GB/T 14424-2008 English PDF

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GB/T 14424-2008: Industrial circulating cooling water -- Determination of residual chlorine
Status: Valid

GB/T 14424: Historical versions

Standard ID	USD	BUY PDF	Lead-Days	Standard Title (Description)	Status
GB/T 14424-2008	209	Add to Cart	3 days	Industrial circulating cooling water -- Determination of residual chlorine	Valid
GB/T 14424-1993	279	Add to Cart	3 days	Analysis of water used in boiler and cooling system. Determination of free chlorine residuals	Obsolete

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Basic data

Standard ID: GB/T 14424-2008 (GB/T14424-2008)
Description (Translated English): Industrial circulating cooling water -- Determination of residual chlorine
Sector / Industry: National Standard (Recommended)
Classification of Chinese Standard: G76
Classification of International Standard: 71.040.40
Word Count Estimation: 9,969
Date of Issue: 2008-04-01
Date of Implementation: 2008-09-01
Older Standard (superseded by this standard): GB/T 14424-1993
Quoted Standard: GB/T 601
Adopted Standard: ISO 7393-1-1985, NEQ; ISO 7393-2-1985, NEQ
Regulation (derived from): National Standard Approval Announcement 2008 No.5 (Total No.118)
Issuing agency(ies): General Administration of Quality Supervision, Inspection and Quarantine of the People's Republic of China, Standardization Administration of the People's Republic of China
Summary: This standard specifies the industrial circulating cooling water chlorine, determination of free chlorine. This standard applies to the original water and industrial circulating cooling water chlorine, analysis of free chlorine measurement range of 0. 03 mg/L ~ 2. 5 mg/L.

GB/T 14424-2008: Industrial circulating cooling water -- Determination of residual chlorine

---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.
Industrial circulating cooling water. Determination of residual chlorine ICS 71.040.40 G76 National Standards of People's Republic of China Replacing GB/T 14424-1993 Industrial circulating cooling water residual chlorine (ISO 7393-1. 1985, Waterquality-Determinationoffreechlorineand totalchlorine-Part 1. Titrimetricmethodusing N, N-diethyl-1,4-phenylenediamine, ISO 7393-2. 1985, Water quality-Determinationoffreechlorineandtotalchlorine-Part 2. ColorimetricmethodusingN, N-diethyl-1,4-phenylenediamine, for routinecontrolpurposes, NEQ) Posted 2008-04-01 2008-09-01 implementation Administration of Quality Supervision, Inspection and Quarantine of People's Republic of China Standardization Administration of China released

Foreword

This standard corresponds to ISO 7393-1. 1985 "Water quality - Determination of free chlorine and total chlorine - Part 1. N, N- diethyl-1,4-benzenedicarboxylic ". 1985 (English version) and ISO 7393-2" Water quality - Determination of free chlorine and total chlorine - Part 2. amine titration N, N- diethyl-1,4-phenylene Diamine colorimetric method "(in English), this Standard and ISO 7393-1. 1985 and ISO 7393-2. 1985 is not equivalent degree of consistency. This standard replaces GB/T 14424-1993 "boiler water and cooling water - Determination of chlorine analysis." This standard compared with GB/T 14424-1993, the main changes are as follows. --- Standard name from the "boiler water and cooling water - Determination of chlorine analysis method" to "industrial circulating cooling water residual chlorine Measurement "; --- Cancel the GB/T 14424-1993 visual colorimetry of DPD and o-tolidine visual colorimetry; 0.10mg/L ~ --- by the scope of GB/T 14424-1993 provisions of 1.50mg/L expanded to 0.03mg/L ~ 2.50mg/L. Appendix A of this standard is an informative annex. The standard proposed by China Petroleum and Chemical Industry Association. This standard by the National Standardization Technical Committee of Chemical Water Treatment Chemicals Branch (SAC/TC63/SC5) centralized. This standard was drafted. Tianjin Chemical Engineering Research and Design Institute. The main drafters of this standard. Bai Ying, Liu Yanfei, Shaohong Qian, Li Lin. This standard replaces the standard release case. --- GB/T 14424-1993. Industrial circulating cooling water residual chlorine

1 Scope

This standard specifies the industrial circulating cooling water residual chlorine, free chlorine measurement method. This standard applies to raw water and industrial cooling water residual chlorine, free chlorine analysis, measurement range of 0.03mg/L ~ 2.5mg/L.

2 Normative references

The following documents contain provisions which, through reference in this standard and become the standard terms. For dated references, subsequent Amendments (not including errata content) or revisions do not apply to this standard, however, encourage the parties to the agreement are based on research Whether the latest versions of these documents. For undated reference documents, the latest versions apply to this standard. Preparation of GB/T 601 chemical reagent standard titration solution

3 Terms and Definitions

The following terms and definitions apply to this standard. 3.1 With free chlorine, combined chlorine, or present in the form of coexistence of the two chlorine. 3.2 With hypochlorous acid, hypochlorite or solubility of elemental chlorine in the form of chlorine. 3.3 Chlorine to chloramines and organic chloramines form of chlorine. 4 N, N- diethyl-1,4-phenylenediamine spectrophotometry 4.1 Principle 4.1.1 Determination of free chlorine When the pH value of 6.2 to 6.5, free chlorine in the sample with N, N- diethyl-1,4-phenylenediamine (hereinafter referred to as DPD) direct reaction, To form a red compound, in the 510nm wavelength, determined by spectrophotometry. Interference elimination Appendix A. 4.1.2 Determination of chlorine When the pH value of 6.2 to 6.5, in the presence of an excess of potassium iodide, the sample chlorine reacts with DPD to form a red compound, in 510nm wavelength, determined by spectrophotometry. Interference elimination Appendix A. 4.2 Reagents and materials Reagent used in this method, unless otherwise specified, use only analytical reagent and water in line with the provisions of 5.2.1. Drop test standards required Fixed solution, did not indicate when the other requirements, according to the provisions of GB/T 601 was prepared. 4.2.1 Water (excluding oxidizing and reducing substances). Distilled water must be tested according to the following steps. Take two 250mL flasks, first place 100mL bottle of water to be tested and 1g of potassium iodide mixed, 1min, add 5.0mL and 5.0mL DPD buffer solution mixed solution. Placed in the second bottle 100mL water sample to be tested and mix two drops of sodium hypochlorite solution Ⅱ, 2min, add 5.0mL and 5.0mL DPD solution buffered solution Liquid mixing. ......

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