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JJG 1012-2019 English PDF

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JJG 1012-2019: On-line Automatic Determinators of Chemical Oxygen Demand (COD)
Status: Valid

JJG 1012: Evolution and historical versions

Standard IDContents [version]USDSTEP2[PDF] delivered inStandard Title (Description)StatusPDF
JJG 1012-2019English329 Add to Cart 3 days [Need to translate] On-line Automatic Determinators of Chemical Oxygen Demand (COD) Valid JJG 1012-2019
JJG 1012-2006English479 Add to Cart 3 days [Need to translate] Verification regulation of on-line automatic determination of chemical oxygen demand (COD) Obsolete JJG 1012-2006
JJG 1012-1987EnglishRFQ ASK 3 days [Need to translate] General Terms for Humidity Measurement Obsolete JJG 1012-1987

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Basic data

Standard ID JJG 1012-2019 (JJG1012-2019)
Description (Translated English) On-line Automatic Determinators of Chemical Oxygen Demand (COD)
Sector / Industry Metrology & Measurement Industry Standard
Classification of Chinese Standard A61
Classification of International Standard 17.020
Word Count Estimation 14,121
Date of Issue 2019
Date of Implementation 2020-03-31
Issuing agency(ies) State Administration for Market Regulation

JJG 1012-2019: On-line Automatic Determinators of Chemical Oxygen Demand (COD)

---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.
On-line Automatic Determinators of Chemical Oxygen Demand (COD) National Measurement Verification Regulations of the People's Republic of China Chemical oxygen demand (COD) online automatic monitor OxygenDemand (COD) Published on December 31,.2019 2020-03-31 Implementation Issued by the State Administration of Market Supervision and Administration Chemical Oxygen Demand (COD) online Verification Regulation of Automatic Monitor Replace JJG 1012-2006 Focal point. National Technical Committee for Environmental Chemometrics Main drafting unit. Jiangxi Institute of Metrology and Testing Shandong Institute of Metrology Shandong Environmental Monitoring Center Station Participated in the drafting unit. Shanxi Institute of Metrology China Guangzhou Analysis and Testing Center This regulation is entrusted to the National Environmental Chemometrics Technical Committee for interpretation The main drafters of this regulation. Yang Yuzhe Jiangxi Institute of Metrology and Testing Sui Feng Shandong Institute of Metrology Liu Wei Shandong Environmental Monitoring Center Station Participating drafters. Li Jun Shanxi Academy of Metrology Luo Jun Guangzhou Analysis and Testing Center Guo Bo Shandong Institute of Metrology

table of Contents

Introduction (Ⅱ) 1 Scope (1) 2 Overview (1) 3 Measurement performance requirements (1) 3.1 Relative indication error (1) 3.2 Indication stability (1) 4 General technical requirements (1) 4.1 Appearance (1) 4.2 Insulation resistance (1) 5 Control of measuring instruments (1) 5.1 Verification conditions (1) 5.2 Verification items (2) 5.3 Verification method (2) 5.4 Processing of verification results (3) 5.5 Verification period (3) Appendix A COD Standard Solution Preparation and Value Determination Method (4) Appendix B Verification Record Format (5) Appendix C Format of the inner pages of the certificate of verification/certification result (7)

Introduction

This regulation is based on JJF1002-2010 "Rules for Compiling National Measurement Verification Regulations", JJF1001-2011 "Tong Prepared in accordance with the provisions of Measurement Terms and Definitions. The technical indicators of this regulation refer to GB/T 32208-2015 "Chemical Oxygen Demand (COD) Analyzer", HJ/T 377-2007 "Technical Requirements for Environmental Protection Products-Chemical Oxygen Demand (CODCr) Water Quality Online Automatic Monitoring "Technique" and HJ828-2017 "Determination of Chemical Oxygen Demand of Water Quality" and the technical requirements and methods in the potassium dichromate method. Compared with JJG 1012-2006, in addition to editorial changes, the main technical content of this regulation has changed as follows. --- Added the introduction content; --- Modified the overview content; --- Modify the lower limit of the measuring range of the instrument; --- Deleted the zero drift project and method; --- Control of measuring instruments adds COD certified reference materials; --- Modified the time interval for the stability of the displayed value and the subsequent verification time --- Appendix A is revised to "COD standard solution preparation and value setting method". The previous releases of this regulation are. --- JJG 1012-2006. Verification Regulation of COD Online Automatic Monitor

1 Scope

This regulation is suitable for online automatic monitoring of chemical oxygen demand (COD) in the measurement range (16 ~ 1000) mg/L The instrument's first verification, subsequent verification and inspection in use.

2 Overview

Chemical Oxygen Demand (COD) refers to the treatment of water with potassium dichromate as oxidant under the condition of strong acid and heating The amount of oxidant consumed in the sample is expressed as the oxygen concentration (mg/L). The chemical oxygen demand (COD) online automatic monitor (hereinafter referred to as the instrument) is mainly used to detect domestic sewage, The detection principle of COD in industrial wastewater and surface water is generally divided into potassium dichromate oxidation-redox drop Determination method, potassium dichromate oxidation-spectrophotometry, potassium dichromate oxidation coulometric titration method, etc. The instrument consists of an automatic sampling unit, It consists of oxidation reaction unit, detection unit, data processing unit and data transmission.

3 Measurement performance requirements

3.1 Relative indication error The relative indication error of the instrument does not exceed ± 10%. 3.2 Indication stability The instrument's indication stability should not exceed ± 10%/24h for the first verification, and the subsequent verification should not exceed ± 10%/4h.

4 General technical requirements

4.1 Appearance The instrument should have the following signs. instrument name, model number, factory number, manufacturing date, manufacturer name, etc. user's Guide. The instrument should not have mechanical damage that hinders normal operation; each regulator rotates flexibly and is positioned accurately; the fixing parts should be free of Loose; after power on, the digital display is complete and clear. 4.2 Insulation resistance The insulation resistance of the instrument should not be less than 20MΩ.

5 Control of measuring instruments

The control of measuring instruments includes. first verification, follow-up verification and inspection in use. 5.1 Verification conditions 5.1.1 Verification environmental conditions 5.1.1.1 Ambient temperature. (5 ~ 40) ℃. 5.1.1.2 Ambient humidity. ≤85% RH. 5.1.1.3 Power supply. AC (220 ± 22) V; (50 ± 0.5) Hz.

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