GB 31604.47-2023 PDF English
US$140.00 · In stock · Download in 9 secondsGB 31604.47-2023: National food safety standard - Food contact materials and products - Determination of fluorescent substances in paper, paperboard and paper products Delivery: 9 seconds. True-PDF full-copy in English & invoice will be downloaded + auto-delivered via email. See step-by-step procedureStatus: Valid GB 31604.47: Evolution and historical versions
| Standard ID | Contents [version] | USD | STEP2 | [PDF] delivery | Name of Chinese Standard | Status |
| GB 31604.47-2023 | English | 140 |
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National food safety standard - Food contact materials and products - Determination of fluorescent substances in paper, paperboard and paper products
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| GB 31604.47-2016 | English | 70 |
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Food contact materials for export -- Paper and paper products -- Determination of fluorescent brightener -- Liquid chromatography
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GB 31604.47-2023: National food safety standard - Food contact materials and products - Determination of fluorescent substances in paper, paperboard and paper products
---This is an excerpt. Full copy of true-PDF in English version (including equations, symbols, images, flow-chart, tables, and figures etc.), auto-downloaded/delivered in 9 seconds, can be purchased online: https://www.ChineseStandard.net/PDF.aspx/GB31604.47-2023
GB
NATIONAL STANDARD OF THE
PEOPLE'S REPUBLIC OF CHINA
National food safety standard - Food contact materials and
products - Determination of fluorescent substances in paper,
cardboard and paper products
Issued on. SEPTEMBER 6, 2023
Implemented on. MARCH 6, 2024
Issued by. National Health Commission of the People's Republic of China;
State Administration for Market Regulation.
Table of Contents
Foreword... 3
1 Scope... 4
2 Principle... 4
3 Reagents and materials... 4
4 Instruments and equipment... 5
5 Analysis steps... 6
Foreword
This standard replaces GB 31604.47-2016 National food safety standard - Food contact
materials and products - Determination of fluorescent substances in paper, cardboard
and paper products.
Compared with GB 31604.47-2016, the main changes in this standard are as follows.
-- The name of the standard is modified to "National food safety standard - Food
contact materials and products - Determination of fluorescent substances in
paper, cardboard and paper products";
-- The detection wavelength of 254 nm is added;
-- The description of the function of standard control gauze is added;
-- The presentation of result determination is modified.
National food safety standard - Food contact materials and
products - Determination of fluorescent substances in paper,
cardboard and paper products
1 Scope
This standard specifies the method for the determination of fluorescent substances in
food contact paper, cardboard, and paper products.
This standard is applicable to the determination of fluorescent substances in food
contact paper, cardboard, and paper products.
2 Principle
Whether the sample contains fluorescent substances is determined by directly observing
under UV light whether there is an obvious fluorescence phenomenon (that is, obvious
blue or purple fluorescence) in food contact paper, cardboard, and paper product
samples. If there are many discontinuous small spots of fluorescence in the sample or
the fluorescence phenomenon is not obvious, it is extracted with an alkaline extracting
solution, then the extract is acidified, and gauze is used to absorb the fluorescent
substances in the extract; under irradiation with the ultraviolet light, the gauze is
observed whether there is obvious fluorescence phenomenon to confirm whether the
sample contains fluorescent substances.
3 Reagents and materials
Unless otherwise stated, all reagents used are of analytical grade and the water is first-
grade water specified in GB/T 6682.All reagents and materials used shall have no
fluorescence under UV light.
3.1 Reagents
3.2 Reagent preparation
3.2.1 Hydrochloric acid solution (1+9). Mix hydrochloric acid and water in a volume
ratio of 1.9.
3.3 Standard products
Fluorescent whitening agent 220 (C40H40N12O16S4Na4, referred to as C.I.220, CAS
number. 16470-24-9). the purity of ≥95%, or a standard product with national
certification and a Reference Material Certificate.
3.4 Preparation of standard solution
3.5 Materials
3.5.1 Gauze.
3.5.2 Glass wool.
4 Instruments and equipment
All instruments and equipment that are in direct contact with the sample shall have no
fluorescence under ultraviolet light.
4.1 UV lamp. The wavelength is 365 nm and 254 nm.
4.2 Scissors.
4.3 Right-angled triangle.
4.4 Ultrasonic cleaner.
4.9 Analytical balance. The sensitivity is 1 mg and 0.1 mg, respectively.
4.10 Chicken heart bottle. 250 mL.
4.11 Erlenmeyer flask with stopper. 250 mL.
4.12 Glass funnel.
4.13 Glass watch glass.
4.14 Tray.
4.15 Centrifuge. The rotating speed is ≥3500 r/min.
5 Analysis steps
5.1 Sample preparation
5.1.1 Sample preparation for direct measurement of fluorescent substances
For food contact paper and cardboard, such as food packaging paper, candy paper, and
popsicle paper, use scissors and a right-angled triangle to cut it into a size of 10 cm×10
cm or 100 cm2.If the sample area is less than 100 cm2, then cut the samples of the same
batch at the same position so that the total area reaches 100 cm2.According to the above
operation, randomly sample from this batch of products and cut out 5 samples with an
area of 100 cm2 to be tested.
5.1.2 Sample preparation when confirmation of fluorescent substances is required
For samples that require confirmation testing, weigh 10 g (accurate to 1 mg) of the
sample, cut into paper scraps of approximately 5 mm×5 mm, and then crush them into
cotton wool with a high-speed pulverizer for later use.
5.2 Direct measurement of fluorescent substances and judgment of results
In a darkroom or dark box, place the 100 cm2 sample cut according to 5.1.1 about 20
cm below the UV light source, turn on the power switch of the UV lamp, select the
detection wavelengths of 254 nm and 365 nm respectively, and directly observe whether
fluorescence phenomenon appears on the sample.
5.3 Confirmation of fluorescent substances
5.3.1 Preparation of non-fluorescent gauze
Use scissors and a right-angled triangle to cut out several pieces of gauze about 5 cm×5
cm in size.
5.3.2 Preparation of standard control gauze
Weigh 2.0 g of the uniformly crushed blank sample prepared according to 5.1.2
(accurate to 1 mg) into a 250 mL Erlenmeyer flask, add 0.5 mL of standard working
solution (40.0 mg/L), then place in a dark place (the illumination is required to be less
than 20 lx), add 100 mL of alkaline extracting solution, and conduct ultrasonic
extraction at 50 °C for 40 minutes.
5.3.5 Confirmatory test for fluorescent substances
In a darkroom or dark box, place the watch glass containing the standard control gauze,
blank sample gauze, and two parallel sample gauze about 20 cm below the UV light
source, turn on the power switch of the UV lamp, then select the detection wavelength
of 254 nm and 365 nm respectively, and observe directly.
5.3.6 Determination of confirmation test results of fluorescent substances
At the two wavelengths of 254 nm and 365 nm, if there is no obvious fluorescence
phenomenon in the two parallel sample gauze (that is, no obvious blue or purple
fluorescence), the fluorescent substance in the sample is judged to be negative; if two
parallel sample gauze both have obvious fluorescence phenomenon, the fluorescent
substance in the sample is judged to be positive; if only one parallel sample gauze has
obvious fluorescence phenomenon, it is necessary to carry out the parallel test of two
samples again.
......
Source: Above contents are excerpted from the full-copy PDF -- translated/reviewed by: www.ChineseStandard.net / Wayne Zheng et al.
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