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GB/T 35824-2018: Determination of 20 kinds of prohibited and restricted dyestuff in hair dyes - 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 35824-2018: Determination of 20 kinds of prohibited and restricted dyestuff in hair dyes - 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/GBT35824-2018 GB NATIONAL STANDARD OF THE PEOPLE’S REPUBLIC OF CHINA ICS 71.100.70 Y 42 Determination of 20 kinds of prohibited and restricted dyestuff in hair dyes - High performance liquid chromatography Issued on: FEBRUARY 06, 2018 Implemented on: SEPTEMBER 01, 2018 Issued by. General Administration of Quality Supervision, Inspection and Quarantine; Standardization Administration of PRC. Table of ContentsForeword ... 3 Introduction ... 4 1 Scope ... 5 2 Normative references ... 5 3 Summary of method ... 5 4 Reagents and materials ... 5 5 Instruments and equipment... 7 6 Preparation of specimen ... 7 7 Analytical procedures ... 8 8 Calculation of results ... 10 9 Recovery rate ... 10 10 Precision ... 10 Appendix A (Informative) Detection limit and limit of quantitation of 20 kinds of prohibited and restricted dyestuff ... 11 Appendix B (Informative) Chinese name, INCI name, CAS number, molecular formula, structural formula, relative molecular mass of 20 kinds of prohibited and restricted dyestuff ... 12 Appendix C (Informative) Liquid chromatogram of standard substances of 20 kinds of prohibited and restricted dyestuff ... 15 Determination of 20 kinds of prohibited and restricted dyestuff in hair dyes - High performance liquid chromatography1 ScopeThis standard specifies the high-performance liquid chromatography method for the determination of 20 kinds of prohibited and restricted dyestuff in hair dyes. This standard applies to the determination of 20 kinds of prohibited and restricted dyestuff in hair dyes. The detection limits and quantification limits for the dyestuff components of this standard are as given in Table A.1 of Appendix A.2 Normative referencesThe following documents are essential to the application of this document. For the dated documents, only the versions with the dates indicated are applicable to this document; for the undated documents, only the latest version (including all the amendments) are applicable to this standard. GB/T 6682 Water for analytical laboratory use - Specification and test methods3 Summary of methodAfter the specimen is extracted by solvent, it is separated by high-performance liquid chromatography, detected by diode array detector, quantified by external standard method.4 Reagents and materialsUnless otherwise stated, the water used is the grade I water as specified in GB/T 6682. 4.1 Standard substances. The Chinese names, INCI names, CAS numbers, molecular formulas, structural formulas, relative molecular masses of the 20 kinds of prohibited and restricted dyestuff are as listed in Table B.1 of Appendix B. 4.2 Methanol. Chromatographically pure. 4.3 Ethanol. Analytically pure. 4.4 Potassium dihydrogen phosphate. Analytically pure. 4.5 Disodium hydrogen phosphate. Analytically pure. 4.6 Sodium bisulfite. Analytically pure. 4.7 Sodium hydrogen sulfite aqueous solution (1 g/L). Weigh 1.00 g (accurate to 0.01 g) of sodium bisulfite (4.6) into a volumetric flask. Add water to make its volume reach to 1000 mL. 4.8 Aqueous ethanol solution. [Ethanol + sodium hydrogen sulfite aqueous solution (4.7)] = 1 + 1 (volume ratio). 4.9 0.05 mol/L phosphate buffer solution. Accurately weigh 6.8045 g (accurate to 0.0001 g) of potassium dihydrogen phosphate (4.4) and 17.907 g (accurate to 0.0001 g) of disodium hydrogen phosphate (4.5) into the volumetric flask. Add water to make its volume reach to 1000 mL. 4.10 Ethanol + 0.05 mol/L phosphate buffer solution = 1 + 49 (volume ratio). 