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 chromatographyhttps://www.chinesestandard.net, 16/02/2019 - 14 páginas 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 100 mL brown accurate to 0.001 acetonitrile 4.2 add 4 mL add to metered benzylparaben and pentylparaben brown volumetric flask butylparaben carry out determination carry out ultrasonic CAS numbers Chinese names 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 Figures B.2 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 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 on vortex vortex mixer wax base Weigh 0.5 g