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GB/T 12737-2008: Chemical products for industrial use -- General method for determination of traces of sulphur compounds, as sulphate, by reduction and titrimetry
Status: Valid GB/T 12737: Evolution and historical versions
| Standard ID | Contents [version] | USD | STEP2 | [PDF] delivered in | Standard Title (Description) | Status | PDF |
| GB/T 12737-2008 | English | 234 |
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Chemical products for industrial use -- General method for determination of traces of sulphur compounds, as sulphate, by reduction and titrimetry
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GB/T 12737-2008
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| GB/T 12737-1991 | English | 399 |
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Chemical products for industrial use--General method for determination of traces of sulfate by reduction and titrimetry
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GB/T 12737-1991
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PDF similar to GB/T 12737-2008
Basic data | Standard ID | GB/T 12737-2008 (GB/T12737-2008) | | Description (Translated English) | Chemical products for industrial use -- General method for determination of traces of sulphur compounds, as sulphate, by reduction and titrimetry | | Sector / Industry | National Standard (Recommended) | | Classification of Chinese Standard | G10 | | Classification of International Standard | 71.040.40 | | Word Count Estimation | 12,151 | | Date of Issue | 2008-04-01 | | Date of Implementation | 2008-09-01 | | Older Standard (superseded by this standard) | GB/T 12737-1991 | | Adopted Standard | ISO 6228-1980, IDT | | Regulation (derived from) | National Standard Approval Announcement 2008 No.5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 general method of trace sulfur compounds of industrial chemical products as sulphate determination-the reduction and titration. In the present method can be used in the treatment of chemical products standard sample method should be specified. The sulfur is converted to a compound that, when necessary, the general steps required for any possible improvements. | GB/T 12737-2008: Chemical products for industrial use -- General method for determination of traces of sulphur compounds, as sulphate, by reduction and titrimetry
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Chemical products for industrial use. General method for determination of traces of sulphur compounds, as sulphate, by reduction and titrimetry
ICS 71.040.40
G10
National Standards of People's Republic of China
GB/T 12737-2008/ISO 6228. 1980
Replacing GB/T 12737-1991
Trace industrial chemical products used to sulfate represented
General method for determination of sulfur compounds
Reduction titration
(ISO 6228. 1980, IDT)
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 is equivalent to international standards ISO 6228. Determination of trace sulfur compounds 1980 (E) "industrial chemicals in sulfate represented
Given the general method of reduction and titration. "
This standard is the international standard ISO 6228. 1980 (E) on the same technical content, but contains the following editorial changes.
. "" Instead of using the decimal point --- "";
--- Use the "standard" instead of "this International Standard";
--- With "L" (L) in place of "l";
--- As clear operation, after 4.4 will be "the agent" plus "(also liquid)";
--- The reagent concentration percentage (m1/m1) to the mass fraction.
This standard replaces GB/T 12737-1991 "General method of trace chemical products Determination of Sulphate reduction titration."
This standard compared with GB/T 12737-1991, the main changes are as follows.
--- Respect for the original ISO , also prepared using liquid hydrogen iodate by the mass fraction of more than 55% to about 57% concentrated hydrochloric acid change
38% (Excerpts 44, 1991, version 3.6.);
--- Remove the mercury standard titration solution of acetic acid formulas or mercury nitrate standard titration solution concentration (edition 44, 1991 Version 3.6.);
--- Removed Sulfate (SO4 dollars) is calculated content (edition 44, 1991 Version 3.6.);
--- Adjust some interfering ions maximum permissible limit (Excerpts Appendix B, 1991 edition Appendix A);
--- Remove the pre-treatment method, formic acid, oxalic acid sample (Excerpts Appendix A, 1991 edition of Appendix B);
--- Remove the purification method hydroiodic (1991 edition Appendix C).
The Standard Appendix A, Appendix B and Appendix C are informative appendices.
The standard proposed by China Petroleum and Chemical Industry Association.
This standard by the National Standardization Technical Committee chemical inorganic chemicals Club (SAC/TC63/SC1) centralized.
Drafting of this standard. Shandong Entry-Exit Inspection and Quarantine Tianjin, Tianjin Chemical Engineering Research and Design Institute.
