GB/T 45131-2025Analysis 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 (English PDF)

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

GB/T 602

GB/T 6682-2008

GB/T 6907

GB/T 6913

GB/T 14427

3 Terms and definitions

The following terms and definitions apply to this document.

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.