This standard specifies the determination methods of various hygienic indicators of food containers, tableware and food packaging films made of polyethylene, polystyrene and polypropylene. This standard is applicable to the determination of various hygienic indicators of various tableware, containers and food packaging films or other various food tools, pipes and other products made of polyethylene, polystyrene and polypropylene as raw materials. GB/T 5009.60-2003 Analysis methods for hygienic standards of polyethylene, polystyrene and polypropylene molded products for food packaging GB/T5009.60-2003 standard download decompression password: www.bzxz.net

ICS67.040
National Standard of the People's Republic of China
GB/T5009.60--2003
Replaces GB/T5009.60-1996
Method for analysis of hygienic standard of products of polyethylene, polystyrene and polypropyrene 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/T5009.60—2003
This standard replaces GB/T5009.60—1996 "Method for analysis of hygienic standard of products of polyethylene, polystyrene and polypropyrene for food packaging".
Compared with GB/T5009.60—1996, the main modifications of this standard are as follows: The structure of the original standard has been modified according to 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. 474
1 Scope
Analysis methods for hygienic standards of polyethylene, polystyrene and polypropylene molded products for food packaging GB/T5009.60-—2003
This standard specifies the determination methods for various hygienic indicators of food containers, tableware and food packaging films made of polyethylene, polystyrene and polypropylene as raw materials.
This standard applies to the determination of various hygienic indicators in various tableware, containers, food packaging films or other various food tools, pipes and other products made of polyethylene, polystyrene and polypropylene as raw materials. 2 Sampling method
Take samples at 0.1% of each batch. For small batches, the number of samples shall not be less than 10 (500mL volume/piece. When less than 500mL/piece, the sample volume shall be doubled accordingly). Half of them are used for testing, and the other half are kept for two months for arbitration analysis. The product name, batch number and sampling date are marked respectively. Wash the samples for use. 3 Soaking conditions
3.1 Water: 60℃, soak for 2h.
3.2 Acetic acid (4%): 60℃, soak for 2h. 3.3 Ethanol (65%): room temperature, soak for 2h. 3.4 n-hexane: room temperature, soak for 2h.
Add 2mL of the above soaking solution per square centimeter of contact area, and add soaking solution to the container until the volume is 2/3~4/5. 4 Potassium permanganate consumption
4.1 Principle
After the sample is soaked in the soaking solution, its potassium permanganate consumption is measured to indicate the content of soluble organic matter. 4.2 Reagents
4.2.1 Sulfuric acid (1+2).
4.2.2 Potassium permanganate standard titration solution [c(1/5KMnO.）==0.01mo1/L]. 4.2.3 Oxalic acid standard titration solution Lc(1/2HzC2O,·2H2O)=0.01mo1/L]. 4.3 Analysis steps
4.3.1 Treatment of conical flask: Take 100mL of water, put it into a 250mL conical flask, add 5mL of sulfuric acid (1+2), 5mL of potassium permanganate solution, boil for 5min, pour it out, rinse with water for later use. 4.3.2 Titration: Accurately pipette 100mL of water soaking solution (filter if there is residue) into the above-treated 250mL conical flask, add 5mL of sulfuric acid (1+2) and 10.0mL of potassium permanganate standard titration solution (0.01mol/L), and then add 2 glass beads, boil accurately for 5min, add 10.0mL of oxalic acid standard titration solution (0.01mol/L) while hot, and then titrate with potassium permanganate standard titration solution (0.01mol/L) until it turns slightly red, and record the secondary potassium permanganate solution titration amount. Take another 100mL of water and perform the reagent blank test in the same way as above. 4.4 Calculation of results See formula (1): X = (Vr-V) Xc × 31.6 × 1000 GB/T5009.60-2003 Where: X - the amount of potassium permanganate consumed in the sample, in milligrams per liter (mg/L); V - the volume of potassium permanganate solution consumed during titration of the sample immersion solution, in milliliters (mL); Vz - the volume of potassium permanganate solution consumed during titration of the reagent blank, in milliliters (mL): the actual concentration of the potassium permanganate standard titration solution, in moles per liter (mol/L): 31.6 - the mass of potassium permanganate equivalent to 1.0 mL of the potassium permanganate standard titration solution [c (1/5KMnO,) = 0.001 mol/L], in milligrams (mg). The calculation result should retain three significant figures.
