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GB 31604.48-2016 PDF English

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GB 31604.48-2016: National standard for food safety - Food contact materials and products - Determination of formaldehyde migration
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GB 31604.48-201670 Add to Cart Auto, 9 seconds. National standard for food safety - Food contact materials and products - Determination of formaldehyde migration Valid

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GB 31604.48-2016: National standard for food safety - Food contact materials and products - Determination of formaldehyde migration


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GB NATIONAL STANDARD OF THE PEOPLE’S REPUBLIC OF CHINA National standard for food safety – Food contact materials and products - Determination of formaldehyde migration Issued on. OCTOBER 19, 2016 Implemented on. APRIL 19, 2017 Issued by. National Health and Family Planning Commission of the People’s Republic of China

Table of Contents

Foreword... 3 1 Scope... 4 Method I Acetylacetone spectrophotometric method... 4 2 Principle... 4 3 Reagents and materials... 4 4 Instruments and equipment... 5 5 Analysis steps... 5 6 Expression of analysis results... 6 7 Precision... 7 8 Others... 7 Method II Chromotropic acid spectrophotometric method... 7 9 Principle... 7 10 Reagents and materials... 7 11 Analysis steps... 9 12 Expression of analysis results... 10 13 Precision... 10 14 Others... 10 Annex A Calibration of formaldehyde standard stock solution... 12

Foreword

This Standard replaces GB/T 5009.178-2003 “Determination of formaldehyde for food packaging material”, Clause 8 “Formaldehyde” in GB/T 5009.61-2003 “Method for analysis of hygienic standard of products of tripolycyanamide for food packaging”, Clause 7.2 “Free formaldehyde” in GB/T 5009.69-2008 “Method for analysis of hygienic standard of epoxy phenolic coatings for inner wall of food cans” and determination of formaldehyde in water-based simulants in GB/T 23296.26-2009 “Food contact materials - Polymer - Determination of formaldehyde and hexamethylenetetramine in food simulants - Spectrophotometry”. Compared with GB/T 5009.178-2003, the main changes of this Standard are as follows. - MODIFY the standard name TO “National standard for food safety - Food contact materials and products - Determination of formaldehyde migration”; - DELETE the oscillopolarographic method; ADD acetylacetone spectrophotometric method and chromotropic acid spectrophotometric method. National standard for food safety – Food contact materials and products – Determination of formaldehyde migration

1 Scope

This Standard specifies the spectrophotometric method for the determination of formaldehyde migration in food contact materials and products. This Standard applies to the determination of formaldehyde migration in food contact materials and products. Method I Acetylacetone spectrophotometric method

2 Principle

After the food simulant is in contact with the sample, the formaldehyde in the sample migrates to the food simulant. In the presence of ammonium acetate, gormaldehyde reacts with acetylacetone and generate yellow 3,5-diacetyl-1,4  dihydrodimethylpyridine; USE a spectrophotometer to measure the absorbance of the test solution at 410 nm; COMPARE it with that of the reference series to obtain the content of formaldehyde in the food simulant, and then obtain the formaldehyde migration in the sample.

3 Reagents and materials

Unless otherwise stated, the reagents used in this method are of analytical reagent and water is the tertiary water specified in GB/T 6682. 3.1 Reagents 3.2 Preparation of reagents 3.2.1 Water-based food simulants. PREPARE according to the specifications of GB 5009.156. 3.2.2 Acetylacetone solution. WEIGH 15.0 g of anhydrous ammonium acetate and dissolve in the appropriate amount of water; TRANSFER into a 100 mL volumetric flask; ADD 40 μL of acetylacetone and 0.5 mL of glacial acetic acid; DILUTE with water to the scale; MIX well. This solution is prepared when it is in need. 3.3 Preparation of standard solutions 3.3.1 Formaldehyde solution (37 % ~ 40 %, mass fraction). preserve at 0 °C ~ 4 °C.

