GB 31604.21-2025 English PDFUS$219.00 · In stock
Delivery: <= 3 days. True-PDF full-copy in English will be manually translated and delivered via email. GB 31604.21-2025: National food safety standard - Food contact materials and products - Determination of migration of benzoic acid, phthalic acid and trimellitic acid in food Status: Valid GB 31604.21: Historical versions
Basic dataStandard ID: GB 31604.21-2025 (GB31604.21-2025)Description (Translated English): National food safety standard - Food contact materials and products - Determination of migration of benzoic acid, phthalic acid and trimellitic acid in food Sector / Industry: National Standard Classification of Chinese Standard: C53 Word Count Estimation: 11,116 Date of Issue: 2025-09-02 Issuing agency(ies): National Health Commission; State Administration for Market Regulation GB 31604.21-2025: National food safety standard - Food contact materials and products - Determination of migration of benzoic acid, phthalic acid and trimellitic acid in food---This is an excerpt. Full copy of true-PDF in English version (including equations, symbols, images, flow-chart, tables, and figures etc.), auto-downloaded/delivered in 9 seconds, can be purchased online: https://www.ChineseStandard.net/PDF.aspx/GB31604.21-2025 National Standards of the People's Republic of China National Food Safety Standards Food contact materials and articles Determination of migration of benzoic acid, phthalic acid and tribenzoic acid Published on 2025-09-02 Implemented on 2026-03-02 National Health Commission of the People's Republic of China State Administration for Market Regulation issued ForewordThis standard replaces GB 31604.21-2016 "National Food Safety Standard for Terephthalic Acid Migration in Food Contact Materials and Articles". "Determination". Compared with GB 31604.21-2016, the main changes in this standard are as follows. ---The standard name has been changed to "National Food Safety Standard for Food Contact Materials and Products Containing Benzoic Acid, Phthalic Acid and Tribenzoic Acid". "Determination of Transfer Volume"; ---The scope has been modified to include benzoic acid, 1,2-phthalic acid, 1,3-phthalic acid, 1,3,5-benzenetricarboxylic acid, and 1,2,4-benzenetricarboxylic acid. Determination of the migration of 1,2,3-benzenetriacic acid; ---The analysis steps and result descriptions have been modified. National Food Safety Standards Food contact materials and articles Determination of migration of benzoic acid, phthalic acid and tribenzoic acid 1.Scope This standard specifies the use of benzoic acid, 1,2-phthalic acid (also known as orthophthalic acid), and 1,3-phthalic acid (also known as...) in food contact materials and articles. (Isophthalic acid), 1,4-phthalic acid (also known as terephthalic acid), 1,3,5-triphenylcarboxylic acid (also known as pyromellitic acid), 1,2,4-triphenylcarboxylic acid Liquid chromatography method for determining the migration of trimellitic acid (also known as benzotricarboxylic acid) and 1,2,3-benzenetricarboxylic acid (also known as triphenyltricarboxylic acid). This standard applies to plastic materials and products for food contact, paper and paperboard materials and products for food contact, and food contact materials and products. Benzoic acid, phthalic acid, isophthalic acid, terephthalic acid, triphenyl phthalate, and trimellitic acid are used in adhesives, food contact coatings, and coatings. Determination of the migration of formic acid and triphenylcarboxylic acid. 2.Principle After migration tests were conducted on food contact materials and articles according to GB 31604.1 and GB 5009.156, the levels of olive oil and isooctane in the immersion solution were... Each target analyte was extracted with 50% (v/v) ethanol or acetonitrile solution (5.1); the 95% (v/v) ethanol soaking solution was used to extract the ethanol. Dilute to below 50% by volume; other soaking solutions are directly injected for analysis. Each target analyte is separated by liquid chromatography and analyzed using a UV detector or... Measurements were taken using a diode array detector, and quantification was performed using the external standard method. 3.Reagents and Materials Unless otherwise stated, all reagents used in this method are of analytical grade, and the water is Grade I water as specified in GB/T 6682. 3.1 Reagents 3.1.1 Glacial acetic acid (C2H4O2). 3.1.2 Anhydrous ethanol (C2H6O). 3.1.3 Acetonitrile (C2H3N). 