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GB/T 45131-2025: Analysis of water used in boiler and cooling system - Determination of phosphate, chloride, silicate, total alkalinity, phenolphthalein alkalinity, hardness and iron - Spectrophotometric detection by discrete analysis systems
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Analysis of water used in boiler and cooling system - Determination of phosphate, chloride, silicate, total alkalinity, phenolphthalein alkalinity, hardness and iron - Spectrophotometric detection by discrete analysis systems
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GB/T 45131-2025
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Basic data | Standard ID | GB/T 45131-2025 (GB/T45131-2025) | | Description (Translated English) | Analysis of water used in boiler and cooling system - Determination of phosphate, chloride, silicate, total alkalinity, phenolphthalein alkalinity, hardness and iron - Spectrophotometric detection by discrete analysis systems | | Sector / Industry | National Standard (Recommended) | | Classification of Chinese Standard | G76 | | Classification of International Standard | 13.060.50; 71.040.40 | | Word Count Estimation | 14,197 | | Date of Issue | 2025-01-24 | | Date of Implementation | 2025-08-01 | | Issuing agency(ies) | State Administration for Market Regulation, China National Standardization Administration | GB/T 45131-2025: Analysis of water used in boiler and cooling system - Determination of phosphate, chloride, silicate, total alkalinity, phenolphthalein alkalinity, hardness and iron - Spectrophotometric detection by discrete analysis systems
---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.
ICS 13.060.50;71.040.40
CCSG76
National Standard of the People's Republic of China
Boiler water and cooling water analysis methods Phosphate,
Chloride, silicate, total alkalinity, phenolphthalein alkalinity, hardness and
Iron determination based on discontinuous analysis system
Released on 2025-01-24
2025-08-01 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.
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/TC63).
This document was drafted by. Guangdong Special Equipment Testing Institute Dongguan Testing Institute, Shandong Taihe Technology Co., Ltd., Hengyang Construction
Heng Industrial Co., Ltd., Zhejiang Shuizhiyin Testing Co., Ltd., Lanbao (Xiamen) Water Treatment Technology Co., Ltd., Guangdong Beili Biotechnology Co., Ltd.
Company, Angang Litian (Anshan) Water Treatment Co., Ltd., Nanjing Xinkate Biotechnology Development Co., Ltd., CNOOC Huizhou Petrochemical Co., Ltd.,
Hangzhou Special Equipment Inspection and Scientific Research Institute (Hangzhou Special Equipment Emergency Response Center), Shanghai Juhan Energy Technology Co., Ltd., Nanjing Hua
Tianjin Technology Development Co., Ltd., Shandong Kairui Chemical Co., Ltd., Shanghai Gaosen Water Treatment Co., Ltd., CNOOC Tianjin Chemical Research Institute
LIMITED.
The main drafters of this document are. Wang Yizhuang, Wang Donghai, He Qingfeng, Tang Libo, Wang Zhiwei, Chen Haibin, Ma Rongcai, Chen Guosong, Wang Chaojun,
Chen Tao, Jiang Mei, Gu Lei, Sun Baoji, Zhang Jufang, and Li Lin.
Boiler water and cooling water analysis methods Phosphate,
Chloride, silicate, total alkalinity, phenolphthalein alkalinity, hardness and
Iron determination based on discontinuous analysis system
Spectrophotometry
Warning. Some of the reagents used in this document are toxic and corrosive. Some test procedures may lead to dangerous situations. The operator is responsible for
Take appropriate safety and health measures and operate with caution
1 Scope
This document describes the use of a discontinuous analysis system for the determination of phosphates, chlorides, silicates, total alkalinity, phenolphthalein alkalinity,
Method for determination of hardness and iron content.
This document is applicable to the determination of phosphate, chloride, silicate, total alkalinity, phenolphthalein alkalinity, hardness, and iron content in boiler water and cooling water.
The applicable scope of this method is. phosphate (in terms of PO43-) 1.00mg/L~50.00mg/L, chloride (in terms of Cl-) 10.00mg/L~
100.0mg/L, silicate (in terms of Si) 0.10mg/L~6.00mg/L, total alkalinity 0.50mmol/L~8.00mmol/L, phenolphthalein alkalinity
0.50mmol/L~5.00mmol/L, hardness (with Ca2 and Mg2 as basic units) 0.50mmol/L~1.75mmol/L, iron (with Fe
Calculation) 0.10mg/L~10.00mg/L.
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 to
This document.
GB/T 602 Preparation of standard solutions for determination of impurities in chemical reagents
GB/T 6682-2008 Specifications and test methods for water used in analytical laboratories
GB/T 6907 Boiler water and cooling water analysis method Water sampling method
GB/T 6913 Analysis methods for boiler water and cooling water - Determination of phosphate
GB/T 14427 Analysis methods for boiler water and cooling water Determination of iron
3 Terms and definitions
The following terms and definitions apply to this document.
3.1
By integrating automatic sampling and spectrophotometry modules, an automated system for multi-parameter interval flow analysis is realized.
4 Principle
Based on the discontinuous analysis system, the interval analysis is automatically performed according to the procedures corresponding to each test item in Appendix A to Appendix G.
The sample and reagent are added to the reaction pool for mixing and color reaction. The absorbance of the solution is measured at a certain wavelength.
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