GB 4806.12-2022 (GB4806.12-2022)

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GB 4806.12-2022: PDF in English

GB 4806.12-2022
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
National food safety standard - Bamboo and wood
materials and products for food contact
ISSUED ON: JUNE 30, 2022
IMPLEMENTED ON: DECEMBER 30, 2022
Issued by: National Health Commission of the PRC;
State Administration for Market Regulation.
Table of Contents
1 Scope ... 3 
2 Terms and definitions ... 3 
3 Basic requirements ... 3 
4 Technical requirements ... 3 
5 Other ... 5 
Appendix A Determination of sulfur dioxide migration in bamboo and wood materials
and products for food contact ... 6 
Appendix B Determination of thiabendazole, o-Phenylphenol, imazalil and biphenyl in
bamboo and wood materials and products for food contact ... 10 
National food safety standard - Bamboo and wood materials
and products for food contact
1 Scope
This Standard applies to bamboo and wood materials and products for food contact.
2 Terms and definitions
2.1 Bamboo and wood materials and products for food contact
A variety of materials and products made of bamboo, wood or cork wood that have been
or are expected to come into contact with food or food additives (hereinafter referred to
as food) under normal conditions of use, or whose components may be transferred to
food; including cork and plant fiberboard products, etc.
3 Basic requirements
Bamboo and wood materials and products for food contact shall comply with the
provisions of GB 4806.1.
4 Technical requirements
4.1 Raw material requirements
4.1.1 The raw materials used in bamboo and wood materials and products for food
contact shall not cause harm to human health.
4.1.2 The use of oil, wax and other additives in bamboo and wood materials and
products for food contact shall comply with the provisions of GB 9685 and relevant
announcements.
4.2 Sensory requirements
Sensory requirements shall meet the requirements of Table 1.
Appendix A
Determination of sulfur dioxide migration in bamboo and wood materials and
products for food contact
A.1 Principle
Select water as the food simulant. The specimen is subjected to migration test. The
sulfur dioxide in the specimen migrates to the water. In a closed device, acidify and
distill the test solution, to release the sulfur dioxide therein. Use lead acetate solution to
absorb the release. Use concentrated hydrochloric acid to acidify the absorbed solution;
use iodine standard solution to titrate. According to the consumed amount of iodine
standard solution, calculate the migration amount of sulfur dioxide in the specimen.
A.2 Reagents and materials
Carry out in accordance with Clause 3 of GB 31604.32-2016 first method (titration
method).
A.3 Instruments and equipment
Carry out in accordance with Clause 4 of GB 31604.32-2016 first method (titration
method); in which the iodine volumetric flask is changed to a pear-shaped flask; the all-
glass distillation device is shown in Figure A.1.
A.4 Analytical procedure
A.4.1 Preparation of food simulant test solution
According to the requirements of GB 5009.156 and GB 31604.1, select water as the
simulant; carry out the migration test on the sample; obtain the food simulant test
solution. During the migration test, the sample shall be prevented from being
contaminated by sulfur dioxide from other sources; and sealed to prevent the loss of
sulfur dioxide volatilization.
A.4.2 Preparation of blank test solution
According to the operation of A.4.1, handle the food simulant that is not in contact with
bamboo and wood materials and products.
A.4.3 Distillation
Measure 250 mL of the test solution obtained from the migration test; place it in a 500
mL round-bottom flask b (see Figure A.1). Add 250 mL of water to the round-bottom
Where:
X - The amount of sulfur dioxide migration in the specimen, in milligrams per kilogram
(mg/kg);
V1 - The volume of the iodine standard titration solution used in the titration of test
solution, in milliliters (mL);
V0 - The volume of the iodine standard titration solution used in the titration of blank
test solution, in milliliters (mL);
c - The concentration of iodine standard titration solution, in moles per liter (mol/L);
32 - The mass of sulfur dioxide equivalent to 1 L of iodine standard solution [( )=1.0
mol/L], in grams per mole (g/mol);
V2 - The volume of specimen soaking solution, in liters (L);
S1 - The contact area of specimen during testing, in square decimeters (dm2);
0.25 - The distillation volume of specimen solution, in liters (L);
S2 - The area of the specimen that actually contacts the food, in square decimeter (dm2);
m - The mass of the specimen actually in contact with solid food, or the food mass
corresponding to the volume actually in contact with liquid food, in kilograms (kg).
According to the density of 1 kg/L, the volume of various liquid foods is usually
converted into the corresponding mass.
Note: When the area-to-volume ratio of the specimen actually in contact with the food cannot be
determined, "S2/m" in the formula (A.1) shall be taken as 6 dm2/kg.
The calculation result retains three significant figures.
