GB/T 35894-2018 PDF EnglishUS$125.00 · In stock · Download in 9 seconds
GB/T 35894-2018: Determination of 10 Forbidden Glycol Ethers and Esters in Cosmetics - GC-MS 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 35894-2018: Determination of 10 Forbidden Glycol Ethers and Esters in Cosmetics - GC-MS---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/GBT35894-2018GB NATIONAL STANDARD OF THE PEOPLE’S REPUBLIC OF CHINA ICS 71.100.70 Y 42 Determination of 10 Forbidden Glycol Ethers and Esters in Cosmetics - GC-MS Issued on: FEBRUARY 6, 2018 Implemented on: SEPTEMBER 1, 2018 Issued by. General Administration of Quality Supervision, Inspection and Quarantine; Standardization Administration of the People’s Republic of China. Table of ContentsForeword ... 3 Introduction ... 4 1 Scope ... 5 2 Principle ... 5 3 Reagents and Materials ... 5 4 Reagents and Materials ... 6 5 Analytical Procedures ... 6 6 Result Calculation ... 8 7 Recovery Rate and Precision ... 9 8 Allowable Deviation ... 9 Appendix A (Informative) Detection Limit and Quantitation Limit of This Method ... 10 Appendix B (Informative) Chinese Name, English Name, CAS No., Molecular Formula, Relative Molecular Mass and Chemical Structural Formula of 10 Forbidden Glycol Ethers and Esters ... 11 Appendix C (Informative) Quantitative and Qualitative Selected Ion Parameters of 10 Forbidden Glycol Ethers and Esters ... 12 Appendix D (Informative) Gas Chromatography-Mass Spectrometry Selected Ion Chromatogram of Standard Substances of 10 Forbidden Glycol Ethers and Esters ... 13 Determination of 10 Forbidden Glycol Ethers and Esters in Cosmetics - GC-MS1 ScopeThis Standard specifies reagents and materials, instruments and equipment, analytical procedures, result calculation, recovery rate and precision, and allowable deviation of gas chromatography-mass spectrometry method of determining 10 forbidden glycol ethers (ethylene glycol dimethyl ether, 2-methoxy ethanol, 2-methoxy propanol, 2- ethoxyethanol, 2-methoxy propyl acetate, 2-methoxyethyl acetate, 2-ethoxy ethyl acetate, dimethoxy diglycol, 2-(2-methoxye-thoxy) ethanol, triethylene glycol dimethyl ether) and their ester compounds in cosmetics. This Standard is applicable to the determination of the content of 10 forbidden glycol ethers and their ester compounds in cosmetics. Please refer to Table A.1 in Appendix A for the detection limit and quantitation limit of the method in this Standard.2 PrincipleSample goes through ultrasonic extraction with ethyl acetate-methanol mixed solvent. Adopt gas chromatograph-mass spectrometer for determination; quantify through the external standard method.3 Reagents and MaterialsUnless it is otherwise indicated, all reagents being adopted shall be analytical pure. 3.1 Ethyl acetate. chromatographic purity. 3.2 Methanol. chromatographic purity. 3.3 Anhydrous sodium sulfate. 3.4 20% ethyl acetate methanol solution (V/V, volume ratio). measure-take 200 mL of ethyl acetate (3.1), then, mix it up with 800 mL of methanol (3.2). 3.5 Standard samples/substances of 10 forbidden glycol ethers and esters. purity shall be not less than 98%. Please refer to Table B.1 in Appendix B for the Chinese name, English name, CAS No., molecular formula, relative molecular mass and chemical same as the procedures of non-waxy based sample treatment. 5.2 Determination Since the determination result depends on the instrument being adopted, it is impossible to provide general parameters of gas chromatography-mass spectrometry analysis. The set parameters shall guarantee that the tested components and the other components can be effectively separated in chromatographic determination. The reference conditions of gas chromatography-mass spectrometry are as follows. a) Chromatographic column. VF-WAX column, 60 m x 0.25 mm (i.d.) x 0.25 μm, or other equivalents; b) Inlet temperature. 220 °C; c) Transmission line temperature. 280 °C; d) Inlet mode. split injection, split ratio. 5.1; e) Carrier gas. helium, purity ≥ 99.999%; mode of control. constant flow; flow rate. 1.0 mL/min; f) Column temperature. initial temperature. 50 °C, maintain for 7 min; rise to 140 °C at 5 °C/min, maintain for 1 min; rise to 240 °C at 20 °C/min, maintain for 2 min. Post-treatment temperature. 245 °C, duration. 3 min. g) Inlet volume. 1 μL. h) Ionization source. EI source; i) Ionization energy. 70 eV; j) Quadrupole temperature. 150 °C; k) Ionization source temperature. 230 °C; l) Solvent delay time. 7.8 min; m) Mode of monitoring. select ion scanning mode (SIM); please refer to Table C.1 in Appendix C for monitoring ions. 5.3 Blank Test Other than sample-weighing, comply with procedure 5.1 and procedure 5.2. 5.4 Qualitative Confirmation Under the instrument conditions in 5.2, the selected ion chromatographic peak of the tested sample and the standard solution emerges in the same retention time, and the V---the constant volume of the sample, expressed in (mL); m---the sample mass represented by the ultimate test solution, expressed in (g). The calculation result shall retain 3 significant figures.7 Recovery Rate and PrecisionNon-waxy based sample shall be within the fortified concentration range of 2.0 mg/kg ~ 30 mg/kg; within the recovery rate of 80% ~ 110%; its relative standard deviation shall be less than 10%. Waxy-based sample shall be within the fortified concentration range of 3.0 mg/kg ~ 60 mg/kg; within the recovery rate of 80% ~ 110%; its relative standard deviation shall be less than 10%.8 Allowable DeviationThe absolute difference of two independent determination results obtained under repeatability conditions shall not exceed 10% of the arithmetic mean value. ......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 35894-2018 be delivered?Answer: The full copy PDF of English version of GB/T 35894-2018 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 35894-2018_English with my colleagues?Answer: Yes. 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