3.1.4 95% ethanol. 3.1.5 Sodium hydroxide (NaOH). 3.1.6 n-Heptane (C7H16). 3.1.7 Isooctane (C8H18). 3.1.8 Phosphoric acid (H3PO4). chromatographic grade. 3.1.9 Acetonitrile (C2H3N). chromatographic grade. 3.2 Reagent Preparation 3.2.1 Food simulants. Prepared in accordance with the requirements of GB 5009.156. 3.2.2 0.05% (volume fraction) phosphoric acid solution. Take 0.5 mL of phosphoric acid, add 1000 mL of water, and mix well. 3.2.3 Acetonitrile solution (5 1). Measure 50 mL of acetonitrile (analytical grade) and 10 mL of water, and mix well. 3.2.4 Acetonitrile solution (1+1). Measure 50 mL of acetonitrile (analytical grade) and 50 mL of water, and mix well. 3.2.5 50% (volume fraction) ethanol solution. Measure 50 mL of anhydrous ethanol and 50 mL of water, and mix well. 3.2.6 1.0 mol/L NaOH solution. Prepared according to GB/T 601, no standardization required. 3.3 Standards/Substances Seven standards for benzoic acid, phthalic acid, and tribenzoic acid (see Appendix A), with a purity ≥99%, or certified by the state and granted the title of standard substance. The standard material for the certificate. 3.4 Preparation of Standard Solutions 3.4.1 Standard Stock Solution 3.4.1.1 Terephthalic acid standard stock solution (500 mg/L) Accurately weigh 50 mg (accurate to 0.1 mg) of terephthalic acid into a stoppered conical flask, add 1 mL of 1.0 mol/L NaOH solution, After ultrasonic dissolution, a small amount of acetonitrile solution (1.1) was added for dilution, and the solution was transferred to a 100 mL volumetric flask and brought to volume with acetonitrile solution (1.1). Store in the dark at 4℃~10℃. Shelf life is 6 months. 3.4.1.2 Other standard reference materials single-standard stock solutions (1000 mg/L) Accurately weigh 100 mg (accurate to 0.1 mg) of other standard substances into a stoppered conical flask, add 1 mL of 1.0 mol/L NaOH solution. After ultrasonic dissolution, a small amount of acetonitrile solution (1.1) was added for dilution, and the solution was transferred to a 100 mL volumetric flask and diluted to volume with acetonitrile solution (1.1). Store in the dark at 4℃~10℃. Shelf life is 6 months. 3.4.2 Mixed Standard Intermediate Solution A Accurately transfer 24 mL of terephthalic acid stock solution (500 mg/L) and 1.0 mL of trimesic acid standard stock solution (1000 mg/L) into... In a.200 mL volumetric flask, transfer 12 mL of each of the other five standard stock solutions (1000 mg/L) into the same volumetric flask, and dilute with acetonitrile. Volume up and mix well. The mass concentration of pyromellitic acid in the mixed standard intermediate solution is 5 mg/L, and the mass concentrations of the other target analytes are... The concentration is 60 mg/L. The mixed standard intermediate solution should be stored at 4℃~10℃ protected from light, and has a shelf life of 15 days. 3.4.3 Mixed Standard Intermediate Solution B Accurately transfer 25 mL of mixed standard intermediate solution A into a 50 mL volumetric flask, dilute to the mark with acetonitrile, and mix well. The concentration of pyromellitic acid in solution B is 2.5 mg/L, and the concentration of all other target analytes is 30 mg/L. Prepare fresh before use. 3.4.4 Mixed Standard Intermediate Solution C Accurately transfer 5.0 mL of terephthalic acid stock solution (500 mg/L) into a 25 mL volumetric flask, and then accurately transfer 2.5 mL of other solutions into each flask. Six standard stock solutions (1000 mg/L) were placed in the same volumetric flask and diluted to the mark with acetonitrile, then mixed thoroughly. Mixed standard intermediate solution C The mass concentration of each target analyte is 100 mg/L. Prepare fresh before use. 3.4.5 Mixed Standard Working Solution Series 3.4.5.1 Mixed Standard Working Solution Series D (Suitable for quantitative analysis of various target analytes in olive oil and isooctane) Accurately transfer 0.125 mL, 0.40 mL, 1.0 mL, 2.0 mL, 3.0 mL, and 4.0 mL of mixed standard intermediate solution B into six separate containers. In a 10 mL volumetric flask, dilute to the mark with water and mix well. The mass concentrations of pyromellitic acid in the resulting standard series of working solutions are as follows. The concentrations of the remaining six target analytes were 0.031 mg/L, 0.10 mg/L, 0.25 mg/L, 0.50 mg/L, 0.75 mg/L, and 1.0 mg/L. The concentrations were 0.375 mg/L, 1.2 mg/L, 3.0 mg/L, 6.0 mg/L, 9.0 mg/L, and 12 mg/L, respectively. Prepare fresh before use. When the sample solution... When the mass concentrations of benzoic acid and phthalic acid exceed the above linear range, 1.0 mL, 2.0 mL, and 3.0 mL can be accurately transferred, respectively. 