GB/T 35950-2018 Translated English of Chinese Standard. (GBT 35950-2018, GB/T35950-2018, GBT35950-2018): Determination of Inorganic Sulfites and Bisulfites in Cosmeticshttps://www.chinesestandard.net, 2019 M07 12 - 15 páginas This Standard specifies the reagents and materials, instruments and apparatuses, analysis steps, result calculation, recovery and precision, allowable difference and the like of titration and ion chromatography of the determination of sulfites and bisulfites in cosmetics. This Standard applies to the determination of sulfites and bisulfites in cosmetics. For the contents of sulfites and bisulfites, the quantitation-limit of titration in this Standard is 50 mg/kg; the detection-limit of ion chromatography is 2 mg/kg, and the quantitation-limit is 10 mg/kg. |
Términos y frases comunes
100 mL volumetric according to Formula accurately transfer acetonitrile Allowable difference Analysis steps Analytical balance analytical reagents arithmetic mean based on sulfur bisulfites in cosmetics blank test calculated as sulfur conductivity detector contents of sulfites determine the sample distilled water 3.2.1 Eluent fix-volume Flowmeter GB/T grade-2 standard intermediate hydrogen peroxide hydroxide standard solution inorganic sulfites Instruments and apparatuses Iodine standard solution L/min liter mg/L materials Unless otherwise Methanol Methyl red mg/L content based milligrams milliliters mL mL of distilled mL of sodium mL volumetric flask mol/L pear-shaped flask phosphoric acid Pipette potassium hydroxide Reagents and materials Recovery and precision relative standard deviation Result calculation sample calculated sample solution sodium hydroxide standard Sodium sulfite grade-1 sodium sulfite standard sodium thiosulfate standard standard curve standard intermediate solution standard solution c(NaOH sulfite grade-2 standard sulfite standard solution sulfites and bisulfites sulfur dioxide sulfuric acid Suppressor thiosulfate standard solution volume of sodium water to dilute