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GB/T 6908-2018: Analysis of water used in boiler and cooling system -- Determination of electrical conductivity
Status: Valid GB/T 6908: Evolution and historical versions
| Standard ID | Contents [version] | USD | STEP2 | [PDF] delivered in | Standard Title (Description) | Status | PDF |
| GB/T 6908-2018 | English | 119 |
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Analysis of water used in boiler and cooling system -- Determination of electrical conductivity
| Valid |
GB/T 6908-2018
|
| GB/T 6908-2008 | English | 239 |
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Analysis of water used in boiler and cooling system -- Determination of electrical conductivity
| Obsolete |
GB/T 6908-2008
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| GB/T 6908-2005 | English | 239 |
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Analysis of water used in boil and cooling system -- The determination of electrical conductivity for water
| Obsolete |
GB/T 6908-2005
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| GB/T 6908-1986 | English | 199 |
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Methods for analysis of water for boiler and for cooling--The determination of electrical conductivity for water
| Obsolete |
GB/T 6908-1986
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PDF similar to GB/T 6908-2018
Standard similar to GB/T 6908-2018 GB/T 6913 GB/T 6903 GB/T 6907 Basic data | Standard ID | GB/T 6908-2018 (GB/T6908-2018) | | Description (Translated English) | Analysis of water used in boiler and cooling system -- Determination of electrical conductivity | | Sector / Industry | National Standard (Recommended) | | Classification of Chinese Standard | G76 | | Classification of International Standard | 71.040.40 | | Word Count Estimation | 6,634 | | Date of Issue | 2018-06-07 | | Date of Implementation | 2019-01-01 | | Issuing agency(ies) | State Administration for Market Regulation, China National Standardization Administration | GB/T 6908-2018: Analysis of water used in boiler and cooling system -- Determination of electrical conductivity
---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 electrical conductivity
ICS 71.040.40
G76
National Standards of People's Republic of China
Replace GB/T 6908-2008
Boiler water and cooling water analysis method
Determination of conductivity
Published on.2018-06-07
2019-01-01 implementation
State market supervision and administration
China National Standardization Administration issued
Foreword
This standard was drafted in accordance with the rules given in GB/T 1.1-2009.
This standard replaces GB/T 6908-2008 "Determination of Conductivity of Boiler Water and Cooling Water Analysis Methods", and GB/T 6908-
In.2008, in addition to editorial changes, the main technical changes are as follows.
--- Revised scope (see Chapter 1, Chapter 1 of the.2008 edition);
--- Adjust the contents of Table 1 in 5.8 to Appendix A (see Appendix A,.2008 edition 5.8);
--- Deleted Table 2 in 7.2 (see.2008 edition 7.2);
--- Added the requirement to "measure water samples with conductivity less than 3μS/cm" (see 7.4);
--- Removed the operation of "conductivity constant correction" (see.2008 edition 7.6);
--- Modify "precision" to "permitted poor" (see Chapter 9, Chapter 8 of the.2008 edition);
--- Removed the test report (see Chapter 9 of the.2008 edition).
This standard was proposed by the China Petroleum and Chemical Industry Federation.
This standard is under the jurisdiction of the National Chemical Standardization Technical Committee Water Treatment Agent Subcommittee (SAC/TC63/SC5).
This standard is drafted by. Shenzhen Junnuo Testing Co., Ltd., Guangzhou Special Pressure Equipment Testing Institute, METTLER TOLEDO Instruments
(Shanghai) Co., Ltd., Ningbo Special Equipment Inspection and Research Institute, Jiangsu Special Equipment Safety Supervision and Inspection Institute, Changzhou Branch, Zhejiang Water
Zhiyin Testing Co., Ltd., Nanjing University Yixing Environmental Protection Research Institute, Shanghai Yidian Scientific Instrument Co., Ltd., Switzerland Wantong China Co., Ltd.
Division, Shijiazhuang Zhiyuan Environmental Protection Technology Co., Ltd., CNOOC Tianjin Chemical Research and Design Institute Co., Ltd.
The main drafters of this standard. Li Guanxia, Yu Fen, Chen Jianxia, Zhou Ying, Yu Guangfeng, Yu Minghua, Ren Hongqiang, Xu Yugong, Gong Yan, Li Yongguang,
Zhang Quan.
The previous versions of the standards replaced by this standard are.
---GB/T 6908-1986, GB/T 6908-2005, GB/T 6908-2008;
---GB/T 12147-1989.
Boiler water and cooling water analysis method
Determination of conductivity
1 Scope
This standard specifies the method for determining the conductivity of boiler water and cooling water.
This standard is applicable to the determination of conductivity in boiler water, cooling water and demineralized water at 0.055μS/cm~106μS/cm (25°C).
This standard also applies to the determination of the conductivity of natural water and domestic water.
2 Normative references
The following documents are indispensable for the application of this document. For dated references, only dated versions apply to this article.
Pieces. For undated references, the latest edition (including all amendments) applies to this document.
GB/T 6682-2008 Analytical laboratory water specifications and test methods
GB/T 6907 boiler water and cooling water analysis method water sample collection method
3 Principle
The acid, alkali, and salt electrolyte dissolved in water dissociate into positive and negative ions in the solution, so that the electrolyte solution has electrical conductivity and conductivity.
The size is expressed in terms of conductivity.
4 reagents or materials
4.1 General. Reagents and water used in this standard, unless otherwise specified, should be used with superior grade reagents and in accordance with GB/T 6682 secondary water.
4.2 Potassium chloride.
4.3 Potassium chloride standard solution I. c (KCl) = 0.1 mol/L. Weigh 7.455g of potassium chloride which was previously dried at 105 ° C ~ 110 ° C for 2 h,
Dissolve in water, transfer to a 1000 mL volumetric flask, dilute to the mark at (20 ± 2) °C, and mix. Put in a polyethylene bottle or a hard glass bottle
Medium, sealed and preserved. Or use a commercially available standard solution.
4.4 Potassium chloride standard solution II. c (KCl) = 0.01 mol/L. Weigh 0.7455g of potassium chloride dried at 105 ° C ~ 110 ° C for 2 h,
After dissolving in water, transfer it to a 1000 mL volumetric flask, dilute to the mark at (20 ± 2) °C, and mix. Put in a polyethylene bottle or a hard glass bottle,
Sealed and stored. Or use a commercially available standard solution.
4.5 Potassium chloride standard solution III. c (KCl) = 0.001 mol/L. Pipette 100 mL of potassium chloride standard solution at (20 ± 2) °C with a pipette
(4.4) In a 1000 mL volumetric flask, dilute to the mark with first-grade water and mix.
4.6 Potassium chloride standard solution IV. c (KCl) = 1 × 10-4 mol/L. Pipette 10 mL of potassium chloride standard solution at (20 ± 2) °C
In a liquid (4.4) to 1000 mL volumetric flask, dilute to the mark with primary water and mix.
5 instruments
5.1 Conductivity meter. Select the appropriate conductivity meter according to the conductivity measurement range of the water sample to be tested. Measuring conductivity less than 0.1μS/cm
When the water sample is used, the instrument resolution is 0.005 μS/cm.
5.2 Conductive electrode (referred to as electrode). Select the appropriate conductivity electrode according to the conductivity measurement range of the water sample to be tested. Measuring conductivity is less than
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