4.0 mL, 5.0 mL, and 6.0 mL of the mixed standard intermediate solution C were placed in six 10 mL volumetric flasks, and diluted to the mark with water. The resulting standard... The mass concentrations of the seven target analytes in the quasi-series working solutions were 10 mg/L, 20 mg/L, 30 mg/L, 40 mg/L, 50 mg/L, and... 60 mg/L. Prepare immediately before use. 3.4.5.2 Mixed Standard Working Solution Series E (Suitable for quantitative analysis of target analytes in other food simulants and chemical alternative solvents) Accurately transfer 0.10 mL, 0.125 mL, 0.40 mL, 1.0 mL, 2.0 mL, 3.0 mL, and 4.0 mL of mixed standard intermediate solution B into [the following locations]. Dilute to the mark with water in seven 10 mL volumetric flasks and mix well. The mass concentrations of pyromellitic acid in the resulting standard series of working solutions are as follows. 0.025 mg/L, 0.031 mg/L, 0.10 mg/L, 0.25 mg/L, 0.50 mg/L, 0.75 mg/L, 1.0 mg/L, and the remaining 6 target fractions The mass concentrations of the precipitates were 0.30 mg/L, 0.375 mg/L, 1.2 mg/L, 3.0 mg/L, 6.0 mg/L, 9.0 mg/L, and 12.0 mg/L, respectively. Use freshly prepared solutions. When the mass concentrations of benzoic acid and phthalic acid in the sample solution exceed the above linear range, accurately transfer 1.0 mL of each solution. Mix 2.0 mL, 3.0 mL, 4.0 mL, 5.0 mL, and 6.0 mL of standard intermediate solution C into six 10 mL volumetric flasks, and dilute to the mark with water. Mix well. The mass concentrations of the seven target analytes in the resulting standard series of working solutions were 10 mg/L, 20 mg/L, 30 mg/L, and... 40mg/L, 50mg/L, 60mg/L. Prepare immediately before use. 3.5 Materials Filter membrane. hydrophilic polytetrafluoroethylene with a pore size of 0.45 μm. 4.Instruments and Equipment 4.1 Liquid Chromatograph. Equipped with an ultraviolet detector or a diode array detector. 4.2 Water bath oscillator. 4.3 Vortex Oscillator. 4.4 Balance. Sensitivity is 0.01g and 0.1mg respectively. 4.5 Centrifuge. speed ≥ 3000 r/min. 4.6 Pipettes. with capacities of 100 μL, 1 mL and 5 mL. 4.7 Rotary evaporator or nitrogen blowing device. 5.Analysis Steps 5.1 Migration Test Food contact materials and articles shall undergo migration testing in accordance with the requirements of GB 31604.1 and GB 5009.156.The results of the migration test, including immersion... If the liquid cannot be tested immediately, it can be stored in the dark at 0℃~4℃ for no more than 3 days. If further testing is to be conducted, the liquid should be... Use the soaking solution after it has returned to room temperature. 5.2 Treatment of soaking solution 5.2.1 Treatment of olive oil infusion 5.2.1.1 Phthalic acid and tribenzoic acid test solutions. Accurately weigh 5.0 g (accurate to 0.01 g) of the olive oil infusion solution obtained from the migration test to... Add 5.00 mL of n-heptane and 4.00 mL of 50% (v/v) ethanol solution to a 25 mL stoppered glass centrifuge tube, and centrifuge at 1500 rpm. Vortex extraction for 15 min, centrifugation at 3000 r/min for 10 min, and the lower layer of ethanol solution is filtered through a filter membrane and ready for analysis. 5.2.1.2 Benzoic acid test solution. Accurately weigh 10.0 g (accurate to 0.01 g) of the olive oil immersion solution obtained from the migration test into a 25 mL stoppered glass. Add 4.00 mL of acetonitrile solution (5.1) to a glass centrifuge tube, vortex at 1500 rpm for 15 min, and centrifuge at 3000 rpm. ......Tips & Frequently Asked Questions:Question 1: How long will the true-PDF of GB 31604.21-2025_English be delivered?Answer: Upon your order, we will start to translate GB 31604.21-2025_English as soon as possible, and keep you informed of the progress. The lead time is typically 1 ~ 3 working days. The lengthier the document the longer the lead time.Question 2: Can I share the purchased PDF of GB 31604.21-2025_English with my colleagues?Answer: Yes. The purchased PDF of GB 31604.21-2025_English will be deemed to be sold to your employer/organization who actually pays for it, including your colleagues and your employer's intranet.Question 3: Does the price include tax/VAT?Answer: Yes. 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