Regulations of the People's Republic
Mercury meter
Published on.2018-06-25
2018-12-25 implementation
State Administration of Markets issued
Mercury meter verification procedure
Replace JJG 548-2004
Focal Point. National Environmental Chemometrics Technical Committee
Drafting unit. Shanghai Institute of Metrology and Testing Technology
China Institute of Metrology
This procedure entrusts the National Environmental Chemometrics Technical Committee to explain
The main drafters of this procedure.
Ding Min (Shanghai Institute of Metrology and Testing Technology)
Ma Liandi (China Institute of Metrology)
Gu Yuran (Shanghai Institute of Metrology and Testing Technology)
Participate in the drafters.
Cui Yanjie (China Institute of Metrology)
Hua Zhenning (Shanghai Institute of Metrology and Testing Technology)
table of Contents
Introduction (II)
1 range (1)
2 References (1)
3 Overview (1)
4 Metrological performance requirements (2)
5 General technical requirements (2)
5.1 Appearance (2)
5.2 Insulation resistance (2)
6 measuring instrument control (2)
6.1 Verification conditions (2)
6.2 Verification project (2)
6.3 Verification method (3)
7 Processing of verification results (4)
8 verification period (4)
Appendix A Preparation Methods and Examples of Standard Solutions (5)
Appendix B Mercury meter verification record format (7)
Appendix C Format of verification certificate/verification result notice page (9)
introduction
This procedure is a revision of the JJG 548-2004 Mercury Analyzer. Compared with JJG 548-2004 Mercury Analyzer
In addition to editorial changes, the main technical changes are as follows.
--- The scope of the qualification procedure is a mercury analyzer for determining the mercury content of a liquid sample (see 1);
--- The unit of detection limit is modified to quality unit;
--- Revise the requirements for standard solutions used in linearity and repeatability assays (see 6.3.3,
6.3.5);
--- Revise the linear error, detection limit and repeatability of the verification method, does not limit the mercury reduction method (see 6.3.3,
6.3.4, 6.3.5);
--- Amendment Appendix A is "the preparation method and examples of standard solutions";
--- Delete the appendix of "Calculation of Slope and Intercept in Linear Regression" in the original procedure.
The previous versions of this procedure were released as follows.
---JJG 548-2004;
---JJG 548-1988;
---JJG 679-1990.
Mercury meter verification procedure
1 Scope
This procedure applies to the cold atomic absorption of mercury in liquid samples and the first inspection of cold atomic fluorescence mercury detectors.
Determination, follow-up verification and in-use inspection.
2 reference files
GB/T 6682 Analytical laboratory water specifications and experimental methods
For dated references, only the dated version applies to this Code; any undated quotation
The latest version (including all amendments) applies to this procedure.
3 Overview
Mercury meter (hereinafter referred to as instrument) is mainly used for water, atmosphere, soil, minerals, food, cosmetics and biology.
Determination of trace mercury in the sample.
Mercury analyzer is divided into cold atomic absorption mercury detector (hereinafter referred to as absorption instrument) and cold atomic fluorescence according to the detection principle.
Mercury meter (hereinafter referred to as fluorescent instrument).
The principle of the absorption instrument is based on the absorption of mercury atoms in the sample by a low-pressure mercury lamp with a wavelength of 253.7 nm.
The spectral line, whose absorbance meets the Lambert-Beer law within a certain range, thereby quantitatively determining
The mercury content of the sample.
The principle of a fluorescent instrument is based on the fact that the ground-state mercury atoms in the sample are emitted by a low-pressure mercury lamp at a wavelength of 253.7 nm.
The characteristic line is excited to a high energy state, and when it returns to the ground state, the fluorescence is radiated, and within a certain range, the fluorescence intensity and the mercury concentration
In a linear relationship, the mercury content of the sample is quantitatively determined.
Absorption instruments are mainly composed of light source, absorption cell, detector and data processing and display unit.
The structure is shown in Figure 1.
Figure 1 Schematic diagram of the main structure of the cold atomic absorption mercury analyzer
Fluorescent instruments are mainly composed of light source, concentrating system, fluorescent cell, detector and data processing and display unit.
Cheng, the main structure of the instrument is shown in Figure 2.
Figure 2 Schematic diagram of the main structure of the cold atomic fluorescence mercury detector
Related standard: JJG 657-2019    JJG 672-2018
Related PDF sample: JJG 631-2013    JJG 714-2012