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GB/T 22428.2-2008: Starch hydrolysis products -- Determination of water content
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Starch hydrolysis products -- Determination of water content
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GB/T 22428.2-2008
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Basic data | Standard ID | GB/T 22428.2-2008 (GB/T22428.2-2008) | | Description (Translated English) | Starch hydrolysis products -- Determination of water content | | Sector / Industry | National Standard (Recommended) | | Classification of Chinese Standard | X11 | | Classification of International Standard | 67.180.20 | | Word Count Estimation | 8,822 | | Date of Issue | 2008-10-19 | | Date of Implementation | 2009-03-01 | | Older Standard (superseded by this standard) | GB/T 12100-1989 | | Quoted Standard | ISO 760 | | Adopted Standard | ISO 5381-1983, IDT | | Regulation (derived from) | National Standard Approval Announcement 2008 No.17 (Total No.130) | | 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 method improved Karl Fischer method for the determination of water content of starch hydrolysates. This standard applies to starch hydrolysis products. | GB/T 22428.2-2008: Starch hydrolysis products -- Determination of water content---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.
Starch hydrolysis products. Determination of water content
ICS 67.180.20
X11
National Standards of People's Republic of China
GB/T 22428.2-2008/ISO 5381. 1983
Replacing GB/T 12100-1989
Starch hydrolysis products Determination of moisture
(ISO 5381. 1983, Starchhydrolysisproducts-Determinationof
watercontent-ModifiedKarlFischermethod, IDT)
Posted 2008-10-19
2009-03-01 implementation
Administration of Quality Supervision, Inspection and Quarantine of People's Republic of China
Standardization Administration of China released
Foreword
This standard is identical with ISO 5381. 1983 "starch hydrolysis products Determination of moisture modified Karl Fischer method" (in English), within
Content and structure of ISO 5381. 1983 is consistent, only made editorial changes.
This standard replaces GB/T 12100-1989 "Determination of moisture content of starch hydrolysis products."
This standard and GB/T 12100-1989 compared to major changes are as follows.
--- Standard name changed to "starch hydrolysis product moisture content determination";
--- Improve the standard format, the standard specification of SI units;
--- Added "8 Experiment Report";
--- Added "Appendix A (informative) syringe";
--- Added "Appendix B (informative) illustrates Karl Fischer instruments."
The Standard Appendix A, Appendix B is an informative annex.
This standard is proposed and managed by China General Chamber of Commerce.
This standard was drafted. Chinese Chamber of Commerce Business Standard centers, food, Jiangnan University, China Starch Industry Association modified starch
professional committee.
The main drafters of this standard. Guzheng Biao, Hong Yan, Cheng Li, Chen Hongxing, Liu Hong, Jin Xiaolei.
GB/T 22428.2-2008/ISO 5381. 1983
Starch hydrolysis products Determination of moisture
1 Scope
This standard specifies the method improved Karl Fischer (KarlFischer) method for the determination of water content of starch hydrolyzate.
This standard applies to starch hydrolysis products.
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.
ISO 760 Karl Fischer water determination (KarlFischer) method
Principle 3
With a steady Karl Fischer reagent of pre-dispersed in methanol - water content of formamide in the sample mixture.
4 Scheme
H2O + I2 + SO2 + 3C5H5N → 2C5H5N · HI + C5H5N · SO3
C5H5N · SO3 + ROH → C5H5NH · OSO2OR
Note. R is 2-methoxyethyl root.
5 Reagents
Use analytical grade reagents and distilled water or equivalent purity water and all the water content of the solvent content must be below 0.1%.
5.1 stable Karl Fischer reagents. commercially available.
5.2 Methanol - formamide solvent. a mixture of 700mL of anhydrous methanol and 300mL of anhydrous formamide together.
5.3 sodium tartrate. Na2C4H4O6 · 2H2O crystals.
You can purchase marked "Closed for Karl Fischer method" of this reagent. It can also be self-prepared. with 10mL of methanol - formamide solvent (4.2)
Washed with sodium tartrate, and for an appropriate blank determination.
Pulverized sodium tartrate, it can all through 250μm sieve. The water content of the mass fraction of about 15.66 percent, with 150 ℃ true
Air dried to constant weight.
6 Instruments
6.1 Pipette. 20mL and appropriate volume.
6.2 plug weighing tube. the diameter of the tube suitable for weighing the composition of solid samples.
6.3 Syringe. 10mL. See Appendix A.
6.4 pipette. Volume appropriate.
6.5 Karl Fischer titrator or similar device. See Appendix B.
6.6 Analytical balance.
7 operation
Prepare 7.1 Instrument
The reagents should be calibrated before use, as required titrator card installation.
GB/T 22428.2-2008/ISO 5381. 1983
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