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JJG 1154-2018 English PDF

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JJG 1154-2018: Karl Fischer Volumetric Titrators for Water Content
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Basic data

Standard ID JJG 1154-2018 (JJG1154-2018)
Description (Translated English) Karl Fischer Volumetric Titrators for Water Content
Sector / Industry Metrology & Measurement Industry Standard
Classification of Chinese Standard A61
Word Count Estimation 14,172
Date of Issue 2018-06-25
Date of Implementation 2018-09-25
Regulation (derived from) State Administration of Markets, Announcement No. 13 of 2018
Issuing agency(ies) State Administration for Market Regulation

JJG 1154-2018: Karl Fischer Volumetric Titrators for Water Content

---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.
Karl Fischer Volumetric Titrators for Water Content National Metrology Verification Regulations of the People's Republic Karl Fischer Volumetric Moisture Analyzer Released on.2010-06-25 2018-09-25 implementation State Administration of Markets issued Karl Fischer Volumetric Method Moisture Tester verification procedure Focal Point. National Physical and Chemical Metrology Technical Committee Main drafting unit. China Institute of Metrology Participated in drafting unit. Shandong Institute of Metrology This procedure entrusts the National Physical and Chemical Metrology Technical Committee to explain The main drafters of this procedure. Wang Haifeng (China Institute of Metrology) Ma Kang (China Institute of Metrology) Li Zhanyuan (China Institute of Metrology) Participate in the drafters. Xu Aihua (Shandong Institute of Metrology)

table of Contents

Introduction (II) 1 Scope (1) 2 Overview (1) 3 Metrological performance requirements (1) 4 General technical requirements (2) 4.1 Legal measurement management signs and signs (2) 4.2 Appearance requirements (2) 4.3 routine inspection (2) 5 measuring instrument control (2) 5.1 Verification conditions (2) 5.2 Verification items and verification methods (2) 5.3 Processing of verification results (4) 5.4 Verification cycle (4) Appendix A Karl Fischer Volume Method Moisture Analyzer Verification Original Record Format (5) Appendix B Format of the certificate/certification result notice (7)

Introduction

This procedure is prepared in accordance with the requirements of JJF1002-2010 "Rules for the preparation of national metrological verification procedures". Regulation The process refers to GB/T 606-2003 "General method for chemical reagent moisture determination Karl Fischer method", GB/T 11133-2015 "Measurement of water content in petroleum products, lubricants and additives (Karl Fischer method)" and GB/T 6283-2008 "Determination of moisture content in chemical products by Karl Fischer method (general method)" Terms, symbols and definitions related to the Karl Fischer volumetric method, as well as technical requirements, technical indicators and test methods. This procedure is the first release. Karl Fischer Volumetric Method Moisture Analyzer Verification Procedure

1 Scope

This procedure applies to the first verification, subsequent verification and in-use inspection of the Karl Fischer volumetric moisture analyzer.

2 Overview

Karl Fischer Volumetric Moisture Analyzer (hereinafter referred to as the instrument) is mainly used to measure petroleum, chemical, pharmaceutical, The moisture content of products such as food and electricity. The basic principle of the Karl Fischer reaction is. in a non-aqueous solvent system Among them, iodine, sulfur dioxide and trace water were reacted in a ratio of 1.1.1 for the amount of the substance. See the formula (1) for the reaction formula. CH3OH SO2 I2 H2O 3RN=[RNH]SO4CH3 2[RNH]I (1) In the above reaction formula, CH3OH, SO2, I2, H2O and RN represent methanol, sulfur dioxide, iodine, respectively. Water and organic bases. The main components of the instrument include. titration cell, burette, indicating electrode, stirring system (including stirring) and Control System. The moisture content of the sample can be based on the titer and volume of the Karl Fischer titrant, as well as the sample The mass is calculated as shown in equation (2). x= T·V 1000·m×100% (2) In the formula. x---sample moisture content, %; T---the titer of the titrant, mg/mL; V---the volume of the titrant, mL; m---sample quality, g. Karl Fischer reagents are divided into one-component reagents and two-component reagents. One-component reagent (ie one-component titrant) contains There are iodine, sulfur dioxide, organic bases such as pyridine and methanol. When using a one-component reagent, methanol is usually used as a titration Solvent for dissolving the sample. Two-component reagents are divided into titrants and titration solvents. The titrant contains iodine, organic base and a Alcohol; the titration solvent contains sulfur dioxide, an organic base, and methanol for dissolution of the sample.

3 Metrological performance requirements

The metering performance requirements of the instrument are shown in Table 1. Table 1 Instrument metrology performance requirements Verification project metrology performance requirements Moisture content indication maximum allowable error ± 7% Moisture content repeatability does not exceed 3%

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