4 Instruments and equipment

4.1 UV-visible spectrophotometer. 4.2 Constant-temperature water bath. the precision is controlled at ± 1 °C.

5 Analysis steps

5.1 Migration test According to the intended use and the use conditions of the sample to be tested, in accordance with the requirements of GB 5009.156 and GB 31604.1, carry out the migration test to the sample. During the migration test to prior to the determination, it shall pay attention to sealing, in order to avoid the loss of formaldehyde volatile. At the same time carry out the blank test. 5.3 Plotting of standard curve TAKE 7 10 mL colorimetric tubes; according to the type of simulants used in the migration test, add corresponding formaldehyde standard use solution according to Table 1; 5.4 Determination of sample solution and blank solution PLACE the sample solution and the blank solution after chromogenic reaction into a 10 mm colorimetric cuvette; TAKE the blank solution after chromogenic reaction as the reference;

6 Expression of analysis results

6.1 Calculation of formaldehyde concentration in food simulants The concentration of formaldehyde in food simulants is calculated according to equation (1)

7 Precision

The absolute difference between the two independent determination results obtained under repeatability shall not exceed 10 % of the arithmetic mean.

8 Others

TAKE the concentration value corresponding to the absorbance of 0.01 higher than the absorbance value of the blank solution AS the detection limit;

9 Principle

After the food simulant is in contact with the sample, the formaldehyde in the sample migrates to the food simulant. In the presence of sulfuric acid, gormaldehyde reacts with chromotropic acid and generate purple compounds; USE a spectrophotometer to measure the absorbance of the test solution at 574 nm;

10 Reagents and materials

Unless otherwise stated, the reagents used in this method are of analytical reagent and water is a tertiary water or deionized water specified in GB/T 6682.All reagents in which formaldehyde shall not be detected by this method. 10.1 Reagents 10.2 Preparation of reagents 10.2.1 Water-based food simulants. PREPARE according to the specifications of GB 5009.156. 10.2.2 Sulfuric acid solution. MEASURE 100 mL of sulfuric acid, DISSOLVE in 50 mL of water, STIR slowly, MIX well. 10.3 Preparation of standard solutions 10.3.1 Formaldehyde solution (37 % ~ 40 %, mass fraction). preserve at 0 °C ~ 4 °C. 10.3.2 Formaldehyde standard stock solution. PIPETTE 5.0 mL of formaldehyde solution to a 1000 mL volumetric flask; DILUTE with water to the scale; PRESERVE at 0 °C ~ 4 °C; it is valid for 12 months; CALIBRATE before use (see Annex A); or use formaldehyde solution standard products to prepare directly.

11 Analysis steps

11.1 Migration test According to the intended use and the use conditions of the sample to be tested, in accordance with the requirements of GB 5009.156 and GB 31604.1, carry out the migration test to the sample. During the migration test to prior to the determination, it shall pay attention to sealing, in order to avoid the loss of formaldehyde volatile. 11.2 Blank test In addition to not contact with the sample to be tested, carry out the blank test according to 11.1. immediately in an ice-water bath for 2 min; TAKE out and return to room temperature. 11.4 Working curve TAKE 6 10 mL colorimetric tubes; according to the type of simulants used in the migration test, add corresponding formaldehyde standard use solution according to Table 2; ADD corresponding simulant to 1.0 mL; ADD 1.0 mL of colorimetric acid solution respectively; ADD slowly 8.0 mL of sulfuric acid solution; carefully shake colorimetric tubes. After the solution is sufficiently shaken, place the colorimetric tubes in a 90 °C water bath for 20 min; COOL immediately in an ice-water bath for 2 min; TAKE out and return to room temperature.

12 Expression of analysis results

12.1 Calculation of formaldehyde concentration in food simulants The concentration of formaldehyde in food simulants is calculated according to equation (2)

13 Precision

The absolute difference between the two independent determination results obtained under repeatability shall not exceed 10 % of the arithmetic mean. ......
Source: Above contents are excerpted from the full-copy PDF -- translated/reviewed by: www.ChineseStandard.net / Wayne Zheng et al.
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