4.5 Precision
The absolute difference between two independent determination results obtained under repeatability conditions shall not exceed 10% of the arithmetic mean. 5 Evaporation residue
5.1 Principle
After the sample is soaked in various solutions, the evaporation residue represents the amount of dissolution in different soaking solutions. The four solutions simulate the conditions of contact with water, acid, wine, and oil with different properties of food. 5.2 Analysis steps
Take 200mL of each soaking solution and place it in a 50mL glass evaporating blood or a constant-volume vial concentrator (for recovering n-hexane) that has been dried to a constant volume at 100℃±5℃ in advance, evaporate it on a water bath, dry it at 100℃±5℃ for 2h, cool it in a desiccator for 0.5h, weigh it, and then dry it at 100℃±5℃ for 1h, take it out, cool it in a desiccator for 0.5h, and weigh it. Perform a blank test at the same time.
5.3 Calculation of results
See formula (2):
Wherein:
X(m=ma)×1000
The evaporation residue of the sample solution (different immersion solutions), in milligrams per liter (mg/L); The mass of the evaporation residue of the sample solution, in milligrams (mg); m
The mass of the blank immersion solution, in milligrams (mg). The calculation result shall retain three significant figures.
5.4 Precision
The absolute difference between two independent determination results obtained under repeatability conditions shall not exceed 10% of the arithmetic mean. 6 Heavy metals
6.1 Principlewww.bzxz.net
The heavy metals (in terms of lead) in the immersion solution react with sodium sulfide to form yellow-brown lead sulfide in an acidic solution. Compared with the standard, it shall not be darker, which means that the heavy metal content meets the standard.
6.2 Reagents
6.2.1 Sodium sulfide solution: Weigh 5g sodium sulfide and dissolve it in a mixture of 10mL water and 30ml glycerol, or mix 30mL water and 90ml glycerol and divide it into two equal parts. Add 5g sodium hydroxide to one part and dissolve it. Then pass hydrogen sulfide gas (iron sulfide plus dilute hydrochloric acid) to saturate the solution. Then pour the other part of the water and glycerol mixture into it, mix it evenly, put it into a bottle, and store it in a sealed container. 6.2.2 Lead standard solution: Accurately weigh 0.1598g lead nitrate, dissolve it in 10mL nitric acid (10%), transfer it into a 1000mL volumetric flask, and dilute it to the mark with water. Each milliliter of this solution is equivalent to 100μg lead. 6.2.3 Lead standard working solution: Take 10.0mL of lead standard solution, place it in a 100mL volumetric flask, and dilute it to the mark with water. Each 476
milliliters of this solution is equivalent to 10ug lead.
6.3 Analysis steps
GB/T5009.60—2003
Pull 20.0mL of acetic acid (4%) soaking solution into a 50mL colorimetric tube and add water to the scale. Take another 2mL of lead standard working solution into a 50mL colorimetric tube, add 20mL of acetic acid (4%) solution, add water to the scale and mix well, add 2 drops of sodium sulfide solution to each of the two solutions, mix well, and place for 5 minutes. With a white background, observe from the top or side. The color of the sample cannot be darker than the standard solution. Expression of results: The color is greater than the standard tube sample, and the reported value of heavy metals [in terms of lead (Pb)] is >1.7 Decolorization test
Take a clean tableware to be tested, use cotton stained with cold cooking oil and ethanol (65%), and wipe it back and forth 100 times in a small area of ​​the food contact part. The cotton should not be stained with color. The four soaking solutions should also not be stained with color.
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