GB 31604.41-2016 PDF EnglishUS$85.00 · In stock · Download in 9 seconds
GB 31604.41-2016: National food safety standard - Food Contact Materials and Articles - Determination of Stibium Migration Delivery: 9 seconds. True-PDF full-copy in English & invoice will be downloaded + auto-delivered via email. See step-by-step procedure Status: Valid
Similar standardsGB 31604.41-2016: National food safety standard - Food Contact Materials and Articles - Determination of Stibium Migration---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/GB31604.41-2016 GB NATIONAL STANDARD OF THE PEOPLE’S REPUBLIC OF CHINA National Food Safety Standard - Food Contact Materials and Articles - Determination of Stibium 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 ContentsForeword . 4 1 Scope .. 5 2 Principle.. 5 3 Reagents and materials .. 5 4 Instruments and equipment . 7 5 Analysis steps . 7 6 Expression of analysis results .. 8 7 Precision. 8 8 Other . 8 9 Principle.. 8 10 Reagents and materials. 8 11 Instruments and equipment .. 10 12 Analysis steps .. 10 13 Expression of analysis results . 11 14 Precision .. 11 15 Other .. 11 16 Principle. 11 17 Reagents and materials.. 12 18 Instruments and equipment .. 13 19 Analysis steps .. 13 20 Expression of analysis results . 14 21 Precision .. 15 22 Other .. 15 Annex A Reference heating program of graphite furnace atomic absorption spectrometer . 16 Annex B Reference working conditions of atomic fluorescence spectrometer . 17 National Food Safety Standard - Food Contact Materials and Articles - Determination of Stibium Migration1 ScopeThis Standard specifies the graphite furnace atomic absorption spectrometry, atomic fluorescence spectrometry, inductively coupled plasma mass spectrometry, inductively coupled plasma emission spectrometry, and malachite green spectrophotometry for the determination of stibium migration after food contact materials and articles are soaked in food simulants. This Standard is applicable to the determination of stibium migration in food contact materials and articles. Method One -- Graphite furnace atomic absorption spectrometry 2 Principle Use the food simulant to immerse the parts of food contact materials and articles intended to come into contact with food. Soaking solution is atomized by graphite furnace. The absorption value measured at 231.2 nm is proportional to the cerium content over a range of concentrations. Compare and quantify with the standard series.3 Reagents and materialsUnless otherwise stated, the reagents used in this method are all superior- grade pure, and the water is Grade two water specified in GB/T 6682. 3.1 Reagents 3.1.1 Ammonium dihydrogen phosphate (NH4H2PO4). 3.1.2 Hydrochloric acid (HCl). 3.1.3 Sulfuric acid (H2SO4). 3.1.4 Nitric acid (HNO3).4 Instruments and equipmentNOTE. All glassware needs to be soaked overnight with nitric acid solution (1+5). Rinse clean with water. 4.1 Atomic absorption spectrometer. with graphite furnace atomizer, stibium hollow cathode lamp. 4.2 Analytical balance. resolution of 0.1 mg.5 Analysis steps5.1 Sample pretreatment According to the expected use of the testing sample and the conditions of use, with the migration test methods and test conditions specified in GB 5009.156 and GB 31604.1, the migration test shall be carried out. After the soaking solution is fully mixed, take some soaking test solution for analysis. If the soaking test solution is neutral or alkaline, add appropriate amount of nitric acid to make the concentration of nitric acid in the test solution about 5% (volume fraction). Perform the sample blank test at the same time. 5.2 Determination 5.2.1 Instrument test conditions See Table A.1 for instrument test conditions. 5.2.2 Making of standard curve According to the order of concentration from low to high, pipette 10 μL of standard solution series and 5 μL of ammonium dihydrogen phosphate solution (20 g/L) (the best injection volume can be determined according to the instrument used) into the graphite furnace at the same time. After atomization, determine the absorbance value. Take the standard series concentration as the abscissa, the corresponding absorbance value as the ordinate to draw a standard curve. NOTE. Based on the sensitivity of the instrument, the linear range, and the actual content of deuterium in the sample solution, the concentration and range of stibium in the standard series solution can be determined. 5.2.3 Sample determination Under the same experimental conditions as the determination of standard solution, pipette 10 μL of the sample solution and 5 μL of ammonium dihydrogen phosphate solution (20 g/L) (the best injection volume can be determined 10.1.2 Potassium borohydride (KBH4). 10.1.3 Thiourea (CH4N2S). 10.1.4 Ascorbic acid (C6H8O6). 10.1.5 Hydrochloric acid (HCl). superior-grade pure. 10.1.6 Reagents for preparing food simulants. according to GB 31604.1. 