GB/T 37638-2019 PDF EnglishUS$150.00 · In stock · Download in 9 seconds
GB/T 37638-2019: Determination of Polybrominated Biphenyls and Polybrominated Diphenyl Ethers in Plastic Products - High Performance Liquid Chromatography 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/T 37638-2019: Determination of Polybrominated Biphenyls and Polybrominated Diphenyl Ethers in Plastic Products - High Performance Liquid Chromatography---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/GBT37638-2019 NATIONAL STANDARD OF THE PEOPLE’S REPUBLIC OF CHINA ICS 83.080 G 31 Determination of Polybrominated Biphenyls and Polybrominated Diphenyl Ethers in Plastic Products - High Performance Liquid Chromatography ISSUED ON: JUNE 4, 2019 IMPLEMENTED ON: JANUARY 1, 2020 Issued by: State Administration for Market Regulation; Standardization Administration of the People’s Republic of China. Table of ContentsForeword ... 3 1 Scope ... 4 2 Principle ... 5 3 Reagents and Materials ... 5 4 Instruments and Equipment ... 5 5 Sample Preparation ... 6 6 Analytical Procedures ... 6 7 Result Calculation ... 8 8 Detection Limit ... 9 9 Precision ... 9 10 Recovery Rate ... 9 11 Test Report ... 9 Appendix A (informative) Typical Chromatogram of PBBs Standard Samples ... 10 Appendix B (informative) Typical Chromatogram of PBDEs Standard Samples ... 11 Determination of Polybrominated Biphenyls and Polybrominated Diphenyl Ethers in Plastic Products - High Performance Liquid Chromatography1 ScopeThis Standard stipulates the high performance liquid chromatography for polybrominated biphenyls (abbreviation: PBBs; please refer to Figure 1 for its structural formula) and polybrominated diphenyl ethers (abbreviation: PBDEs; please refer to Figure 2 for its structural formula). This Standard is applicable to the determination of polybrominated biphenyls and polybrominated diphenyl ethers in plastic products. Figure 1 -- Structure of Polybrominated Biphenyls Figure 2 -- Structure of Polybrominated Diphenyl Ethers 4.4 Rotary evaporator. 4.5 Pulverizer. 4.6 Solid-phase extraction device. 4.7 Constant-temperature water bath (temperature accuracy shall be less than 1 °C). 4.8 Analytical balance (accurate to: 0.0001 g). 4.9 Centrifuge. 4.10 Closed microwave extractor. 4.11 Organic-phase filtration membrane: 0.45 μm filtration membrane.5 Sample PreparationIn accordance with product’s property, through the modes of clipping, crushing or liquid nitrogen freezing and pulverization, prepare sample into particles with the particle size of less than 1 mm.6 Analytical Procedures6.1 Extraction Extraction includes the following three methods: a) Soxhlet extraction method: on the analytical balance, accurately weigh-take 0.1 g of sample (accurate to 1 mg); place it into a filtration paper cylinder. Add 150 mL of dichloromethane solution, then, control the water bath temperature at 60 °C ± 5 °C. At the rate of 2 drops/s ~ 3 drops/s, conduct extraction for over 12 h. After the extraction is completed, in terms of relatively clean sample or slightly turbid sample, which can be improved through the adding of methanol, use the rotary evaporator to concentrate the extract and reach a constant volume of 100 mL. Then, use 0.45 μm filtration membrane (see 4.11) to filter it; directly analyze it. In terms of dark-colored sample with a lot of impurities, use the rotary evaporator to concentrate the extract to a smaller volume, then, conduct purification treatment in accordance with 6.2. b) Microwave extraction method: accurately weigh-take 0.5 g ~ 2 g of sample, which is already pulverized, accurate to 1 mg. Place it into an extraction tank, then, accurately transfer-take 20 mL of methylbenzene-methanol (see 3.7); seal it up and place it in the microwave extractor (see 4.10). Within 5 min, raise the temperature to 115 °C, maintain for over 15 min, then, cool it down to the room temperature. Completely transfer the extract; use the extracting solvent e) Flow rate: 1.0 mL/min; f) Injection volume: 20 μL. 6.3.2 Liquid chromatographic determination In accordance with the PBBs and PBDEs content being tested in the sample solution, select a standard solution (see 3.6) with an approximate concentration, conduct iso- volumetric interspersed sample injection. The response value of PBBs and PBDEs in the standard solution and the sample solution to be tested shall be within the linear range of the standard solution. In accordance with the chromatographic peak area, use external standard method to quantify it. Please refer to Figure A.1 in Appendix 1 and Figure B.1 in Appendix B for the typical chromatogram of some PBBs and PBDEs standard substances. 6.3.3 Blank test Except from the step of adding sample, comply with the other above-mentioned steps for determination.7 Result CalculationIn accordance with Formula (1), calculate the mass fraction of PBB or PBDE in the sample: Where, w---mass fraction of PBBs/PBDEs in the sample, expressed in (mg/kg); Ai---chromatographic peak area of PBBs and PBDEs in the sample solution; A0---chromatographic peak area in the blank sample; A---chromatographic peak area of PBBs and PBDEs in the standard working solution; ---mass concentration of PBBs and PBDEs in the standard working solution, expressed in (mg/L); V---final constant volume of the sample solution, expressed in (mL); m---sample mass represented by the final sample solution, expressed in (g). The calculation result shall retain 3 significant figures. The ratio of the difference value between two determination results and the arithmetic mean value shall not exceed 10%. ......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/T 37638-2019 be delivered?Answer: The full copy PDF of English version of GB/T 37638-2019 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/T 37638-2019_English with my colleagues?Answer: Yes. The purchased PDF of GB/T 37638-2019_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/T 37638-2019 -- 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/T 37638-2019?A step-by-step guide to download PDF of GB/T 37638-2019_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/T 37638-2019". 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 |
