GB/T 34436-2023 PDF EnglishUS$170.00 · In stock · Download in 9 seconds
GB/T 34436-2023: Determination of formamide in toy materials - High performance liquid chromatography-mass spectrometry Delivery: 9 seconds. True-PDF full-copy in English & invoice will be downloaded + auto-delivered via email. See step-by-step procedure Status: Valid GB/T 34436: Historical versions
Similar standardsGB/T 34436-2023: Determination of formamide in toy materials - High performance liquid chromatography-mass spectrometry---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/GBT34436-2023 GB NATIONAL STANDARD OF THE PEOPLE’S REPUBLIC OF CHINA ICS 97.200.50 CCS Y 57 Replacing GB/T 34436-2017 Determination of formamide in toy materials - High performance liquid chromatography-mass spectrometry ISSUED ON: MARCH 17, 2023 IMPLEMENTED ON: OCTOBER 1, 2023 Issued by: State Administration for Market Regulation; Standardization Administration of the PRC. Table of ContentsForeword ... 3 1 Scope ... 5 2 Normative references ... 5 3 Terms and definitions ... 5 4 Principle ... 5 5 Reagents or materials ... 6 6 Apparatus ... 6 7 Sample preparation ... 6 8 Sample extraction ... 7 9 Determination ... 7 10 Result calculation ... 7 11 Method limit of quantitation ... 8 12 Precision ... 8 13 Test report ... 8 Appendix A (Informative) Reference working conditions of high performance liquid chromatograph-mass spectrometer for the determination of formamide ... 10 Appendix B (Informative) Precision test results... 12 Determination of formamide in toy materials - High performance liquid chromatography-mass spectrometry IMPORTANT NOTE: The use of this document may involve certain hazardous materials, procedures and equipment; but not all safety issues related thereto are recommended. It is the user's responsibility to, before applying this document, establish appropriate safety and protection measures AND determine the applicability of relevant regulatory limitations.1 ScopeThis document describes a method for the determination of formamide in toy materials using high performance liquid chromatograph-mass spectrometer. This document is applicable to the determination of formamide in foam materials such as ethylene-vinyl acetate copolymer (EVA), polyethylene (PE), chemically cross-linked polyethylene (XPE), and polyvinyl chloride (PVC) in toy products. It is used as a reference for the determination of formamide in other foam materials.2 Normative referencesThe contents of the following documents, through normative references in this text, constitute indispensable provisions of this document. Among them, for dated references, only the edition corresponding to that date applies to this document. For undated references, the latest edition (including all amendments) applies to this document. GB/T 6682 Water for analytical laboratory use - Specification and test methods3 Terms and definitionsThere are no terms and definitions that need to be defined in this document.4 PrincipleUse water to ultrasonically extract the prepared samples. After filtering the extract, use high performance liquid chromatograph-mass spectrometer to determine; use external standard method to quantify.8 Sample extractionWeigh two specimens of about 0.1 g (accurate to 0.1 mg) into the glass sample vial (6.4); accurately add 10 mL of water (5.1) and seal. After fully infiltrating the specimen, place it in an ultrasonic generator (6.2) for ultrasonic extraction for 3.5 h; cool to room temperature; use an organic microporous membrane (6.6) to filter it; wait for the determination.9 Determination9.1 Reference working conditions for high performance liquid chromatograph- mass spectrometer Since the setting of working conditions depends on the instrument used, the set parameters shall ensure the effective separation of formamide chromatographic peaks. Appendix A gives the reference working conditions of high performance liquid chromatograph-mass spectrometer for the determination of formamide. 9.2 Qualitative analysis According to the above analysis conditions (9.1), analyze the standard working solution (5.6) and the sample extract; use the retention time of characteristic ions and chromatographic peaks (see Figure A.1 in Appendix A) for qualitative analysis. If the selected ion proton number/charge number (m/z) is 46.0, the retention time of the detected chromatographic peak is consistent with that of the standard solution; it can be considered that the sample contains the target component. 9.3 Quantitative analysis Use the external standard method for quantitative analysis. Use the mass concentration of the standard working solution as the abscissa; use the quantitative ion peak area of the compound as the ordinate; draw the standard working curve; obtain the regression equation of the standard curve, to calculate the formamide content in the sample. If the specimen response value exceeds the linear range, it is necessary to dilute the specimen by an appropriate multiple AND re-inject the specimen for analysis. 9.4 Blank test Except that no specimen is added, follow the above operation steps.10 Result calculationAccording to the formula (1), calculate the content of formamide in the specimen. Where: w - The content of formamide in the specimen, in milligrams per kilogram (mg/kg); c - The mass concentration of formamide in the sample solution, in milligrams per liter (mg/L); c0 - The mass concentration of formamide in the blank test, in milligrams per liter (mg/L); V - The volume of the extract, in milliliters (mL); D - The dilution factor of the extract; m - The mass of specimen weighed, in grams (g). The calculation result retains 3 significant figures.11 Method limit of quantitationWhen the sampling size is 0.1 g and the extraction solution volume is 10 mL, the quantitation limit of this method is 10.0 mg/kg.12 PrecisionIn the same laboratory, using the same equipment by the same operator, according to the same test method, within a short period of time, by independently testing the same measured object; the absolute difference between the two independent test results obtained is not greater than 10% of the arithmetic mean of the two measured values; provided that no more than 5% of the cases are greater than 10% of the arithmetic mean of these two measured values. See Appendix B for the precision test data of the method in this document.13 Test reportThe test report shall at least provide the following content: a) Specimen description; b) Number of this document; ......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 34436-2023 be delivered?Answer: The full copy PDF of English version of GB/T 34436-2023 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 34436-2023_English with my colleagues?Answer: Yes. The purchased PDF of GB/T 34436-2023_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 34436-2023 -- 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.Question 5: Should I purchase the latest version GB/T 34436-2023?Answer: Yes. Unless special scenarios such as technical constraints or academic study, you should always prioritize to purchase the latest version GB/T 34436-2023 even if the enforcement date is in future. Complying with the latest version means that, by default, it also complies with all the earlier versions, technically.How to buy and download a true PDF of English version of GB/T 34436-2023?A step-by-step guide to download PDF of GB/T 34436-2023_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 34436-2023". 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 |