10.2 Reagent preparation 10.2.1 Hydrochloric acid solution (1+9). measure 50 mL of hydrochloric acid, add 450 mL of water, mix well. 10.2.2 Hydrochloric acid solution (5%). measure 10 mL of hydrochloric acid, add water to 200 mL, and mix well. Prepare before use. 10.2.3 Potassium borohydride alkaline solution (20 g/L). weigh 2.5 g of sodium hydroxide dissolved in water, completely dissolve, add 10 g of potassium borohydride, add water to 500 mL, and mix well. Prepare before use. 10.2.4 Thiourea-ascorbic acid solution. respectively pipette 10 g of thiourea and 10 g of ascorbic acid, dissolve in water and add water and set volume to 100 mL. Prepare before use. 10.2.5 Food simulant. prepare in accordance with the provisions of GB 5009.156. 10.3 Standard product Metal stibium (Sb, CAS No. 7440-36-0). purity >99.99% or the standard solution certified by the state and granted with a standard substance certificate. 10.4 Preparation of standard solution 10.4.1 Stibium standard stock solution (500 mg/L). see 3.4.1. 10.4.2 Stibium standard intermediate solution (10.0 mg/L). transfer 2.00 mL of stibium standard stock solution (500 mg/L); place in a 100mL volumetric flask; dilute to the scale with hydrochloric acid solution (1+9); mix well. 10.4.3 Stibium standard use solution (0.100 mg/L). accurately transfer 1.00 mL of standard intermediate solution (10.0 mg/L) into a 100 mL volumetric flask; dilute to the scale with water; mix well. 100mL of water, mix well. 17.3 Standard product Metal strontium (Sb, CAS number. 7440-36-0). purity > 99.99%, or a standard solution that has been certified by the state and granted with a standard substance certificate. 17.4 Preparation of standard solution 17.4.1 Stibium standard stock solution (500 mg/L). same as 3.4.1. 17.4.2 Stibium standard use solution (10.0 mg/L). take 2mL of stibium standard stock solution, dilute to 100mL with sulfuric acid solution (1+5).18 Instruments and equipmentNOTE. All glassware needs to be soaked overnight with nitric acid solution (1+5). Rinse clean with water for use. 18.1 Spectrophotometer. with 1cm cuvette. 18.2 Analytical balance. resolution of 0.1mg.19 Analysis steps19.1 Sample pretreatment Same with 5.1. 19.2 Determination 19.2.1 Making of standard curve Take 0 mL, 0.300 mL, 0.400 mL, 0.600 mL, 0.800 mL, 1.00 mL (equivalent to 0 μg, 3.00 μg, 4.00 μg, 6.00 μg, 8.00 μg, 10.0 μg of stibium) of stibium standard use solutions. Respectively place them in separatory funnels added with 4 mL of water and 4 mL of hydrochloric acid solution (5+1). Add 2 drops of stannous chloride solution (12%). Mix well. Place 5min. Add 1mL of sodium nitrite solution (20%). Mix well. And blow the air with a rubber suction ball to chase the brown nitrogen oxide gas in the separatory funnel. Then add 2.5mL of urea solution (1000 g/L). Shake well and mix thoroughly. Put into the solution and no bubbles escape. Add 1mL of malachite green solution (0.2%). Add 10mL of sodium citrate solution (20%). Then add 5mL of isoamyl acetate. Fully shake for 30s. Place for stratification. Discard the aqueous phase. The organic phase passes through a small funnel pre-filled with a little anhydrous sodium sulfate. The ......Source: Above contents are excerpted from the full-copy PDF -- translated/reviewed by: www.ChineseStandard.net / Wayne Zheng et al. Tips & Frequently Asked Questions:Question 1: How long will the true-PDF of English version of GB 31604.41-2016 be delivered?Answer: The full copy PDF of English version of GB 31604.41-2016 can be downloaded in 9 seconds, and it will also be emailed to you in 9 seconds (double mechanisms to ensure the delivery reliably), with PDF-invoice.Question 2: Can I share the purchased PDF of GB 31604.41-2016_English with my colleagues?Answer: Yes. The purchased PDF of GB 31604.41-2016_English will be deemed to be sold to your employer/organization who actually paid for it, including your colleagues and your employer's intranet.Question 3: Does the price include tax/VAT?Answer: Yes. Our tax invoice, downloaded/delivered in 9 seconds, includes all tax/VAT and complies with 100+ countries' tax regulations (tax exempted in 100+ countries) -- See Avoidance of Double Taxation Agreements (DTAs): List of DTAs signed between Singapore and 100+ countriesQuestion 4: Do you accept my currency other than USD?Answer: Yes. www.ChineseStandard.us -- GB 31604.41-2016 -- Click this link and select your country/currency to pay, the exact amount in your currency will be printed on the invoice. Full PDF will also be downloaded/emailed in 9 seconds.How to buy and download a true PDF of English version of GB 31604.41-2016?A step-by-step guide to download PDF of GB 31604.41-2016_EnglishStep 1: Visit website https://www.ChineseStandard.net (Pay in USD), or https://www.ChineseStandard.us (Pay in any currencies such as Euro, KRW, JPY, AUD).Step 2: Search keyword "GB 31604.41-2016". Step 3: Click "Add to Cart". If multiple PDFs are required, repeat steps 2 and 3 to add up to 12 PDFs to cart. Step 4: Select payment option (Via payment agents Stripe or PayPal). Step 5: Customize Tax Invoice -- Fill up your email etc. Step 6: Click "Checkout". Step 7: Make payment by credit card, PayPal, Google Pay etc. After the payment is completed and in 9 seconds, you will receive 2 emails attached with the purchased PDFs and PDF-invoice, respectively. Step 8: Optional -- Go to download PDF. Step 9: Optional -- Click Open/Download PDF to download PDFs and invoice. See screenshots for above steps: Steps 1~3 Steps 4~6 Step 7 Step 8 Step 9 |
