This standard specifies the analytical method for residual 1,1-dichloroethane in polyvinyl chloride resins and finished products for food containers and packaging materials. This standard is applicable to the determination of residual 1,1-dichloroethane in polyvinyl chloride resin molded products for food containers and packaging materials produced by the acetylene method, or the determination of residual 1,2-dichloroethane in polyvinyl chloride resins and molded products for food containers and packaging materials produced by the ethylene method. This standard is also applicable to the determination of residual vinyl chloride, vinylidene chloride, and 1,1-dichloroethane in vinyl chloride and vinylidene chloride copolymer resins and molded products. GB/T 5009.122-2003 Determination of residual 1,1-dichloroethane in polyvinyl chloride resins and molded products for food containers and packaging materials GB/T5009.122-2003 Standard download decompression password: www.bzxz.net

104 67, 040
National Standard of the People's Republic of China
GB/T5009.122—2003
Replaces GB/T14943—1994
Determinatiun of residual ethylidene dichloride irpolyvinyl chloride resin and produce1 fonfoud container and packaging material2003-08-11 Issued by
Ministry of Health of the People's Republic of China
National Standardization Administration of China
2004-01-01 Implementation
0B/T5009.122-2003
This standard replaces GR/T14943-19944 - Method for analysis of residual 1.1-dioxane in polyvinyl chloride resin and its products for food containers and packaging materials.
Compared with GR/114943-1994, the main features of this standard are as follows: ··The Chinese name of the standard is "Determination of 1.1-dioxane in polyfluoroethylene resin and its products for food containers and packaging materials"
According to GB/T20301.4-2001 standard practice rules Part 4: Chemical analysis method3, the original standard has been revised.
This standard was issued and published by the Ministry of Health of the People's Republic of China. The drafting units of this standard are: Municipal Health and Prevention Center, Provincial Health and Medical Center, and Municipal Tree Factory. The main contributors are Niu Song, Ma Xiejun, Jing Tang, Yu Youde, Liu Xiying, and Shuo Yanshu. The original standard was issued for the first time in 1394, and this standard is revised for the second time. 165bzxZ.net
1 Scope
Determination of residual 1,1-dichloroethane in vinyl chloride resins and molded products for food containers and packaging materials GB/T 5009.122-2003
This standard specifies the analytical method for 1,1-dichloroethane in vinyl chloride products and molded products for food containers and packaging materials. This standard is applicable to the determination of residual 1,1-dichloroethane in polyvinyl chloride resin products for food containers and packaging materials produced by the acetylene method, or the determination of residual 1,3-dichloroethane in polyvinyl chloride resins and products for food containers and packaging materials produced by the ethylenic method. This standard is also applicable to the determination of vinyl chloride, vinylidene chloride and 1,1-dichloroethane in vinyl chloride and vinylidene chloride copolymer resins and their molded products.
2 Normative references
The references in the following documents constitute the clauses of this standard by reference. For all references with a date, all subsequent amendments (excluding errors) or revisions are applicable to this standard. However, the latest versions of these documents may be used by the research teams that have reached an agreement with this standard. For references without a date, the latest versions are applicable to this standard. GD/T5509.58 Analytical method for hygienic standard of polyethylene for food packaging Analytical method for hygienic standard of polyethylene for food packaging GB/T 6009.671
3 Source analysis
Based on gas-solid equilibrium, in a sealed container at a certain temperature, the residual 1,1-monoethylene in the sample rapidly diffuses into the air. When the equilibrium is reached, a certain amount of air is injected into the chromatograph for analysis, and the peak height is determined by the retention time. 4 Reagents
1,1-ethane, chromatograph and.
5 Receiver
5.t Gas phase instrument with high-frequency sub-cell. 5.2 Small constant plate drying oven: 80℃=1℃.5.3 Medical syringe: 1mL, 2ml., 5mL.10L, 5.4 Volumetric syringe: 10μT.
5.5 Sealed plate, 25mL, with rubber pads and brazing phase. 5.6 Gas cylinder: 500ml, its matching silicone rubber sheet and steel pipe, 6 color recording parts
.1 Chromatographic sample: stainless steel holder, L2mX4mIt, 6.2 Stationary phase, 0.2% chromatographic body, 60-8℃, 2.5% DNP and 2.5% organic soap, 6.3 Determination conditions, temperature, 77: vaporization plate: 130℃: temperature measurement bottom: 130, gas: 25L/min, oxygen, 30m/en air..oml./min.
GA/T 5009.122—2003
7 Analysis steps
7.1 Sampling method
The resin was analyzed according to the sampling method specified in GB/T 5009.=8. The sampling method specified in GB/T 5009.67 is used for the sample preparation.
7.2 Standard curve
Extract 1,1-10 ml of ethane standard gas and inject it into the evacuated gas cylinder. Open and close the valve of the gas cylinder to balance the internal and external pressures. Disassemble the gas cylinder and let it stand for 10 minutes before use. Collect 5 mL of the above standard gas and inject it into a 100 ml injection tube filled with 95 ml of clean air. Take 1 ml, 2 ml, 4 ml, 5 ml of the standard gas after release and inject them into five balance bottles filled with 1.000 s blank respectively. The balance bottles are balanced in a drying oven for 3 seconds and 1 ml of pre-air is taken for sampling. Draw a standard curve with the component list as the coordinate and the component list as the ordinate (the standard curve with different content ranges can be prepared according to the two requirements). The standard gas concentration is calculated as shown in the formula ()
V, Xd ×1 000
Wherein:
Standard gas concentration, unit is microgram per liter (ug/mI) Component weight of the gas cylinder, unit is microliter (L): -Gas carrier volume, unit is liter (mL), f-
Component specific gravity ([1-Dichloroethane mass 1.1761+ dilution factor:
7.3 Sample determination
Weigh 1.000g of the sample and wipe it clean and put it into a balance bottle. After sealing the stopper, balance it in 800min. Draw 1m of headspace air for sampling, determine the peak value of the component, and check it on the standard curve to obtain: 7. 4 Calculation of results
Calculation of results Formula (2):
In the method:
- content of the test component, in grams per kilogram (/k) + peak value of the standard component, in millimeters (nim); sample mass, in millimeters (mm); standard component mass, in micrograms (\g); test mass in millimeters (2).
5 Precision
The absolute value of the results of two determinations under regeneration conditions shall not exceed 10% of the technical average. 1.5
. (2)
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