GB/T 35948-2018: Translated English of Chinese Standard. (GBT 35948-2018, GB/T35948-2018, GBT35948-2018): Determination of seven parabens in cosmetics - High performance liquid chromatography
https://www.chinesestandard.net, 2019 M02 16 - 14 pages
This Standard specifies the reagents and materials, apparatus, analytical procedures, result calculation, recovery and accuracy, admissible error, etc. for the determination of seven parabens in cosmetics using high performance liquid chromatography, including propylparaben, isopropylparaben, butylparaben, isobutylparaben, phenylparaben, benzylparaben and pentylparaben.
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0.5 g accurate accurate to 0.001 acetonitrile 4.2 acetonitrile to extract add 4 mL add to metered benzylparaben and pentylparaben butylparaben carry out determination carry out ultrasonic CAS numbers Chinese names chromatogram and quantitative chromatographically pure conditions for high constitutional formulas cosmetics of creams cyclohexane determination after filtering determination of seven emulsions English names ethanol 95 extraction for 15 Figure B.1 filter membrane 4.8 filtering using filter formulas of paraben GB/T graduated centrifugal tube high performance liquid isobutylparaben liquid chromatograms mass concentration masses and constitutional metered volume mg/kg mg/L mL graduated centrifugal mL of acetonitrile mL of solution molecular formulas paraben standard substance parabens in cosmetics performance liquid chromatography phenylparaben prohibited substances quantitative analysis r/min relative molecular masses sample solution seven paraben standard solutions of seven standard stock solutions standard substance solution standard working curve Take 2 mL tested constituents ultrasonic extraction vibrate to mix vortex mixer wax base Weigh 0.5 g