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GB 31604.47-2016 English PDF (GB31604.47-2016)

GB 31604.47-2016 English PDF (GB31604.47-2016)

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GB 31604.47-2016: Food contact materials for export -- Paper and paper products -- Determination of fluorescent brightener -- Liquid chromatography

This Standard specifies the method for the determination of fluorescent brighter in food-contact paper, paperboards and paper products. This Standard applies to the determination of fluorescent brighter in food-contact paper, paperboards and paper products.
GB 31604.47-2016
GB
NATIONAL STANDARD OF THE
PEOPLE REPUBLIC OF CHINA
National Food Safety Standard ?€? Food Contact Materials
and Articles ?€? Determination of Fluorescent Brightener in
Paper, Paperboards and Paper Products
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ISSUED ON. SEPTEMBER 19, 2016
IMPLEMENTED ON. APRIL 19, 2017
Issued by. National Health and Family Planning Commission of the
PEOPLE Republic of China
3. No action is required - Full-copy of this standard will be automatically & immediately delivered to your EMAIL address in 0~60 minutes.
Table of Contents
Foreword ... 3
1 Application Scope ... 4
2 Principle ... 4
3 Reagents and Materials ... 4
4 Apparatus ... 5
5 Analytical Procedure ... 6
6 Expression of Analytical Results ... 8
Foreword
This Standard replaces the fluorescent substance testing part of GB/T 5009.78-2003, Method for Analysis of Hygienic Standard of Papers for Food Packaging, and SN/T 2901-2011, Food Contact Materials for Export ?€? Determination of Fluorescent Brighter in Paper and Paper Products - Liquid Chromatography.
Compared with GB/T 5009.78, the major changes of this Standard are as follows. -- it changes the standard name into ?€?National Food Safety Standard ?€? Food Contact Materials and Articles ?€? Determination of Fluorescent Brightener in Paper, Paperboards and Paper Products?€?;
-- it adds confirmatory test;
-- it adds application scope.
National Food Safety Standard ?€? Food Contact Materials
and Articles ?€? Determination of Fluorescent Brightener in
Paper, Paperboards and Paper Products
1 Application Scope
This Standard specifies the method for the determination of fluorescent brighter in food-contact paper, paperboards and paper products.
This Standard applies to the determination of fluorescent brighter in food-contact paper, paperboards and paper products.
2 Principle
After fluorescent brighter absorbs near ultraviolet light (of wavelength 300 nm ~ 400 nm), the electrons in molecules transition from the ground state, return to the ground state within extremely short time and give off blue or violet fluorescent light (of wavelength 420 nm ~ 480 nm). Therefore, it is determined whether specimen contains fluorescent brighter through observation of whether specimen has fluorescence under the irradiation of an ultraviolet lamp of wavelength 365 nm. If specimen shows multiple discontinuous small fluorescence spots or specimen has fluorescence but not conspicuous, extract with an alkaline extracting solution, adjust the extracting solution to acidity, use gauze to absorb fluorescent brighter in the extracting solution, and observe whether the gauze has conspicuous fluorescent light under an ultraviolet lamp of wavelength 365 nm in order to confirm whether specimen contains fluorescent brighter.
3 Reagents and Materials
Unless specified otherwise, all reagents used for this method are analytically pure and the water is of grade 1 water specified in GB/T 6682. All reagents and materials used shall have no fluorescent light under an ultraviolet lamp.
3.1 Reagents
3.1.1 Acetonitrile (CH3CN). chromatographically pure.
3.1.2 Triethylamine [(CH3CH2)3N].
In a dark room or dark box, turn on the power switch of ultraviolet lamp and choose the test wavelength of 365 nm. Placed the test pieces of 100 cm2 prepared about 20 cm from the ultraviolet light source; observe whether they have conspicuous blue or violet fluorescent light. If specimen shows multiple discontinuous small fluorescence spots or specimen has fluorescence but not conspicuous, it requires the execution of the operating steps specified in 5.3 for confirmatory test.
5.3 Confirmation of fluorescent brighter
5.3.1 Preparation of standard control gauze
Weigh 2.0 g (accurate to 1 mg) of blank paper specimen pulverized uniformly in the operating step of 5.1 to place into a 250 mL conical flask; add 0.5 mL of 40.0 ??g/mL C.I.220 standard solution, equivalent to that the content of C.I.220 in paper specimen is 10 mg/kg; add 100 mL of alkaline extracting solution (of volume ratio of acetonitrile, water and triethylamine 40.60.1) under dark conditions (of illuminance less than 20 Lux required); perform supersonic extraction for 40 min at 50??C. Cool to room temperature after the completion of extraction; filter the extracting solution through a glass funnel containing a small amount of glass wool (no fluorescent brighter contained) to a chicken-shaped flask or obtain clarified extracting solution by centrifugation (for 5 min at the rotational speed of 3 500 r/min). Perform vacuum concentration of the extracting solution to about 40 mL ~ 50 mL at 50??C; transfer the concentrated solution to a 250 mL beaker; after using water to wash the chicken-shaped flask, transfer to a 250 mL beaker along with washings; use hydrochloric acid (of volume fraction 10%) to adjust the pH value to 3 ~ 5; add water dropwise to about 100 mL. Then immerse one piece of gauze of 5 cm ?? 5 cm in the extracting solution and absorb on a water bath for 30 min at 40??C. Use tweezers to take out the gauze; use hand to squeeze out most of liquid; fold the gauze into 4 layers with the area of each layer 2.5 cm ?? 2.5 cm; place on a watch glass.
5.3.2 Specimen extraction and absorption
Weigh 2.0 g (accurate to 1.0 mg) of specimen pulverized uniformly in the operating step of 5.1 to place into a 250 mL conical flask; the other operating steps are as specified in the step of 5.3.1, ?€?add 100 mL of alkaline extracting solution (of volume fraction of acetonitrile, water and triethylamine 40.60.1) under dark conditions (of illuminance less than 20 Lux required) ... place on a watch glass?€?. Two parallel tests shall be performed for each specimen.
5.3.3 Blank test
Use 2.0 g of water to replace specimen and perform tests in accordance with the operating steps of 5.3.2.
5.3.4 Determination of fluorescent brighter
In a dark room or dark box, turn on the power switch of ultraviolet lamp and choose the test wavelength of 365 nm. Placed the watch glasses of standard control gauze,

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