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GB/T 14420-2024: Analysis of water used in boiler and cooling system - Determination of chemical oxygen demand - Rapid method with potassium dichromate
Status: Valid GB/T 14420: Evolution and historical versions
| Standard ID | Contents [version] | USD | STEP2 | [PDF] delivered in | Standard Title (Description) | Status | PDF |
| GB/T 14420-2024 | English | 319 |
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Analysis of water used in boiler and cooling system - Determination of chemical oxygen demand - Rapid method with potassium dichromate
| Valid |
GB/T 14420-2024
|
| GB/T 14420-2014 | English | 209 |
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Analysis of water used in boiler and cooling system -- Determination of chemical oxygen demand -- Rapid method with potassium dichromate
| Valid |
GB/T 14420-2014
|
| GB/T 14420-1993 | English | 199 |
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2 days [Need to translate]
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Analysis of water used in boiler and cooling system. Determination of chemical oxygen demand. Rapid method with potassium dichromate
| Obsolete |
GB/T 14420-1993
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PDF similar to GB/T 14420-2024
Basic data | Standard ID | GB/T 14420-2024 (GB/T14420-2024) | | Description (Translated English) | Analysis of water used in boiler and cooling system - Determination of chemical oxygen demand - Rapid method with potassium dichromate | | Sector / Industry | National Standard (Recommended) | | Classification of Chinese Standard | G76 | | Classification of International Standard | 13.060.50, 71.040.40 | | Word Count Estimation | 16,139 | | Date of Issue | 2024-07-24 | | Date of Implementation | 2025-02-01 | | Older Standard (superseded by this standard) | GB/T 14420-2014 | | Issuing agency(ies) | State Administration for Market Regulation, China National Standardization Administration | GB/T 14420-2024: Analysis of water used in boiler and cooling system - Determination of chemical oxygen demand - Rapid method with potassium dichromate
---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.
Analysis of water used in boiler and cooling system - Determination of chemical oxygen demand - Rapid method with potassium dichromate
Boiler water and cooling water analysis methods
Determination of chemical oxygen demand - Potassium dichromate rapid method
Analysis of water used in boiler and cooling system-Determination of
chemical oxygen demand-Rapid method with potassium dichromate
ICS 13.060.50; 71.040.40
CCS G76
National Standard of the People's Republic of China
Replaces GB/T 14420-2014
Released on 2024-07-24
2025-02-01 Implementation
State Administration for Market Regulation
The National Standardization Administration issued
Foreword
This document is in accordance with the provisions of GB/T 1.1-2020 "Guidelines for standardization work Part 1.Structure and drafting rules for standardization documents"
Drafting.
This document replaces GB/T 14420-2014 "Analysis of boiler water and cooling water - Determination of chemical oxygen demand - Potassium dichromate rapid
Compared with GB/T 14420-2014, in addition to structural adjustments and editorial changes, the main technical changes are as follows.
Changed the scope (see Chapter 1, Chapter 1 of the.2014 edition); -
Changed the volumetric method (see 5.1, Chapter 4 of the.2014 edition); -
Added potentiometric titration (see 5.2); -
Changed spectrophotometry (see Chapter 6, Chapter 5 of the.2014 edition); -
Rapid spectrophotometry has been added (see Chapter 7); -
Added safety and environmental protection requirements (see Chapter 8); -
The treatment methods for mercury-containing waste liquids (see Appendix A of the.2014 edition) have been deleted. -
Please note that some of the contents of this document may involve patents. The issuing organization of this document does not assume the responsibility for identifying patents.
This document was proposed by the China Petroleum and Chemical Industry Federation.
This document is under the jurisdiction of the National Technical Committee on Chemical Standardization (SAC/TC 63).
This document was drafted by. Chengdu Huijin Water Development Co., Ltd., Guangzhou Special Pressure Equipment Testing Institute, Longbai Group Co., Ltd.
