GB/T 5532-2022_English: PDF (GB/T5532-2022)
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Animal and vegetable fats and oils -- Determination of iodine value
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Animal and vegetable fats and oils -- Determination of iodine value
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Vegetable oils--Determination of iodine value
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Inspection of vegetable oils--Methods for determination iodine value
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Standard ID | GB/T 5532-2022 (GB/T5532-2022) | Description (Translated English) | Animal and vegetable fats and oils -- Determination of iodine value | Sector / Industry | National Standard (Recommended) | Classification of Chinese Standard | X04 | Classification of International Standard | 67.040 | Word Count Estimation | 14,186 | Date of Issue | 2022-12-30 | Date of Implementation | 2023-07-01 | Older Standard (superseded by this standard) | GB/T 5532-2008 | Drafting Organization | Wuhan University of Light Industry, Wuhan Food and Cosmetics Inspection Institute, Scientific Research Institute of State Grain and Material Reserve Bureau, Wuhan Institute of Standardization, COFCO Fulinmen Food Marketing Co., Ltd., Yihai Kerry Arowana Grain and Oil Food Co., Ltd., COFCO Donghai Grain and Oil Industry (Zhangjiagang) Co., Ltd., COFCO Corporation | Administrative Organization | National Grain and Oil Standardization Technical Committee (SAC/TC 270) | Proposing organization | State Administration for Market Regulation, National Standardization Management Committee | Standard ID | GB/T 5532-2008 (GB/T5532-2008) | Description (Translated English) | Animal and vegetable fats and oils. Determination of iodine value | Sector / Industry | National Standard (Recommended) | Classification of Chinese Standard | X04 | Classification of International Standard | 67.040 | Word Count Estimation | 10,188 | Date of Issue | 2008-11-04 | Date of Implementation | 2009-01-01 | Older Standard (superseded by this standard) | GB/T 5532-1995 | Quoted Standard | GB/T 6682; GB/T 15687 | Adopted Standard | ISO 3961-1996, MOD | Drafting Organization | Wuhan Polytechnic University | Administrative Organization | National Standardization Technical Committee Agri | Regulation (derived from) | National Standard Approval Announcement 2008 No.17 (Total No.130) | Proposing organization | National Food Authority | Issuing agency(ies) | Administration of Quality Supervision, Inspection and Quarantine of People's Republic of China; Standardization Administration of China | Summary | This standard specifies the animal fats and vegetable oils (hereinafter referred to as " animal fat ") Determination of iodine value. | Standard ID | GB/T 5532-1995 (GB/T5532-1995) | Description (Translated English) | Vegetable oils--Determination of iodine value | Sector / Industry | National Standard (Recommended) | Classification of Chinese Standard | X14 | Classification of International Standard | 67.200.10 | Word Count Estimation | 5,532 | Date of Issue | 1995/8/17 | Date of Implementation | 1996/1/1 | Older Standard (superseded by this standard) | GB/T 5532-1985 | Adopted Standard | ISO 3961-1989, NEQ | Regulation (derived from) | Announcement of Newly Approved National Standards No. 17 of 2008 (No. 130 overall) | Proposing organization | People Republic of China Ministry of Internal Trade | Issuing agency(ies) | State Bureau of Technical Supervision |
GB/T 5532-2022
GB
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 67.040
CCS X 04
GB/T 5532-2022 / ISO 3961:2018
Replacing GB/T 5532-2008
Animal and vegetable fats and oils - Determination of iodine
value
(ISO 3961:2018, IDT)
ISSUED ON: DECEMBER 30, 2022
IMPLEMENTED ON: JULY 1, 2023
Issued by: State Administration for Market Regulation;
Standardization Administration of PRC.
Table of Contents
Foreword ... 3
1 Scope ... 5
2 Normative references ... 5
3 Terms and definitions ... 5
4 Principle ... 6
5 Reagents ... 6
6 Apparatus ... 7
7 Sampling ... 7
8 Preparation of the test sample and blank sample ... 7
9 Test procedure ... 8
10 Calculation of test data ... 9
11 Precision ... 10
12 Test report ... 10
Appendix A (Informative) Interlaboratory test results ... 12
Appendix B (Informative) Calculation method of iodine value (except fish oils) ... 16
References ... 20
Foreword
This document was drafted in accordance with the provisions of GB/T 1.1-2020
Directives for standardization - Part 1: Rules for the structure and drafting of
standardizing documents.
