This standard specifies the oscillographic polarographic method for the determination of free formaldehyde in food packaging materials. This standard is applicable to the determination of free formaldehyde in melamine resin molded products for food packaging, water-based modified epoxy can inner wall coatings, can inner wall release coatings, epoxy phenolic coatings and lacquer phenol coatings for food containers. GB/T 5009.178-2003 Determination of formaldehyde in food packaging materials GB/T5009.178-2003 Standard download decompression password: www.bzxz.net

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National Standard of the People's Republic of China
GB/15009.178—2003
Determination of formaldehyde For food packaging material2003-08-1Promulgated
Ministry of Health of the People's Republic of China
National Standards Administration of Standardization of the People's Republic of China
2004-01-01Implementation
This standard is jointly issued by the Ministry of Health of the People's Republic of China and the Ministry of Health of the People's Republic of China. GA/T 5009, 178—2003
The technical standard was drafted by the Health and Epidemic Prevention Station of Dianshan City, Hebei Province, and the Health and Epidemic Prevention Station of Tianfeng City participated in the drafting of this standard. The main drafters of this standard are: Zhang Wende, Gong Shaojie, Li Xinrong, Liu Sanfang, 453
GB/ 5009,178—2003
The current standard for the determination and removal of formaldehyde in food packaging materials is based on the GB/T5009.612003 food colorimetric method for the determination of free formaldehyde in chloroform-containing products and the GB/T5009.65-2004 food wax coating hygienic standard for the analysis of formaldehyde in the interior of the food. This standard is formulated as an indicative method for the determination of formaldehyde in food packaging materials. It is simple to operate, fast, sensitive, accurate, and has good integrity. The sample can be directly determined. 5
1 Specification
Determination of free formaldehyde in food packaging materials
This standard specifies the oscillographic determination of free formaldehyde in food packaging materials: GA,T 5009,179—2003
This standard is applicable to the determination of the corrosion resistance of food-grade fatty molded products, modified scurvy heat-resistant inner wall materials, mold release materials and coatings for containers. 2 Normative documents
The following documents have become technical standards through reference in this standard. All dated references are not applicable to the standard due to subsequent amendments (excluding the contents of animal protection) or revisions. The parties to the cooperation reached in accordance with this standard can use the latest version of this document. All undated referenced documents, the latest version of which shall apply to this standard, B5Jo3. Standard method for analysis of canned food containing additives 5.1 General test method for food repackaging materials and their preparations 3 Principle
In the acetone-containing chain at pH 5.5, the aldehydes react with the chain acids to form protonated aldehydes, which produce an adsorption charge at -4V. The peak height of the charge has a good linear relationship with the concentration of formaldehyde, and the peak height of the test group is relatively high compared with the peak height of the standard formaldehyde
4 Test results are average, and the water is water or carbonated beverage. 4.1 Ion determination: 28% ... Finally, the first step is to release the formaldehyde standard solution: 10.0ml of formaldehyde standard solution in a 1Uum1 container, and use the label to release the scale. This step is to increase the level of 10.04g of formaldehyde (use the system for research). 5 Collector
5.3MP-2 type short-term analysis of the money performance of the short-term potential stage 5.2 Three-electrode system: full technical requirements for the above work: the system needs to be flexible before the collection of net ratio of the electric device. Sales batch assistance, 5.31GmL customer bottle:
5.4 Micro-injection instrument,
6 Analysis steps
6.1 Preparation of standard alcohol
Special absorption 0, D.2, 0.4.5).6.C.8 1.5 mL of acetic acid-sodium acetic acid solution (4.55% acetic acid distilled water, GRT5099.178-2003) was added into 1 mL of 1 mL of standard working solution (equivalent to 1.25 V, 4.4 V, 6.1 V, 8.2 V, 12.5 V) respectively, and 2 mL of acetic acid-sodium acetic acid solution (4.55% acetic acid distilled water, GRT5099.178-2003) was added. After 2 minutes, the test battery was placed in a new cup and scanned from 100 °C to 200 °C. The potential was read at the second differential at 14 V. The peak was used as the vertical coordinate to construct a curve according to the requirements of GJ/T500J.156.
6.3 Sample determination
4 Use a microinjector to draw 0.01 rl~0.03 uL of the water-soaked solution into a 1:1 nuI container. Add 6.1 to 2L of pH 5.6 acid-acetic acid in a flow rate analyzer and proceed as follows: The highest value on the calibration curve corresponds to the formaldehyde content. 6.4 Calculation of results
m×10GC
Wu:
X The amount of foam in the test sample is measured in grams per liter (g/l). The volume of the sample collected at the specified time is taken as the unit of measurement (tnI). 7 Precision
The results of two independent determinations obtained under the specified conditions shall not be increased by more than 5:45 of the average value.
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