Company, Ningxia Ruitai Technology Co., Ltd., Zhejiang Jialing Environmental Protection Technology Co., Ltd., Shandong Taihe Technology Co., Ltd., Nanjing Industrial
University of Science and Technology, Zhejiang Luheng Environmental Technology Co., Ltd., CNOOC Tianjin Chemical Research and Design Institute Co., Ltd., Guangdong Special Equipment Testing Research Institute
Huizhou Testing Institute of the Institute, Angang Kurita (Anshan) Water Treatment Co., Ltd., Shanghai Yidian Scientific Instrument Co., Ltd., Jiangsu Special Equipment
Safety Supervision and Inspection Institute, CNOOC Huizhou Petrochemical Co., Ltd., Jiangsu Ecological Environment Monitoring and Control Co., Ltd., Swiss Metrohm China Co., Ltd.
Co., Ltd., Nanjing Xinkate Biotechnology Development Co., Ltd., and Jiangsu Shengaohua Environmental Protection Technology Co., Ltd.
The main drafters of this document are. Cai Bingxian, Li Maodong, Sun Liang, Fan Changchun, Shen Ping, Yao Ya, Chen Guosong, Wu Dan, Wang Yan, Liu Fu,
Wang Youbin, Xu Baigong, Wang Jiawen, Liu Baomin, Wu Shaohua, Liu Binhua, Shi Chengcheng, Wei Yongjun, Huang Rong, Du Yuhui, Chen Xiaoli,
Wu Shengping.
This document was first issued in.1993, revised for the first time in.2014, and this is the second revision.
Boiler water and cooling water analysis methods
Determination of chemical oxygen demand - Potassium dichromate rapid method
Warning. The reagent mercuric sulfate used in this document is a highly toxic chemical. Sulfuric acid is highly corrosive. Please wear the required protective clothing when operating.
Wear protective equipment and avoid contact with skin and clothing. If splashed with sulfuric acid, rinse immediately with plenty of water and seek medical attention immediately if serious.
Point out all possible safety issues. Users are responsible for taking appropriate safety and health measures and ensuring compliance with relevant national laws and regulations.
condition.
1 Scope
This document describes a rapid method for the determination of chemical oxygen demand in boiler and cooling water using potassium dichromate.
The volumetric method in this document is applicable to boiler water and cooling water with a chemical oxygen demand (COD Cr) of 10 mg/L to 1 000 mg/L (measured in oxygen).
Spectrophotometry and rapid spectrophotometry are applicable to boiler water and cooling water with chemical oxygen demand (CODCr) of 15 mg/L~
Determination of 1 000 mg/L.
This document is also applicable to the determination of chemical oxygen demand (CODCr) in surface water, groundwater, domestic sewage and industrial wastewater.
2 Normative references
The contents of the following documents constitute the essential clauses of this document through normative references in this document.
For referenced documents without a date, only the version corresponding to that date applies to this document; for referenced documents without a date, the latest version (including all amendments) applies.
in this document.
GB/T 6682-2008 Specifications and test methods for water used in analytical laboratories
HG/T 5012 Guidelines for safe pretreatment of laboratory waste chemicals
HJ/T 399-2007 Water quality-Determination of chemical oxygen demand-Rapid digestion spectrophotometric method
3 Terms and definitions
There are no terms or definitions that require definition in this document.
4 General
Unless otherwise specified, the reagents and water used in this document are analytical grade or above and conform to the three
Grade water.
5 Volumetric method
5.1 Indicator method
5.1.1 Principle
A known amount of potassium dichromate solution was added to the water sample, and a silver salt was used as a catalyst in a sulfuric acid medium. After boiling and refluxing, a 1,10 x phenanthrene solution was added.
The unreduced potassium dichromate in the water sample is titrated with ammonium ferrous sulfate standard titration solution using ferrous sulfate as the indicator.
The amount of ammonium is used to calculate the chemical oxygen demand in the water sample. Appropriate amounts of silver nitrate and bismuth nitrate should be added during the determination to eliminate the interference of chloride ions.
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