GB/T 5009.58-2003 Analytical methods for hygienic standards of polyethylene resins for food packaging

This standard specifies the determination methods of various hygienic indicators of polyethylene resin raw materials used to make tableware, food containers, food packaging films or other food tools. This standard is applicable to the determination of various hygienic indicators of polyethylene resin raw materials used to make tableware, containers, food packaging films or other food tools. GB/T 5009.58-2003 Analysis methods for hygienic standards of polyethylene resins for food packaging GB/T5009.58-2003 Standard download decompression password: www.bzxz.net

ICS67.040
National Standard of the People's Republic of China
GB/T5009.58—2003
Replaces GB/T5009.58—1996
Method for analysis of hygienic standard of polyethylene resin for food packaging
Promulgated on August 11, 2003
Ministry of Health of the People's Republic of China
Standardization Administration of the People's Republic of China
Implementation on January 1, 2004
GB/T5009.58—2003
This standard replaces GB/T5009.58—1996 "Method for analysis of hygienic standard of polyethylene resin for food packaging". Compared with GB/T5009.58-1996, this standard has been modified as follows: The structure of the original standard has been modified in accordance with GB/T20001.4-2001 "Standard Preparation Rules Part 4: Chemical Analysis Methods".
This standard is proposed and managed by the Ministry of Health of the People's Republic of China. This standard is drafted by the Shanghai Municipal Health and Epidemic Prevention Station. This standard was first issued in 1985 and revised for the first time in 1996. This is the second revision. 464
1 Scope
Analysis methods for hygienic standards of polyethylene resins for food packaging
GB/T5009.58-2003
This standard specifies the determination methods for various hygienic indicators of polyethylene resin raw materials for making tableware, food containers, food packaging films or other food tools.
This standard is applicable to the determination of various hygienic indicators of polyethylene resin raw materials for making tableware, containers, food packaging films or other food tools.
2 Sampling method
10% of the number of packages in each batch shall be sampled, and the number of small batches shall not be less than 3 packages. From the selected number of packages, use sampling tools such as sampling needles to extend into 3/4 of the depth of each package to take samples, and the total amount of samples taken shall not be less than 2kg. The samples shall be quickly mixed and divided into 500g portions by quartering method, and placed in two clean and dry 250mL glass stoppered wide-mouth bottles. Labels shall be attached to the bottles, indicating the manufacturer's name, product name, batch number and sampling date. One bottle shall be sent to the laboratory for analysis, and the other bottle shall be sealed and stored for two months for arbitration analysis. 3 Loss on drying
3.1 Principle
The mass lost by drying the sample at 90℃～95℃ is the loss on drying, which indicates the presence of volatile substances. 3.2 Analysis steps
Weigh 5.00g~10.00g of sample and place it in a flat weighing bottle with constant weight, the thickness should not exceed 5mm, then dry it at 90℃~95℃ for 2h, place it in a dryer for 30min and weigh it. The drying loss should not exceed 0.15g/100g. 3.3 Result calculation
See formula (1).
X=mi-m2×100
Where:
X——the drying loss of the sample, in grams per hundred grams (g/100g); m
the mass of the sample plus the weighing bottle, in grams (g); the mass of the sample after the weighing bottle is constant, in grams (g); ms—the mass of the sample, in grams (g). The calculation result should retain three significant figures.
3.4 ​​Precision
The absolute difference between two independent determination results obtained under repeatability conditions shall not exceed 20% of the arithmetic mean. 4 Ignition residue
4.1 Principle
The residue after the sample is ignited at 800℃ indicates the inorganic contamination situation. 4.2 Analysis steps
Weigh 5.0g~10.0g of sample, put it in a crucible that has been ignited at 800℃ to a constant weight, first carefully carbonize it, then put it in a high-temperature furnace at 800℃ and ignite it for 2h, take it out after cooling, put it in a dryer to cool for 30min, weigh it, then put it in a muffle furnace, ignite it at 80℃ for 30min, cool it and weigh it, 465
GB/T5009.58—2003
until the difference between the two weighings does not exceed 2.0mg. 4.3 Result calculation
See formula (2).
Where:
X= mlm2×100
Ignition residue of the sample, in grams per hundred grams (g/100g); mass of the crucible with residue, in grams (g); mass of the empty crucible, in grams (g);
mass of the sample, in grams (g).
The calculation result shall be rounded to three significant figures.
4.4 Precision
The absolute difference between two independent determination results obtained under repeatability conditions shall not exceed 20% of the arithmetic mean. 5 n-hexane extract
5.1 Principle
The substance extracted from the sample by n-hexane represents the substance that can be leached out by oil. 5.2 Instrument
5.2.1250mL all-glass reflux condenser. 5.2.2 Concentrator.
5.3 Analysis steps
Weigh about 1.00g~2.00g sample (about 50~100 grains) into a flask with a 250mL reflux condenser, add 100mL of n-hexane, connect the condenser, heat and reflux in a water bath for 2h, filter immediately with a fast qualitative filter paper, wash the filter and sample with a small amount of n-hexane, and combine the washing liquid with the filtrate. Pour the n-hexane into a small bottle of a constant-volume concentrator, concentrate and recover the n-hexane, dry the residue at 100℃~105℃ for 2h, cool in a desiccator for 30min, and weigh. The n-hexane extract shall not exceed 2%. 5.4 Calculation of results
See formula (3).
Wherein:
-n-hexane extract in the sample, in grams per 100 grams (g/100g); the mass of the residue plus the vial of the concentrator, in grams (g); the mass of the vial of the concentrator, in grams (g): the mass of the sample, in grams (g).
The calculation result shall retain three significant figures. bZxz.net
5.5 Precision
The absolute difference between two independent determination results obtained under repeatability conditions shall not exceed 5% of the arithmetic mean. 466
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