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GB/T 6324.3-2011 English PDF (GBT6324.3-2011)

GB/T 6324.3-2011 English PDF (GBT6324.3-2011)

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GB/T 6324.3-2011: Test method of organic chemical products -- Part 3: Determination of permanganate-reducing substances

This Part specifies the visual colorimetric method and titration method used for the determination of potassium permanganate in organic chemical products.
GB/T 6324.3-2011
GB
NATIONAL STANDARD OF
THE PEOPLE REPUBLIC OF CHINA
ICS 71.080.01
G 15
Replacing GB/T 6324.3-1993
Test method of organic chemical products ?€? Part 3.
Determination of permanganate-reducing substances
ISSUED ON. JUNE 16, 2011
IMPLEMENTED ON. NOVEMBER 1, 2011
Issued by. General Administration of Quality Supervision, Inspection and Quarantine;
Standardization Administration Committee.
Table of Contents
Foreword ... 3
1 Scope ... 5
2 Normative references ... 5
3 Test method ... 5
Foreword
GB/T 6324 Test method of organic chemical products consists of six parts. - Part 1. Water miscibility test of liquid organic chemical products;
- Part 2. Determination of dry residue after evaporation on a water bath for volatile organic liquids;
- Part 3. Determination of permanganate-reducing substances;
- Part 4. Determination of trace sulfur in organic liquid products -
Microcoulometric method;
- Part 5. Determination of trace quantities of carbonyl compounds in
organic chemicals;
- Part 6. Determination of color for liquids - Tristimulus colorimetry. This Part is the third part of GB/T 6324.
This Part was drafted in accordance with the rules given in GB/T 1.1-2009. This Part replaces GB/T 6324.3-1993 Organic chemical products for industrial use - Test method for the determination of permanganate-reducing substances. Compared with GB/T 6324.3-1993, the main technical changes are as follows. - modified Standard?€?s name;
- modified the reagents used to prepare standard colorimetric solutions (see 3.3.2.2 of this Edition, 3.1.2.2 of Edition 1993);
- modified the observation way in the analysis procedure from axial
observation to axial or lateral observation (see 3.3.4 of this Edition, 3.1.2.2 of Edition 1993);
- deleted the recommended ratio table of standard colorimetric solution used by part of products (see Table A.1 of Edition 1993).
This Part was redrafted on the basis of adopting ASTM D 1363.2006 Standard Test Methods for Vulcanized Rubber and Thermoplastic Elastomers - Tension. The degree of conformance with ASTM D1363.2006 is non-equivalent.
This Part was proposed by China Petroleum and Chemical Industry Association. This Part shall be under the jurisdiction of Subcommittee on Organic, National Technical Committee on Chemical of Standardization Administration of China (SAC/TC 63 / SC 2).
Test method of organic chemical products - Part 3.
Determination of permanganate-reducing substances
1 Scope
This Part specifies the visual colorimetric method and titration method used for the determination of potassium permanganate in organic chemical products. The visual colorimetric method of this Part is applicable to the determination of of potassium permanganate in neutral, weakly acidic and weakly basic organic chemical products. The titration method is applicable to organic chemical products with potassium permanganate index equal to or greater than 10 mg / 100mL and which do not react with potassium permanganate under acidic
conditions.
2 Normative references
The following referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies.
GB/T 601 Chemical Reagent - Preparations of Standard Volumetric
Solutions
GB/T 603 Chemical Reagent ?€? Preparations of Reagent Solution for Use
in Test (GB/T 603-2002, ISO 6353-1.1982, NEQ)
GB/T 3143 Color determination method of liquid chemicals (Hazen unit--
Platinum-cobalt scale)
GB/T 6682 Water for analytical laboratory use - Specification and test
methods (GB/T 6682-2008, ISO 3696.1987, MOD)
3 Test method
3.1 Warning
Some test procedures specified in the test method may result in hazardous situations, and the operator shall take appropriate safety and protective measures.
3.3.3.2 Colorimetric tube. 50 mL or 100 mL (scale line at 50 mL), colorless and transparent glass products, with grinding mouth glass plug.
3.3.4 Analysis procedures
3.3.4.1 Conduct sampling according to the provisions of product standard. Place in the colorimetric tube.
3.3.4.2 Place the colorimetric tube containing sample in the water bath of which the temperature can be controlled at (15 ?? 0.5)??C or (25 ?? 0.5)??C. After 15 min, take the colorimetric tube out from water bath. In accordance with the requirements of product standard, add a specified amount of potassium
permanganate solution (record time since adding starts). Immediately plug it. Shake it well. Put it back to water bath. Often take the colorimetric tube out from the water bath. Take white as background. Axially or laterally observe the color of the test solution or compare with the standard colorimetric solution of same volume. If necessary, leave the background a certain distance of 50 mm ~ 150 mm. When the result of the measurement is approached, compare once per
minute. Record the time that the test solution pink just faded or the time when the color of the test solution is consistent with the standard colorimetric solution. Avoid direct exposure of the test solution to strong sunlight during the test. 3.3.5 Expression of results
3.3.5.1 Potassium permanganate time. from the addition of potassium
permanganate solution to the beginning of the test solution pink just fade time OR the time when the color of the test solution is consistent with the color of the standard colorimetric solution in minutes (min).
3.3.5.2 If the residual color of the test solution is deeper than the color of the standard colorimetric solution, the potassium permanganate time shall be reported greater than t min. If the residual color of the test solution is comparable to that of the standard colorimetric solution, the potassium permanganate time shall be reported equal to t min. If the residual color of the test solution is lighter than the color of the standard colorimetric solution, the potassium permanganate time shall be reported less than t min. Where, t min is the index value specified in the product standard for the test sample. 3.3.5.3 Specific potassium permanganate times may be reported in min.
3.3.5.4 Take arithmetic mean of the results of two parallel determinations as result of report. The absolute difference between the two parallel determinations. less than 100 min, not greater than 5% of the arithmetic mean of the two measurement results; greater than 100 min, not greater than 10% of the
arithmetic mean of the two measurement results.

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