This standard specifies the analysis methods for various hygienic indicators of various tableware, containers and other food utensils made of melamine as raw material. This standard is applicable to the analysis of various hygienic indicators of various tableware, containers and other food utensils made of melamine as raw material. GB/T 5009.61-2003 Analysis methods for hygienic standards of melamine molded products for food packaging GB/T5009.61-2003 Standard download decompression password: www.bzxz.net

ICS 67.040
National Standard of the People's Republic of China
GB/T5009.61---2003
Replaces GB/T5009.61--1996
Method for analysis of hygienic standard of products of tripolycyanamide for food packagingIssued 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/T5009.61—2003
This standard replaces GB/T5009.61--1996 "Method for analysis of hygienic standard of products of tripolycyanamide for food packaging". Compared with GB/T5009.61-1996, this standard has been modified 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. 480
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Analysis methods for hygienic standards of melamine molded products for food packaging
GB/T5009.61-2003
This standard specifies the analysis methods for various hygienic indicators of various tableware, containers and other various food utensils made of melamine as raw material
This standard is applicable to the analysis of various hygienic indicators of various tableware, containers and other various food utensils made of melamine as raw material.
2 Normative references
The clauses in the following documents become the clauses of this standard through reference in this standard. For all dated references, all subsequent amendments (excluding errata) or revisions are not applicable to this standard. However, parties to an agreement based on this standard are encouraged to study whether the latest versions of these documents can be used. For all undated references, the latest versions are applicable to this standard. GB/T5009.60—2003 Hygienic standard for sangvinyl, polystyrene and polypropylene molded products for food packaging 3 Sampling method
According to Chapter 2 of GB/T5009.60-2003. 4 Bubble conditions
According to Chapter 3 of GB/T5009.60--2003. 5 Potassium permanganate consumption
According to Chapter 4 of GB/T5009.60—2003. 6 Evaporation residue
Operate according to Chapter 5 of GB/T5009.60-2003. 7 Heavy metals
Operate according to Chapter 6 of GB/T5009.60-2003. 8 Formaldehyde
8.1 Principle
Formaldehyde and phenylhydrazine hydrochloride are oxidized in acidic conditions to form a red compound, which is quantitatively compared with the standard series, and the minimum detection limit is 5 mg/L.
8.2 Reagents
8.2.1 Phenylhydrazine hydrochloride solution (10g/L): Weigh 1.0g phenylhydrazine hydrochloride, add 80mL water to dissolve, then add 2ml. Hydrochloric acid (10+2), dilute to 100mL with water, filter, and store in a brown bottle. 8.2.2 Potassium ferrocyanide solution (20g/L). 8.2.3 Hydrochloric acid (10+2): Take 100 mL of hydrochloric acid and dilute to 120 mL with water. 481
GB/T 5009.61—2003
8.2.4 Formaldehyde standard solution: Take 2.5 mL of 36%-38% formaldehyde solution and place it in a 250 mL volumetric flask, dilute to the mark with water, calibrate with iodine titration, and finally dilute to 100 μg formaldehyde per mL. 8.2.5 Formaldehyde standard working solution: Take 10.0 mL of formaldehyde standard solution and place it in a 100 mL volumetric flask, dilute to the mark with water. This solution is equivalent to 10.0 μg formaldehyde per mL.
8.3 Analysis steps
Take 10.0 mL of acetic acid (4%) soaking solution in a 100 mL volumetric flask, add water to the mark, and mix well. Pipette 2mL of this dilution into a 25mL colorimetric tube. Pipette 0, 0.2, 0.4, 0.6, 0.8, 1.0mL of formaldehyde standard solution (equivalent to 0, 2, 4, 6, 8, 10μg formaldehyde) into 25mL colorimetric tubes, and add water to 2mL. Add 1mL of hydrochloric acid benzene solution to each sample and standard tube, shake and place for 20min. Add 0.5mL of potassium ferrocyanide solution to each, place for 4min, add 2.5mL of hydrochloric acid (10+2) to each, add water to 10mL, and mix well. Use a 1cm colorimetric cup and a zero tube to adjust the zero point within 10min to 40min, measure the absorbance at a wavelength of 520nm, and draw a standard curve for comparison. 8.4 Calculation of results
Where:
mx1000
10×1×1000
X is the formaldehyde content in the immersion solution, in milligrams per liter (mg/L); m
is the mass of formaldehyde in the dilution solution taken during the determination, in micrograms (μg); V is the volume of the diluted immersion solution taken during the determination, in milliliters (mL). The calculation result shall retain three significant figures.
8.5 Precision
The absolute difference between two independent determination results obtained under repeatability conditions shall not exceed 10% of the arithmetic mean. 9 Decolorization test
Perform according to Chapter 7 of GB/T5009.60--2003. 482
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