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
Chinese Name:	食品安全国家标准 食品接触材料及制品 纸、纸板及纸制品中荧光增白剂的测定
Professional Classification:	GB    National Standard
Issued by:	National Health and Family Planning Commission
Issued on:	2016-10-19
Implemented on:	2017-4-19
Status:	valid
Superseding:	GB/T 5009.78-2003 Method for analysis of hygienic standard of papers for food packaging SN/T 2901-2011
Language:	English
File Format:	PDF
Word Count:	2000 words
Price(USD):	40.0
Delivery:	via email in 1 business day

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