SN/T 1781-2023 English PDFUS$319.00 · In stock
Delivery: <= 4 days. True-PDF full-copy in English will be manually translated and delivered via email. SN/T 1781-2023: (Determination of Caffeine in Imported and Exported Cosmetics) Status: Valid SN/T 1781: Historical versions
Basic dataStandard ID: SN/T 1781-2023 (SN/T1781-2023)Description (Translated English): (Determination of Caffeine in Imported and Exported Cosmetics) Sector / Industry: Commodity Inspection Standard (Recommended) Classification of Chinese Standard: Y42 Classification of International Standard: 71.100.70 Word Count Estimation: 16,177 Date of Issue: 2023-05-05 Date of Implementation: 2023-12-01 Issuing agency(ies): General Administration of Customs SN/T 1781-2006: Determination of caffeine in cosmetics for import and export. Liquid chromatography method---This is a DRAFT version for illustration, not a final translation. Full copy of true-PDF in English version (including equations, symbols, images, flow-chart, tables, and figures etc.) will be manually/carefully translated upon your order. Determination of caffeine in cosmetics for import and export.Liquid chromatography method People's Republic of China Entry-Exit Inspection and Quarantine Industry Standard Determination of caffeine in cosmetics for import and export Liquid chromatography Released on.2006-04-25 Implementation of.2006-11-15 People's Republic The General Administration of Quality Supervision, Inspection and Quarantine issued ForewordAppendix A and Appendix B of this standard are informative annexes. This standard is proposed and managed by the National Certification and Accreditation Administration. This standard was drafted by the China Academy of Inspection and Quarantine. The main drafters of this standard. Wang Xing, Yu Wenlian, Wang Chao, Zhu Xi, Cui Yanni. This standard is the first industry standard for entry-exit inspection and quarantine. Determination of caffeine in cosmetics for import and export Liquid chromatography1 ScopeThis standard specifies the liquid chromatography method for the determination of caffeine in cosmetics. This standard applies to the detection of caffeine in cosmetics. The lower limit of caffeine determination in this standard. 10mg/kg.2 Normative referencesThe terms in the following documents become the terms of this standard by reference to this standard. All dated references, followed by all Modifications (not including errata content) or revisions do not apply to this standard, however, parties to agreements based on this standard are encouraged to study Is it possible to use the latest version of these files? For undated references, the latest edition applies to this standard. GB/T 6379 Accuracy of measurement methods and results (correctness and precision) (all parts)3 PrincipleThe caffeine in the cosmetics was ultrasonically extracted with methanol, centrifuged, and the supernatant was filtered, and determined by a liquid chromatograph equipped with a UV detector. Qualitative according to its retention time, quantified by the standard working curve method.4 reagents and materialsUnless otherwise stated, the reagents used were of analytical grade and the water was ultrapure water. 4.1 Methanol. excellent grade or chromatographically pure. 4.2 Standard. caffeine. purity ≥ 99.5%. 4.3 Caffeine standard stock solution (500mg/L). accurately weigh 0.05g caffeine, accurate to 0.0001g, in 50mL beaker, use Dissolve the appropriate amount of methanol, transfer the solution into a 100 mL volumetric flask, dilute to volume with methanol, and mix. 4.4 Caffeine standard working solution. accurately transfer caffeine standard stock solution (500mg/L) (4.3) 0.05mL, 0.5mL, 2.5mL, 5mL, 10mL to 25mL volumetric flask, diluted to the mark with methanol, shake well, that is, get 1mg/L, 10mg/L, 50mg/L, 100mg/L,.200mg/L series standard working solution; stored at 4 °C, can be used for one week.5 instruments5.1 Liquid chromatograph with UV detector. 5.2 Ultrasonic cleaning instrument. 5.3 High speed centrifuge. 5.4 Injection sample filter (organic solvent type, pore size 0.45 μm). 5.5 Erlenmeyer. Grinding plug, 50mL.6 Determination steps6.1 Treatment of samples Weigh 0.5g of cosmetics to the nearest 0.001g, place in a 50mL Erlenmeyer flask, accurately add 8mL of methanol, on the ultrasonic cleaner After sonication for 20 min, transfer the solution to a 10 mL colorimetric tube, dilute to the mark with methanol, and mix. Move the solution into the centrifuge tube, at After centrifugation at 12000 r/min for 10 min, the supernatant was filtered through a 0.45 μm syringe filter and the filtrate was used for measurement. ...... |
