JJF 1643-2017 English PDF

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JJF 1643-2017: Program of Pattern Evaluation for Chemical Oxygen Demand(COD)Meters
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Basic data

Standard ID: JJF 1643-2017 (JJF1643-2017)
Description (Translated English): Program of Pattern Evaluation for Chemical Oxygen Demand(COD)Meters
Sector / Industry: Metrology & Measurement Industry Standard
Classification of Chinese Standard: A61
Word Count Estimation: 30,376
Date of Issue: 2017-09-26
Date of Implementation: 2017-12-26
Regulation (derived from): General Administration of State Quality Inspection Announcement 2017 No. 78
Issuing agency(ies): General Administration of Quality Supervision, Inspection and Quarantine

JJF 1643-2017: Program of Pattern Evaluation for Chemical Oxygen Demand(COD)Meters

---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.
(Chemical oxygen demand (COD) analyzer type evaluation outline) People's Republic of China National Measurement Specifications Chemical oxygen demand (COD) detector type evaluation outline Program of Pattern Evaluation for Chemical Oxygen Command (COD) Meters 2017-09-26 Posted 2017-12-26 Implementation General Administration of Quality Supervision, Inspection and Quarantine released Chemical oxygen demand (COD) detector Type evaluation outline Program of Pattern Evaluation ChemicalOxygenDemand (COD) Meters The focal point. National Environmental Chemistry Metering Technology Committee The main drafting unit. China Institute of Metrology Participate in the drafting unit. Shanghai Institute of Measurement and Testing Technology This specification entrusts the National Environmental Chemistry Metrology Technical Committee responsible for the interpretation The main drafters of this specification. Li Yunqiao (China Institute of Metrology) Participate in the drafters. Ding Min (Shanghai Institute of Measurement and Testing Technology) Ren Shuzhen (Shanghai Institute of Measurement and Testing Technology) Shi Hong (Shanghai Institute of Measurement and Testing Technology)

table of Contents

Introduction (Ⅱ) 1 Scope (1) 2 References (1) 3 Overview (1) 4 Legal Management Requirements (2) 4.1 Unit Requirements (2) 4.2 mark (2) 5 measurement requirements (2) 6 General technical requirements (2) 6.1 appearance and power check (2) 6.2 Supply voltage adaptability (2) 6.3 Climate Adaptability (3) 7 type evaluation item list (3) 8 to provide the number of prototypes and prototypes to use (4) 8.1 provide the number of prototypes (4) 8.2 prototype use (4) 9 Test methods and conditions of test items and data processing and acceptance criteria (4) 9.1 Legal Management Requirements (4) 9.2 Metering requirements (4) 9.3 General technical requirements (8) 9.4 Climate Adaptability (9) 10 Test items used in measuring instruments and equipment (11) 11 type evaluation results of the judgment and treatment (11) 12 Type Rating Original recording format (12) Appendix A Chemical oxygen demand model type evaluation Original recording format (13)

Introduction

This type evaluation outline based on JJF 1001 "common measurement terms and definitions", JJF 1016 "measuring instruments type Evaluation Outline Writing Guidelines "and JJF 1015" General Specification for Measurement Instruments, "prepared. The technical specifications of this type evaluation outline refer to the JJG975-2002 Chemical Oxygen Demand (COD) Tester, HJ828-2017 "Determination of chemical oxygen demand of water dichromate method", GB/T 11606-2007 "analyzer Environmental testing methods "and other technical regulations. This type of evaluation outline for the first time released. Chemical oxygen demand (COD) detector type evaluation outline

1 Scope

This type of evaluation program for dichromate chemical oxygen demand (COD) tester type evaluation.

2 reference documents

GB/T 6682 analytical laboratory water specifications and test methods For dated references, only the dated version applies to this specification; for undated references The latest version (including all amendments) applies to this specification.

3 Overview

Chemical oxygen demand is the number of oxidants consumed by oxidizing substances in water, The relative content of organic matter an important indicator, it is mainly used in petroleum, chemical, medical and health fields such as environmental monitoring. According to the principle of detection of chemical oxygen demand can be divided into two categories, one for the spectrophotometric principle (hereinafter referred to as A class) .That is under certain conditions, with a quantitative amount of potassium dichromate oxidation of water easily oxidized substances, hexavalent chromium Amount into trivalent chromium, the use of trivalent chromium absorption peak at 610nm or hexavalent chromium at 420nm absorption peak photometry Determination of COD content. This type of instrument by the digestion furnace and measuring part of the composition, the principle shown in Figure 1. Key components and See Table 1 for details. Figure 1 spectrophotometric principle schematic diagram of the instrument The other is the electrochemical principle (hereinafter referred to as the Class B) with a quantitative amount of potassium dichromate under certain conditions, heating After refluxing the sample, the ferrous ions produced by electrolysis react with the remaining hexavalent chromium. When the hexavalent chromium is consumed completely Electrolysis is over. According to the consumption of electricity conversion COD content. The principle shown in Figure 2. Figure 2 Electrochemical Principle schematic diagram of the instrument ......

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