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GB/T 26626-2011: Animal and vegetable fats and oils -- Determination of water content -- Karl Fischer method (pyridine free)
Status: Valid
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| GB/T 26626-2011 | English | 234 |
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Animal and vegetable fats and oils -- Determination of water content -- Karl Fischer method (pyridine free)
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GB/T 26626-2011
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Basic data | Standard ID | GB/T 26626-2011 (GB/T26626-2011) | | Description (Translated English) | Animal and vegetable fats and oils -- Determination of water content -- Karl Fischer method (pyridine free) | | Sector / Industry | National Standard (Recommended) | | Classification of Chinese Standard | X14 | | Classification of International Standard | 67.200.10 | | Word Count Estimation | 12,186 | | Date of Issue | 2011-06-16 | | Date of Implementation | 2011-11-01 | | Quoted Standard | GB/T 15687 | | Adopted Standard | ISO 8534-2008, IDT | | Regulation (derived from) | Announcement of Newly Approved National Standards No. 9 of 2011 | | 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 animal fats (hereinafter referred to as fat) Karl Fischer moisture content determination method, in which the reagents contain pyridine. | GB/T 26626-2011: Animal and vegetable fats and oils -- Determination of water content -- Karl Fischer method (pyridine free)
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Animal and vegetable fats and oils. Determination of water content. Karl Fischer method (pyridine free)
ICS 67.200.10
X14
National Standards of People's Republic of China
Determination of the moisture content of animal fat
Karl Fischer method (pyridine free)
KarlFischermethod (pyridinefree)
(ISO 8534.2008, IDT)
Issued on. 2011-06-16
2011-11-01 implementation
Administration of Quality Supervision, Inspection and Quarantine of People's Republic of China
Standardization Administration of China released
Foreword
This standard uses the translation method identical with ISO 8534.2008 "Animal and vegetable fats Determination of water content Karl Fischer method (pyridine free)"
(In English).
For ease of use, the standard ISO 8534.2008 includes the following editorial changes.
--- Deleted international standards foreword;
--- The "this International Standard" by "this standard";
--- With a decimal point instead of the international standard as a decimal comma ",". ",";
--- Normative documents referenced by the current national standard GB/T 15687 instead of ISO 661, with the current national standard reference
GB/T 5524 instead of ISO 5555.
The Standard Appendix A, Appendix B is an informative annex.
The standard proposed by the National Food Authority.
This standard by the National Standardization Technical Committee OILS.
This standard is drafted by. Shandong Grain and Oil testing station.
Involved in the drafting of this standard. Nanjing University of Finance, Jinan Municipal Grain Bureau grain and oil quality inspection stations.
Drafters of this standard. Ren Lingyun, Yuan Jian, Hu Xuechun, Dishao Feng, Yang Xiaorong, Miss Barbara, Li Zhenhua, Liuli Ju, Wang Pei, Li Weike.
Introduction
Karl Fischer water determination of animal fat in two different ways. This standard details the Karl Fischer volumetric method, which applies
High water content samples (1mg ~ 100mg) for the determination.
Appendix B details the coulometric titration, which sensitivity is higher than the volumetric method for the determination of water content lower sample (10μg ~ 10mg).
Determination of the moisture content of animal fat
Karl Fischer method (pyridine free)
1 Scope
This standard specifies the animal fats (hereinafter referred to as oil) Karl Fischer water content measuring method in which the reagents without pyridine.
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.
GB/T 15687 animal and plant oils prepared sample (GB/T 15687-2008, ISO 661.2003, IDT)
3 Terms and definitions
The following terms and definitions apply to this standard.
3.1
Moisture content watercontent
100g grams of sample under the conditions specified in this standard are measured in the aqueous.
NOTE. moisture content expressed as a percentage by mass.
Principle 4
Grease with iodine and sulfur dioxide dissolved in the solution titration in the presence of water under conditions of sulfur dioxide iodine oxidation. In theory, react
Formula (1) chemical reactions.
H2O I2 SO2 CH3OH → 3RN "RNH" SO4CH3 2 "RNH" I (1)
Alcohol and sulfur dioxide and ammonia nitrogen base (RN) to form an intermediate methylsulfinyl sulfate, followed by iodine oxidation of methyl sulfate,
Oxidation reaction while consuming water in the sample, with the potential to end the monitoring.
5 Reagents
Warning. should comply with local regulations for handling hazardous substances. It should follow, organization and personal safety regulations technologies.
We recommend the use of "good preparation" solvent, one-component reagent (5.1.1) or a two-component reagent (5.1.2) can be. Karl Fischer reagent titration
= 0.10 1-2 milligrams per milliliter of water, the requirement for the titration.
5.1 Karl Fischer reagent
Capacity Fa Kaer Fischer reagent is divided into one-component and two-component reagents reagents.
5.1.1 Single-component reagents
All titration solution containing the desired reactants, i.e. iodine, sulfur dioxide and imidazole are dissolved in an appropriate alcohol solution, typically methanol as the working
As a solvent was added to the titration cell.
Optional absolute methanol as solvent, but the determination of oil should be used in anhydrous methanol was added anhydrous chloroform mixed solution (methanol content should be at least
25% by volume, preferably 50% by volume).
5.1.2 Two-component reagents
All reactions were required for the titration containing two different solutions. Only titrant containing iodine and methanol, and the titration cell of the working solution
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