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GB/T 9736-2008: Chemical reagent -- General method for the determination of acidity and alkalinity
Status: Valid GB/T 9736: Evolution and historical versions
| Standard ID | Contents [version] | USD | STEP2 | [PDF] delivered in | Standard Title (Description) | Status | PDF |
| GB/T 9736-2008 | English | 149 |
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Chemical reagent -- General method for the determination of acidity and alkalinity
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GB/T 9736-2008
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| GB/T 9736-1988 | English | 199 |
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Chemical reagent--General method for the determination of acidity and alkalinity
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GB/T 9736-1988
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PDF similar to GB/T 9736-2008
Basic data | Standard ID | GB/T 9736-2008 (GB/T9736-2008) | | Description (Translated English) | Chemical reagent -- General method for the determination of acidity and alkalinity | | Sector / Industry | National Standard (Recommended) | | Classification of Chinese Standard | G60 | | Classification of International Standard | 71.040.30 | | Word Count Estimation | 5,560 | | Date of Issue | 2008-05-15 | | Date of Implementation | 2008-11-01 | | Older Standard (superseded by this standard) | GB/T 9736-1988 | | Quoted Standard | GB/T 601; GB/T 603; GB/T 6682 | | Adopted Standard | ISO 6353-1-1982, NEQ | | Regulation (derived from) | National Standard Approval Announcement 2008 No.8 (Total No.121) | | 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 determination of acidity by titration analysis, common alkalinity. This standard applies to water-soluble acid reagent, measurement bases. A water-insoluble water- soluble reagent acid, base after extraction with water, may also be measured in the aqueous phase law. The determination of acidity or alkalinity with the standards, according to the specification values ??and the sample size calculation, the standard titration solution with alkali or acid standard solution titration titration volume of not less than 0. 1mL. | GB/T 9736-2008: Chemical reagent -- General method for the determination of acidity and alkalinity
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Chemical reagent. General method for the determination of acidity and alkalinity
ICS 71.040.30
G60
National Standards of People's Republic of China
Replacing GB/T 9736-1988
Chemical Reagents
General method for measuring acidity and alkalinity
(ISO 6353-1. 1982, Reagentsforchemicalanalysis-
Part 1. Generaltestmethods, NEQ)
Posted 2008-05-15
2008-11-01 implementation
Administration of Quality Supervision, Inspection and Quarantine of People's Republic of China
Standardization Administration of China released
Foreword
This standard and ISO 6353-1. 1982 "Chemical analysis of reagent --- Part 1. General test method" non-equivalent.
This standard replaces GB/T "Chemicals acidity and alkalinity determination of the general method," 9736-1988, compared with the GB/T 9736-1988
The main changes are as follows.
--- Improve the water-soluble liquid sample measuring acidity and alkalinity (1988 version 6.1, this version 6.1.1);
--- Modify acidity, alkalinity is calculated and expressed in units of the way (1988 edition, Chapter 7, this edition 6.1.2,6.2.2).
The standard proposed by China Petroleum and Chemical Industry Association.
This standard by the National Standardization Technical Committee Chemistry Chemicals Branch (SAC/TC63/SC3) centralized.
This standard was drafted. Guangdong Guanghua Chemical Factory Co., Ltd.
The main drafters. Zhang Zhibin, body and even the king.
This standard was first published in 1988.
Chemical Reagents
General method for measuring acidity and alkalinity
1 Scope
This standard specifies the general method for the determination of acidity, alkalinity by titration analysis.
This standard applies to acid, alkali reagent water solubility. Water-insoluble reagent water soluble acids, bases, after water extraction, also
Law is available in the aqueous phase measurement.
The determination of acidity or alkalinity use this standard, according to specifications and sample value calculation, the use of alkali or acid standard titration solution standard titration solution drop
A given volume of not less than 0.1mL.
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
GB/T 603 chemical reagent test method Preparations of articles (GB/T 603-2002, ISO 6353-1 with. 1982,
NEQ)
GB/T 6682 analytical laboratory use specifications and test methods (GB/T 6682-2008, ISO 3696. 1987, MOD)
3 PRINCIPLE OF THE METHOD
Samples were subjected to appropriate treatment, the presence therein of acid or base is transferred to the water or a mixture of water and an organic solvent, in a suitable indicator
Under the presence of a predetermined concentration of alkali or acid standard titration solution titration standard solution titration, you can measure the acidity or alkalinity of the sample.
4 Reagents
Unless otherwise specified in this standard, the standard titration solution, formulations and products used, according to GB/T 601, GB/T 603 system requirements
Prepare, test water should be consistent with GB/T 6682 in the three water specifications. Titration of the base application of sodium hydroxide standard titration solution preparation, concentration
[Ba (OH-)] shall not be less than 0.01mol/L; titration used in the preparation of the acid standard volumetric hydrochloric acid or sulfuric acid solution was applied, the concentration of [Ba (H +)] shall not be less
In 0.01mol/L.
5 Determination
5.1 acidity or alkalinity of aqueous samples
5.1.1 measuring step
Take 100mL carbon dioxide-free water, adding a predetermined indicator, with a base or an acid standard titration solution specified in Standard Solution
And, after reaching the end point, the end point indicator color should be maintained for at least 30s. Predetermined amount of the sample (liquid sample added is not greater than
30mL), alkali or acid standard titration solution titrated with standard volumetric solution prescribed, at the finish, ending color indicator should be at least maintained
30s.
5.1.2 Calculation Results
Aqueous samples acidity (in H +) or alkalinity (OH- dollars) molality Chou, values \u200b\u200bto millimoles per gram (mmol/g) table
Shows, according to equation (1).
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