4.11 Ethanol + 0.05 mol/L phosphate buffer solution = 1 + 1 (volume ratio). 4.12 Ethanol + 0.05 mol/L phosphate buffer solution = 5 + 95 (volume ratio). 4.13 Standard stock solution A. Respectively, accurately weigh 50 mg of each standard substance (1,4-diaminobenzene, 1,2-diaminobenzene, 1,3- diaminobenzene, 4-aminophenol, 3-aminophenol, 1,3-dihydroxylbenzene, 4- amino-2-hydroxytoluene, 2-methyl-5-N-hydroxyethylaminophenol, 2-methyl-5- amino-6-chlorophenol, 6-hydroxyindole, 4-chlororesorcinol, hydroxybenzomorpholine , o-aminophenol, 6-amino-m-cresol, 1-naphthol, 1,5- naphthalenediol, 2,7-dihydroxynaphthalene, a total of 17 kinds) (accurate to 0.1 mg) in a brown volumetric flask. Use the ethanol aqueous solution (4.8) to dissolve it to make its volume reach to 10 mL. Prepare it into a standard stock solution which has a concentration of 5 mg/mL. Preserve it at 4 °C ~ 6 °C in the dark. The preservation period is 3 days. Standard stock solution B. Respectively, accurately weigh 50 mg of each standard substance (2-methyl-1,4-benzenediamine sulfate, N,N-bis(2- hydroxyethyl)-p-phenylenediamine sulfate, a total of 2 kinds) (accurate to 0.1 mg) in a brown volumetric flask. Use the sodium bisulfite aqueous solution (4.7) to dissolve it to make its volume reach to 10 mL. Prepare it into a standard stock ethanol + 0.05 mol/L phosphate buffer solution = 5 + 95 (volume ratio) (4.12) to dilute it to make its volume reach to 5 mL. Vortex it for 1 min. Use the 0.45 μm filter membrane to filter the supernatant, to obtain the determination solution. Use the high-performance liquid chromatography for determination. Method 2. Accurately weigh 1.0 g of sample (accurate to 0.001 g) in a 25 mL graduated plastic centrifuge tube with stopper. Add the mixed solution of ethanol + 0.05 mol/L phosphate buffer solution = 1 + 49 (volume ratio) (4.10) to make its volume reach to 25 mL. Vigorously shake it to disperse the sample. Vortex it for 1 min. Ultrasonic it for 15 min. Centrifuge it at 5000 r/min for 10 min. Use the 0.45 μm filter membrane to filter the supernatant, to obtain the determination solution. Use the high-performance liquid chromatography for determination. Note. Is it suitable for the separation of the following 13 dyestuffs. 1,4- diaminobenzene, 1,2-diaminobenzene, 1,3-diaminobenzene, 4-aminophenol, m-aminophenol, 1,3-dihydroxylbenzene, 4-amino-2-hydroxytoluene, hydroxybenzomorpholine, o-aminophenol, 6-amino-m-cresol, 2-methyl-1,4- benzenediamine sulfate, N,N-bis(2-hydroxyethyl)-p-phenylenediamine sulfate, 4-nitro-o-phenylenediamine. Method 3. Accurately weigh 1.0 g of sample (accurate to 0.001 g) in a 25 mL graduated plastic centrifuge tube with stopper. Add the mixed solution of ethanol + 0.05 mol/L phosphate buffer solution = 1 + 1 (volume ratio) (4.11) to make its volume reach to 25 mL. Vigorous shake it to disperse the sample. Vortex it for 1 min. Ultrasonic it for 15 min. Centrifuge it at 5000 r/min for 10 min. Use the 0.45 μm filter membrane to filter the supernatant, to obtain the determination solution. Use the high-performance liquid chromatography for determination. Note. It is suitable for the separation of the following 7 dyestuffs. 2-methyl-5-N- hydroxyethylaminophenol, 2-methyl-5-amino-6-chlorophenol, 6-hydroxyindole, 4-chlororesorcinol, 1-naphthol, 1,5-naphthalenediol, 2,7-dihydroxynaphthalene.7 Analytical procedures7.1 Reference conditions for liquid chromatography The reference conditions for liquid chromatography are as follows. a) Column. Poroshell HPH C18, 2.7 μm, 3.0 mm × 100 mm (or equivalent); b) Column’s temperature. 30 °C; c) Detector. 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