This document replaces GB/T 5532-2008 Animal and vegetable fats and oils -
Determination of iodine value. Compared with GB/T 5532-2008, except for the
structural adjustment and editorial changes, the main technical changes are as follows:
-- The requirement of mixing solvents by equal volume (50 mL) is added (see 5.5);
-- The storage method of Wijs reagent is added (see 5.6);
-- The instrument requirements for volumetric flasks, pipettes, and burettes are
added (see 6.4, 6.5, and 6.6);
-- Table 1 is changed (see Table 1; see Table 1 of the 2008 edition);
-- The requirements for preheating and sealing are added in the test procedure (see
9.1);
-- The requirements for rounding off the determination results are changed (see
Table 2; see Table 2 of the 2008 edition);
-- The contents that the requirement to indicate all necessary identification
information of the sample in the test report and the test method refers to the
international standard are added (see Chapter 12; see Chapter 12 of the 2008
edition).
This document is identical to ISO 3961:2018 Animal and vegetable fats and oils -
Determination of iodine value.
The following editorial changes have been made to this document:
-- The relevant formulas are numbered.
Please note that some of the contents of this document may involve patents. The issuing
agency of this document is not responsible for identifying patents.
This document was proposed by the National Food and Strategic Reserves
Administration.
This document shall be under the jurisdiction of the National Technical Committee on
Grains and Oils of Standardization Administration of China (SAC/TC270).
Animal and vegetable fats and oils - Determination of iodine
value
1 Scope
This document specifies a method for the determination of the iodine value of animal
and vegetable fats and oils.
Appendix B describes a method for the calculation of the iodine value according to fatty
acid compositional data. This method is not applicable to fish oils. Furthermore, for
cold-pressed, unrefined animal and vegetable oils as well as (partially) hydrogenated
oils, different results can be obtained by the two methods. The calculated iodine value
is affected by impurities and thermal degradation products.
NOTE: The method is based upon the official method Cd 1c-85 of American Oil Chemists Society
(AOCS).
2 Normative references
The following documents contain the provisions which, through normative reference in
this document, constitute the essential provisions of this document. For the dated
referenced documents, only the versions with the indicated dates are applicable to this
document; for the undated referenced documents, only the latest version (including all
the amendments) is applicable to this document.
ISO 661 Animal and vegetable fats and oils - Preparation of test sample
NOTE: GB/T 15687-2008 Animal and vegetable fats and oils - Preparation of test sample (ISO
661:2003, IDT)
3 Terms and definitions
The following terms and definitions are applicable to this document.
The terminological databases of ISO and IEC can be accessed at the following URL:
-- ISO: https://www.iso.org/obp
-- IEC: http://www.electropedia.org/
3.1 iodine value
The mass of halogen absorbed by a sample of a certain mass under the operating
conditions specified in this document.
NOTE: It is expressed as the grams of iodine absorbed per 100 g of fat.
4 Principle
The sample is dissolved in solvent and then Wijs reagent is added for reaction. After a
specified time, potassium iodide and water are added, and then the solution is titrated
with sodium thiosulfate solution to obtain free iodine.
5 Reagents
WARNING -- Attention is drawn to the regulations that specify the handling of
hazardous substances. The relevant technical, organizational, and personal safety
regulations shall be followed. Wijs reagent may cause severe burns; vapours can
cause lung and eye damage. A fume hood shall be used for the work.
5.1 Unless otherwise stated, all reagents used in this document are of analytical grade.
The water shall meet the relevant grade regulations.
5.2 Potassium iodide solution (KI): 100 g/L, not containing iodate or free iodine.
5.3 Starch solution: Mix 5 g of soluble starch in 30 mL of water, add 1000 mL of boiling
water, boil for 3 min, and cool it. Prepare fresh starch solution every day.
5.4 Sodium thiosulfate standard solution: c(Na2S2O3 • 5H2O)=0.1 mol/L, standardized
not more than 7 days before use.
5.5 Solvent: It is prepared by mixing one volume of cyclohexane (50 mL) and one
volume of glacial acetic acid (50 mL), volume fractions φ=50 mL/100 mL.
5.6 Wijs reagent: It is acetic acid containing iodine monochloride. The iodine/chlorine
ratio of the Wijs reagent shall be within the limits of 1.10±0.1. Wijs reagent is sensitive
to temperature, moisture, and light, thus it shall be stored in a brown bottle below 30 °C
and protected from light.