The main drafters of this standard. Liu Ruo, Zhaozu Liang, Liu Shao from Lu Siwei.
This standard was first published in 1991.
GB/T 12737-2008/ISO 6228. 1980
Foreword ISO
ISO (International Organization for Standardization) is a worldwide federation of national standards bodies States agencies (ISO member bodies) jointly organized. International
The development of standards by ISO technical committees. Each member organization has the right to send representatives to participate in issues that concern them skills
Operation Committee. Governments or non-governmental international organization, where the liaison with ISO , also take part in the work.
International Standards adopted by the technical committee, before the adoption of the international standard ISO Council, first circulated to the member bodies for comments.
National Standard ISO 6228 was developed and distributed to the members of the ISO /T C47 Chemistry Council in November 1978.
This standard consists of the following member countries agree to.
Australia and Hungary Romania
Austria and India South Africa
Belgium, Italy and Switzerland
Brazil, Thailand, South Korea
China Netherlands United Kingdom
Czech, Slovakia and Philippines Soviet Union
France, Poland and Yugoslavia
Germany and Portugal
No members oppose this standard.
The international standards by the International Union of Pure and Applied Chemistry (IUPAC) recognized.
GB/T 12737-2008/ISO 6228. 1980
Trace industrial chemical products used to sulfate represented
General method for determination of sulfur compounds
Reduction titration
1 Scope
This standard specifies the general method of trace sulfur compounds of industrial chemical products to indicate sulfate reduction and measured --- titration.
Standards can be used in chemical products of the method of sample handling methods shall be defined so that the converted to sulfate sulfur compounds, if necessary
General Procedure for any improvements that may be required.
2 Applications
This method is applicable to the determination of the solution, or in some cases directly measured in a sample sulfate (SO2-4) content in the range of
4.5μg ~ 450μg. The test solution was measured and taken as the water content should not exceed 2mL. Elements in the Samples interference should not exceed
Over the allowable limit, this limit according to the standard method of adopting the related chemical products made in regulations.
Sulfur compounds in the product should be in the form of sulphate, of other sulfur-containing compounds to the sample should be pretreated to obtain an appropriate
Sulfate-containing test solution.
This method is expected precision of ± 5%.
NOTE. hydrochloric acid in place of the reducing solution, can be determined in the presence of sulfide (but non-polysulfide) other sulfur compounds.
Principle 3
If desired, the first change in a sample of sulfur compounds into sulfate, and then use the hydrogen iodide acid and phosphinic acid (hypophosphorous acid) in the presence of hydrochloric acid mixed
The composition of sulfate ions reduced to hydrogen sulfide. A stream of nitrogen and hydrogen sulfide out of the absorption with acetone solution of sodium hydroxide. To 1,5
Phenyl-3-thioxo Kabbah hydrazone (dithizone) as an indicator, with mercuric acetate or nitrate mercury standard titration solution titration sulfur ions.
4 Reagents
Analysis using analytical grade reagents and only distilled water or water of appropriate purity.
4.1 acetone.
4.2 nitrogen, oxygen-free.
4.3 Sodium hydroxide. 40g/L solution.
4.4 reducing solution.
Equipped with a reflux condenser 1000mL spherical grinding mouth three-necked flask (Figure 1), in the case of nitrogen (4.2), and sequentially added.
--- 100mLρ (density) near 1.71g/mL, from about 57% by mass of hydroiodic acid solution;
--- 25mLρ (density) near 1.21g/mL, from about 50 wt.% Hypophosphorous acid (H3PO2) solution;
--- 100mLρ (density) near 1.19g/mL, about 38% of the mass fraction of hydrochloric acid solution.
Installed reflux condenser, nitrogen slowly (4.2) was blown into the mixture boiled under reflux for about 4h.
In keeping cool to room temperature under a nitrogen stream.
The reagent (reducing solution) is placed with a ground glass-stoppered dark glass bottles stored in the dark, glass bottles require advance with nitrogen (4.2) blowing original
The air kept under a nitrogen atmosphere.
The solution is stable for a few weeks.
Note. This reagent (reducing solution) should be prepared in a fume hood to drain the release of hydrogen chloride.
GB/T 12737-2008/ISO 6228. 1980
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