JJG 548-2018 English PDF

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JJG 548-2018: Mercury Analyzers
Status: Valid

JJG 548: Historical versions

Standard ID	USD	BUY PDF	Lead-Days	Standard Title (Description)	Status
JJG 548-2018	369	Add to Cart	4 days	Mercury Analyzers	Valid
JJG 548-2004	599	Add to Cart	3 days	Verification Regulation of Mercury Analyzers	Obsolete
JJG 548-1988	319	Add to Cart	3 days	Verification Regulation of cold Atomic Fluorometer For Determination of Mercury	Obsolete

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Basic data

Standard ID: JJG 548-2018 (JJG548-2018)
Description (Translated English): Mercury Analyzers
Sector / Industry: Metrology & Measurement Industry Standard
Classification of Chinese Standard: A61
Word Count Estimation: 16,124
Date of Issue: 2018-06-25
Date of Implementation: 2018-12-25
Older Standard (superseded by this standard): JJG 548-2004
Regulation (derived from): State Administration of Markets, Announcement No. 13 of 2018
Issuing agency(ies): State Administration for Market Regulation

JJG 548-2018: Mercury Analyzers

---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.
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 Scope (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 ......

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