The commercially available Wijs reagent can be used, and the reagent shall be ensured
within the shelf life.
......
GB/T 5532-2008
Animal and vegetable fats and oils. Determination of iodine value
ICS 67.040
X04
National Standards of People's Republic of China
Replacing GB/T 5532-1995
Determination of iodine value of animal fat
(ISO 3961.1996, MOD)
Posted 2008-11-04
2009-01-01 implementation
Administration of Quality Supervision, Inspection and Quarantine of People's Republic of China
Standardization Administration of China released
Foreword
This revised standard adopts the International Standard ISO 3961.1996 "Animal and vegetable fats Determination of iodine value" (in English).
This standard and ISO 3961.1996 compared to major differences are.
--- Laboratory analysis of water required by the GB/T 6682 (GB/T 6682-2008, ISO 3698. 1987, MOD);
--- Oil sample preparation required by the GB/T 15687 (GB/T 15687-1995, eqv ISO 661. 1989).
For ease of use, this standard the following editorial changes.
--- Delete foreword international standards;
--- The "this International Standard" by "this standard";
--- With a decimal point as a decimal point instead of the original ",". ",";
--- The relevant formulas are numbered.
This standard replaces GB/T 5532-1995 "Determination of iodine value of vegetable oil."
The main changes compared to 5532-1995 standard and GB/T as follows.
--- Modify the method of preparation Webster (Wijs) reagents;
--- Increased requirements for sampling;
--- Modify the sample weight requirements;
--- Modify the value of the measurement results of the requirements;
--- Modify the precision requirements.
Appendix A of this standard 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. Wuhan Polytechnic.
Drafters of this standard. LiuLiangZhong, Dongping, Zhang Shihong.
This standard replaces the standards previously issued as follows.
--- GB/T 5532-1995.
Determination of iodine value of animal fat
1 Scope
This standard specifies the animal fats and vegetable oils (hereinafter referred to as "animal fat") method for measuring iodine value.
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, according to research encourages the parties to the agreement
Study whether the latest versions of these documents. For undated reference documents, the latest versions apply to this standard.
GB/T 6682 analytical laboratory use specifications and test methods (GB/T 6682-2008, ISO 3696. 1987, MOD)
GB/T 15687 grease sample preparation (GB/T 15687-1995, eqv ISO 661. 1989)
3 Terms and Definitions
The following terms and definitions apply to this standard.
3.1
Samples certain quality absorbent quality halogen under this standard operating conditions. The number of grams of fat per 100g with the absorption of iodine
FIG.
Principle 4
After the sample is first dissolved in a solvent, adding Webster (the Wijs) reagent certain time, potassium iodide and water was added, dropwise with a solution of sodium thiosulfate
Given precipitated iodine.
5 Reagents
Unless otherwise indicated, the reagents used were of analytical grade standard, the water should be consistent with GB/T 6682 in the three water requirements.
5.1 potassium iodide solution (KI). 100g/L, contains no iodine salts or free iodine.
5.2 starch solution. 5g of soluble starch in 30mL water, wherein the added 1000mL boiling water, and boiled for 3min, then cooled.
5.3 sodium thiosulfate standard solution. Ba (Na2S2O3 · 5H2O) = 0.1mol/L, use within 7d after calibration.
5.4 solvent. cyclohexane and glacial acetic acid mixed in equal volumes.
5.5 Webster (Wijs) Reagents. acetic acid solution containing iodine monochloride. Webster (Wijs) reagent I/Cl ratio shall be controlled at 1.10 ± 0.1 in
Range.
Acetic acid preparation containing iodine monochloride method may be dissolved in 1500mL 25g of iodine monochloride in glacial acetic acid. Webster (Wijs) reagent stability
Poor qualitative, to enable accurate measurement results should be done in the blank control assay.
Formulated Webster (Wijs) of glacial acetic acid reagent shall meet the quality requirements, and shall not contain reducing substances.
Identification contain reducing substances methods.
Glacial acetic acid taken 2mL, plus 10mL distilled water was added 1mol/L potassium permanganate 0.1mL, it should be presented in a color 2h
constant. If the red fade, indicating the presence of reducing substances.
Available refined as follows.
Take 800mL of glacial acetic acid into the round bottom flask was added 8g ~ 10g potassium permanganate, connected to a reflux condenser, was heated at reflux for about 1h, shift
......
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