GB 31604.32-2016 National Food Safety Standard - Food Contact Materials and Articles -Determination of Sulfur Dioxide in Wood Materials (English Version)
1 Scope
This standard specifies determination methods, i.e., titrimetric method and colorimetry, of sulfur dioxide in food contact wood (bamboo) materials.
This standard is applicable to determination of sulfur dioxide in chopsticks, bowls, spoons and spatula which are made of wood (bamboo).
Method I Titration
2 Principle
Acidize, heat and distill the specimen in closed container to release the sulfur dioxide in it, then absorb the released substance with lead acetate solution. After absorption, acidize with concentrated hydrochloric acid, carry out titration with iodum standard solution, then work out the sulfur dioxide content in the specimen according to the amount of the consumed iodum standard solution.
3 Reagents and Materials
Unless otherwise specified, analytically-pure reagents and Class-III water (defined in GB/T 6682) are adopted for the purpose of this method.
3.1 Reagents
3.1.1 Hydrochloric acid (HCl).
3.1.2 Lead acetate [Pb(CH3COO)2•3H2O].
3.1.3 Iodine (I2).
3.1.4 Soluble starch [(C6H10O5)n].
3.2 Preparation of reagents
Foreword i
1 Scope
2 Principle
3 Reagents and Materials
4 Instruments and Apparatus
5 Analysis Steps
6 Expression of Analysis Results
7 Accuracy
8 Others
9 Principle
10 Reagents and Materials
11 Instruments and Apparatus
12 Analysis Steps
13 Expression of Analysis Results
14 Accuracy
15 Others
Annex A Preparation of Sulfur Dioxide Standard Solution
GB 31604.32-2016 National Food Safety Standard - Food Contact Materials and Articles -Determination of Sulfur Dioxide in Wood Materials (English Version)
Standard No.
GB 31604.32-2016
Status
valid
Language
English
File Format
PDF
Word Count
3000 words
Price(USD)
60.0
Implemented on
2017-4-19
Delivery
via email in 1 business day
Detail of GB 31604.32-2016
Standard No.
GB 31604.32-2016
English Name
National Food Safety Standard - Food Contact Materials and Articles -Determination of Sulfur Dioxide in Wood Materials
1 Scope
This standard specifies determination methods, i.e., titrimetric method and colorimetry, of sulfur dioxide in food contact wood (bamboo) materials.
This standard is applicable to determination of sulfur dioxide in chopsticks, bowls, spoons and spatula which are made of wood (bamboo).
Method I Titration
2 Principle
Acidize, heat and distill the specimen in closed container to release the sulfur dioxide in it, then absorb the released substance with lead acetate solution. After absorption, acidize with concentrated hydrochloric acid, carry out titration with iodum standard solution, then work out the sulfur dioxide content in the specimen according to the amount of the consumed iodum standard solution.
3 Reagents and Materials
Unless otherwise specified, analytically-pure reagents and Class-III water (defined in GB/T 6682) are adopted for the purpose of this method.
3.1 Reagents
3.1.1 Hydrochloric acid (HCl).
3.1.2 Lead acetate [Pb(CH3COO)2•3H2O].
3.1.3 Iodine (I2).
3.1.4 Soluble starch [(C6H10O5)n].
3.2 Preparation of reagents
Contents of GB 31604.32-2016
Foreword i
1 Scope
2 Principle
3 Reagents and Materials
4 Instruments and Apparatus
5 Analysis Steps
6 Expression of Analysis Results
7 Accuracy
8 Others
9 Principle
10 Reagents and Materials
11 Instruments and Apparatus
12 Analysis Steps
13 Expression of Analysis Results
14 Accuracy
15 Others
Annex A Preparation of Sulfur Dioxide Standard Solution