A.6 Precision
When the amount of sulfur dioxide migration is not higher than 5 mg/kg, the absolute
difference between two independent test results obtained under repeatability conditions
must not exceed 20% of the arithmetic mean. When the amount of sulfur dioxide
migration is higher than 5 mg/kg, the absolute difference between two independent test
results obtained under repeatability conditions must not exceed 10% of the arithmetic
mean.
Appendix B
Determination of thiabendazole, o-Phenylphenol, imazalil and biphenyl in
bamboo and wood materials and products for food contact
B.1 Principle
Take a representative sample; after crushing, use methanol to extract; rotary evaporate
to dryness. Use methanol to make up to volume; after filtering, use high-performance
liquid chromatograph equipped with diode array detector or UV detector for detection;
use external standard method to quantify.
B.2 Reagents and materials
B.2.1 Reagents
Unless otherwise specified, the reagents used are of analytical grade; the water is the
Grade 1 water specified in GB/T 6682.
B.2.1.1 Acetonitrile: Chromatographically pure.
B.2.1.2 Methanol: Chromatographically pure.
B.2.1.3 Phosphoric acid.
B.2.1.4 Sodium dodecyl sulfonate.
B.2.1.5 Mobile phase solution: Accurately weigh 0.681 g of sodium dodecyl sulfonate;
add 350 mL of methanol, 50 mL of acetonitrile, 100 mL of water and 1 mL of
phosphoric acid; mix well; and use after filtration.
B.2.2 Standards
B.2.2.1 Thiabendazole standard (C10H7N3S, CAS number: 148-79-8): Purity is ≥98%;
or a standard certified by the state and granted a reference material certificate.
B.2.2.2 o-Phenylphenol standard (C12H10O, CAS number: 90-43-7): Purity is ≥98%; or
a standard certified by the state and granted a reference material certificate.
B.2.2.3 Imazalil standard (C14H14Cl2N2O, CAS number: 35554-44-0): Purity is ≥98%;
or a standard certified by the state and granted a reference material certificate.
B.2.2.4 Biphenyl standard (C12H10, CAS number: 92-52-4): Purity is ≥98%; or a
standard certified by the state and granted a reference material certificate.
B.2.3 Preparation of standard solutions
B.2.3.1 Standard stock solutions (1000 mg/L): Accurately weigh 10 mg (accurate to 0.1
mg) of thiabendazole, o-Phenylphenol, imazalil and biphenyl standards respectively;
dissolve in methanol and transfer to 10 mL volumetric flasks respectively; use methanol
to dilute to the mark and mix well; store at 4 °C for a validity period of 3 months.
B.2.3.2 Mixed standard intermediate solution (50 mg/L): Respectively accurately
pipette 0.5 mL of standard stock solution (B.2.3.1) into 10 mL volumetric flask; use
methanol to dissolve and dilute to the mark and mix well; store at 4 °C for a validity
period of 1 month.
B.2.3.3 Standard working solutions: Respectively accurately PIPETTE 0.12 mL, 0.2
mL, 0.6 mL, 2 mL, 4 mL of the mixed standard intermediate solution (B.2.3.2) of
thiabendazole, o-Phenylphenol, imazalil and biphenyl INTO five 10 mL volumetric
flasks; use methanol to dissolve and dilute to the mark and mix well. Obtain standard
working solutions with concentrations of 0.6 mg/L, 1 mg/L, 3 mg/L, 10 mg/L and 20
mg/L of thiabendazole, o-Phenylphenol, imazalil and biphenyl. Prepare at the time of
use.
B.3 Instruments and equipment
B.3.1 High-performance liquid chromatograph: Equipped with diode array detector or
UV detector.
B.3.2 Analytical balance: The sensitivity is 0.1 mg and 0.01 g.
B.3.3 Ultrasonic generator.
B.3.4 Rotary evaporator.
B.3.5 0.45 μm nylon microporous filter membrane.
B.4 Analytical procedure
B.4.1 Specimen processing
For samples that can be directly cut with tools such as scissors and diagonal pliers, such
as chopsticks and steamers, directly use scissors and diagonal pliers, etc. to cut into
particles with a particle size of no more than 2.5 mm; put them in a clean container and
mix well.
For samples that are difficult to cut with scissors, such as thick chopping boards, etc., a
tool such as a saw blade or a chainsaw can be used to cut the representative parts into
small pieces. Then, use a tool such as scissors to cut into particles with a particle size
of no more than 2.5 mm; put them in a clean container and mix well. For samples that
are laminated or bonded between layers, when sampling, the sampling site shall contain
......
(Above excerpt was released on 2022-08-21, modified on 2022-08-21, translated/reviewed by: Wayne Zheng et al.)
Source: https://www.chinesestandard.net/PDF.aspx/GB4806.12-2022