|
US$209.00 · In stock
Delivery: <= 3 days. True-PDF full-copy in English will be manually translated and delivered via email.
GB/T 14424-2008: Industrial circulating cooling water -- Determination of residual chlorine
Status: Valid GB/T 14424: Evolution and historical versions
| Standard ID | Contents [version] | USD | STEP2 | [PDF] delivered in | Standard Title (Description) | Status | PDF |
| GB/T 14424-2008 | English | 209 |
Add to Cart
|
3 days [Need to translate]
|
Industrial circulating cooling water -- Determination of residual chlorine
| Valid |
GB/T 14424-2008
|
| GB/T 14424-1993 | English | 279 |
Add to Cart
|
3 days [Need to translate]
|
Analysis of water used in boiler and cooling system. Determination of free chlorine residuals
| Obsolete |
GB/T 14424-1993
|
PDF similar to GB/T 14424-2008
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Count Estimation | 9,969 | | Date of Issue | 2008-04-01 | | Date of Implementation | 2008-09-01 | | Older Standard (superseded by this standard) | GB/T 14424-1993 | | Quoted Standard | GB/T 601 | | Adopted Standard | ISO 7393-1-1985, NEQ; ISO 7393-2-1985, NEQ | | Regulation (derived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.
|