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GB/T 6368-2008 English PDF (GBT6368-2008)

GB/T 6368-2008 English PDF (GBT6368-2008)

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GB/T 6368-2008: Surface active agents -- Determination of pH of aqueous solution -- Potentiometric method

GB/T 6368-2008
GB
ICS 71.100.40
G 72
NATIONAL STANDARD OF
THE PEOPLE’S REPUBLIC OF CHINA
GB/T 6368-2008 / ISO 4316.1977
Replacing GB/T 6368-1993
Surface active agents - Determination of pH of
aqueous solution - Potentiometric method
(ISO 4316.1977, IDT)
ISSUED ON. APRIL 1, 2008
IMPLEMENTED ON. OCTOBER 1, 2009
Jointly issued by. General Administration of Quality Supervision, Inspection and Quarantine (AQSIQ);
Standardization Administration Committee (SAC) of the
People’s Republic of China.
GB/T 17795-2008
Table of Contents
Foreword ... 3
1 Scope ... 4
2 Normative References ... 4
3 Principle ... 4
4 Reagents ... 4
5 Instruments and equipment ... 4
6 Measurement ... 5
7 Test report ... 5
GB/T 17795-2008
Foreword
This standard replaces GB/T 6368-1993 Surface active agents - Determination of pH of aqueous solutions - Potentiometric method.
This standard equivalently adopts ISO 4316.1977 Surface active agents - Determination of pH of aqueous solutions - Potentiometric method.
The main differences between this standard and the previous version.
- Add the Preface;
- Increase the degree of adoption;
- Increase the quantity of measurement samples, so as to be consistent with international standards;
- Add Chapter test report.
This standard was proposed by China Petroleum and Chemical Industry Association. This standard shall be under the jurisdiction of Chemical Industry Surfactant Standardization Technical Committee.
Drafting organizations of this standard. Shanghai Dye Institute Ltd., and Zhejiang Real Chemical Group.
Drafters of this standard. Zhuang Yongbin, Huang Weiqing, Wang Weisong, and Meng Zhaoping.
This standard was first-time released in 1986, and it was first-time revised in 1993. GB/T 17795-2008
Surface active agents - Determination of pH of aqueous
solution - Potentiometric method
1 Scope
This standard specifies the method of adopting potentiometric method to determine pH of aqueous solution of surface active agents.
This standard applies to the determination of pH of aqueous solution of surface active agents. 2 Normative References
The following standards contain provisions which, through reference in this standard, constitute provisions of this standard. For dated reference, the subsequent amendments (excluding corrigendum) or revisions of these publications do not apply. However, the parties who enter into agreement based on this standard are encouraged to investigate the possibility of applying the latest editions of the standards. For undated references, the latest editions of the normative document referred to apply.
GB/T 603-2002 Chemical reagent – Preparations of reagent solution for use in test GB/T 6682-1992 Water for analytical laboratory use - Specification and test methods 3 Principle
Measure the electrode potential difference immersed in an aqueous solution of surface active agent, expressed in pH value.
4 Reagents
4.1 Distilled water. Without carbon dioxide. It shall comply Grade 3 water as specified in GB/T 6682-1992. Prepare it according to provision 4.1.1.1 in GB/T 603-2002. 4.2 Standard buffer solution. Select 2 solutions from the common standard solutions to calibrate the potentiometer. Their pH value shall be as near as possible to the expected pH value of the sample solution. In which, the difference BETWEEN 1 of the standard solution AND the expected value must not be greater than 1 pH unit.
5 Instruments and equipment
5.1 pH meter. Minimum scale of 0.1 pH unit.
5.2 Glass electrode.
5.3 Reference electrode. Calomel / potassium chloride saturated solution type. 5.4 Composite electrode. It is used to replace the glass electrode and reference electrode. GB/T 17795-2008

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