GB 31604.47-2016 National Food Safety Standard - Food Contact Materials and Articles -Determination of Fluorescent Brightener in Paper, Paperboards and Paper Products (English Version)
1 Scope
This Standard specifies methods of determination for flourescent brightener in paper, paper boards and paper products for food.
This Standard is applicable to determination for flourescent brightener in paper, paper boards and paper products for food.
2 Principle
After flourescent brightener absorbs black light (with wavelength of 300 nm ~ 400 nm), the electrons in flourescent brightener molecules transit from the ground state, and back to the ground state in an extremely short time, transmitting blue or violet fluorescence (with wavelength of 420 nm ~ 480 nm). Therefore, by observing the specimen under 365nm ultraviolet lamp whether there is an obvious fluorescence phenomenon, carry out the qualitative determination for flourescent brightener in specimen or not. If the specimen shows multiple discontinuous fleck fluorescence or has fluorescence phenomena but obscure, extract with alkali extract, adjust the extract to be acid; with gauze, adsorb flourescent brightener in the extract; observe the gauze under 365 nm ultraviolet lamp and confirm whether there is flourescent brightener in the specimen.
3 Reagents and Materials
Foreword i
1 Scope
2 Principle
3 Reagents and Materials
4 Instruments and Apparatus
5 Analysis Steps
6 Judgment of Results
Standard
GB 31604.47-2016 National Food Safety Standard - Food Contact Materials and Articles -Determination of Fluorescent Brightener in Paper, Paperboards and Paper Products (English Version)
Standard No.
GB 31604.47-2016
Status
valid
Language
English
File Format
PDF
Word Count
2000 words
Price(USD)
40.0
Implemented on
2017-4-19
Delivery
via email in 1 business day
Detail of GB 31604.47-2016
Standard No.
GB 31604.47-2016
English Name
National Food Safety Standard - Food Contact Materials and Articles -Determination of Fluorescent Brightener in Paper, Paperboards and Paper Products
1 Scope
This Standard specifies methods of determination for flourescent brightener in paper, paper boards and paper products for food.
This Standard is applicable to determination for flourescent brightener in paper, paper boards and paper products for food.
2 Principle
After flourescent brightener absorbs black light (with wavelength of 300 nm ~ 400 nm), the electrons in flourescent brightener molecules transit from the ground state, and back to the ground state in an extremely short time, transmitting blue or violet fluorescence (with wavelength of 420 nm ~ 480 nm). Therefore, by observing the specimen under 365nm ultraviolet lamp whether there is an obvious fluorescence phenomenon, carry out the qualitative determination for flourescent brightener in specimen or not. If the specimen shows multiple discontinuous fleck fluorescence or has fluorescence phenomena but obscure, extract with alkali extract, adjust the extract to be acid; with gauze, adsorb flourescent brightener in the extract; observe the gauze under 365 nm ultraviolet lamp and confirm whether there is flourescent brightener in the specimen.
3 Reagents and Materials
Contents of GB 31604.47-2016
Foreword i
1 Scope
2 Principle
3 Reagents and Materials
4 Instruments and Apparatus
5 Analysis Steps
6 Judgment of Results