This standard specifies the analysis methods for various hygienic indicators in coatings with perchloroethylene resin as the main raw material, pigments and additives. This standard is applicable to the analysis of various hygienic indicators in coatings with perchloroethylene resin as the main raw material, pigments and additives. GB/T 5009.68-2003 Analysis methods for hygienic standards of perchloroethylene coatings on the inner wall of food containers GB/T5009.68-2003 Standard download decompression password: www.bzxz.net

ICS67.040
National Standard of the People's Republic of China
GB/T5009.68--2003
Replaces GB/T5009.68-1996
Method for analysis of hygienic standard ofperchorovinyl-coating for inner wall offood container
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, 2004bzxz.net
GB/T5009.68-2003
This standard replaces GB/T5009.68-1996 "Method for analysis of hygienic standard ofperchorovinyl-coating for inner wall offood container". Compared with GB/T5009.68--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 Shanghai Municipal Health and Epidemic Prevention Station and Shanghai Paint Factory. This standard was first issued in 1985 and revised for the first time in 1996. This is the second revision. 514
1 Scope
Analysis method of hygienic standard of perchlorethylene coating on the inner wall of food containers
GB/T5009.68-2003
This standard specifies the analysis method of various hygienic indicators in coatings composed of perchlorethylene resin as the main raw material, pigments and additives.
This standard is applicable to the analysis of various hygienic indicators in coatings composed of perchlorethylene resin as the main raw material, pigments and additives. 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/T5009.11—2003 Determination of total and inorganic arsenic in food GB/T5009.60—2003 Analysis method for hygienic standards of polyethylene, polystyrene and polypropylene molded products for food packaging GB/T.5009.67—2003 Analysis method for hygienic standards of polyvinyl chloride molded products for food packaging GB7105 Hygienic standards for perfluoroethylene inner wall coatings for food containers 3 Sensory inspection (including containers and samples, etc.) 3.1 The coating film is smooth and has no pores.
3.2 The coating film does not soften, crack or bubble after immersion. 3.3 The soaking liquid is a colorless, odorless, transparent liquid. It should comply with the provisions of GB7105.
4 Sample preparation method
Use a (5.0X×5.0) cm steel plate (thickness 0.5mm~1mm) or flat glass (thickness about 2mm) as the substrate, and coat it into a double-sided sample according to the actual construction process. After natural drying for 10 days, it is used for soaking test (single-sided or double-sided coating, calculate its area). 5 Soaking conditions
5.1 Sample 1cm is calculated as 2ml soaking liquid.
5.2 Steaming filling water: 60℃2h.
5.3 Acetic acid (4%): 60℃, 2h.
5.4 Ethanol 65%): 60℃, 2h.
6 Evaporation residue
Operate according to Chapter 5 of GB/T5009.60-2003. 7 Potassium permanganate consumption
According to Chapter 4 of GB/T5009.60-2003. 515
GB/T5009.68—2003
8 Heavy metals
According to Chapter 6 of GB/T5009.60-2003. 9 Monument
9.1 Principle, reagents, instruments
Same as Chapter 9, Chapter 10, Chapter 11 of GB/T5009.112003. 9.2 Analysis steps
Pipette 10.0mL~20.0mL acetic acid (4%) soaking solution into a 150mL conical flask, and accurately pipette 0.2, 4.060, 8.0.10.0mL of arsenic standard solution (equivalent to 0, 2.0, 4.0, 6.0, 8.0, 10.0ug) into conical flasks respectively, add water to 43mL in the sample tube and arsenic standard tube respectively, add 7mL hydrochloric acid, 2mL L potassium iodide, 0.5mL stannous chloride solution, mix well and let stand for 15 minutes, add 5g zinc particles, immediately plug the glass curved tubes filled with lead acetate cotton, and insert the tip of the curved tube into a centrifuge tube (or graduated test tube) containing 5mL silver salt solution. After reacting for 1 hour, remove the test tube, add chloroform to make up to 5mL, and then transfer it to a 1cm colorimetric cup, adjust the zero point with a zero tube, measure the absorbance at a wavelength of 540nm, and draw a standard curve for comparison. 9.3 Result calculation
m×1000
VX1000
Where:
X-——the content of arsenic in the sample, in milligrams per liter (mg/L): m-the mass of arsenic in the sample soaking solution for determination, in micrograms (ug); V-—the volume of the sample soaking solution for determination, in milliliters (mL). The calculation result retains two significant figures.
9.4 Precision
Same as Chapter 15 of GB/T5009.11-2003. 10 Vinyl chloride monomer
According to Chapter 6 of GB/T5009.67--2003. 516
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