GB/T 21914-2008 English PDFUS$239.00 · In stock
Delivery: <= 3 days. True-PDF full-copy in English will be manually translated and delivered via email. GB/T 21914-2008: Determination of Benzyl Acetate in tea-drink -- Gas chromatography method Status: Obsolete
Basic dataStandard ID: GB/T 21914-2008 (GB/T21914-2008)Description (Translated English): Determination of Benzyl Acetate in tea-drink -- Gas chromatography method Sector / Industry: National Standard (Recommended) Classification of Chinese Standard: X55 Classification of International Standard: 67.160 Word Count Estimation: 6,641 Date of Issue: 2008-05-16 Date of Implementation: 2008-11-01 Regulation (derived from): National Standard Approval Announcement 2008 No.9 (Total No.122) Issuing agency(ies): General Administration of Quality Supervision, Inspection and Quarantine of the People's Republic of China, Standardization Administration of the People's Republic of China Summary: This standard specifies the gas chromatographic method tea drinks benzyl acetate. This standard applies to the determination of the tea beverage benzyl acetate. This standard detection limit of 0. 005 mg/kg. GB/T 21914-2008: Determination of Benzyl Acetate in tea-drink -- Gas 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 Benzyl Acetate in tea-drink. Gas chromatography method ICS 67.160 X55 National Standards of People's Republic of China Tea Drink by Gas Chromatography benzyl acetate Posted 2008-05-16 2008-11-01 implementation Administration of Quality Supervision, Inspection and Quarantine of People's Republic of China Standardization Administration of China released ForewordAppendix A of this standard is an informative annex. This standard by the national food safety emergency standardization working group proposed and managed. This standard was drafted. Shenyang Product Quality Supervision and Inspection Centre (Country processed foods and additives Quality Supervision and Inspection Center). The main drafters of this standard. Suxi Hui, Du Cuirong, Zhaoli Xiu, Zhang Fengqing, Huang Shijun, Lu Cheng-Xue, Zhang Lijun, Zhao seized, Zhouzhang Min, Li Mei. Tea Drink by Gas Chromatography benzyl acetate1 ScopeThis standard specifies the gas chromatographic method tea drinks benzyl acetate. This standard applies to the determination of tea in benzyl acetate. The standard detection limit of 0.005mg/kg. Principle 2 After tea extract benzyl acetate by volume, n-dodecyl and separated from other components in the column and the internal standard, using a hydrogen flame ionization Detector, within the standard method.3 Reagents3.1 dichloromethane. AR. 3.2 ethanol. AR. Benzyl acetate 3.3. Content ≥98%. 3.4 n-dodecyl. Content ≥98%. 3.5 preparation of standard solution 3.5.1 benzyl acetate stock standard solution (1000μg/mL). Weigh 100mg (accurate to 0.1mg) benzyl acetate, constant volume with ethanol To 100mL. 3.5.2 The use of benzyl acetate solution. benzyl acetate stock solutions were diluted with dichloromethane to a concentration of benzyl acetate 0.80,6.40,12.80, 80.0,160.0μg/mL, temporary use when the existing service. 3.5.3 n-dodecane internal standard solution (200μg/mL). Take 20mg (accurate to 0.1mg) n-dodecane with dichloromethane and dilute to 100mL, When we use the existing service.4 Instrument4.1 Gas chromatograph. equipped with a flame ionization detector. 4.2 Injector. micro syringe, 5μL. 4.3 meter dry nitrogen. 4.4 Analysis of balance. a sense of the amount of 0.1mg and 0.01g. 4.5 125mL separating funnel. 4.6 5mL with stopper colorimetric tubes, 50mL graduated test tube. Step 5 Analysis 5.1 Sample Extraction Accurately weigh 40g (accurate to 0.01g) tea drinks in 125mL separating funnel, dichloromethane was added 20mL, shaking 1min, quiet Set stratified, directly dichloromethane layer was slowly dropped into the funnel (bottom a little cotton, above 10g anhydrous sodium sulfate) dehydration collected by filtration to 50mL graduated test tube, and then to a separating funnel was added 20mL of dichloromethane, shaking 1min, standing layered above were collected by filtration, the After the funnel was rinsed with a small amount of methylene chloride three times. Collection was concentrated dried with nitrogen meter (30 ℃) to about 3mL, with a small amount of methylene chloride It is fully transferred to 5mL colorimetric tube, accurately added 1mL of 200μg/mL n-dodecyl, and mix tested. Add 8mg/kg acetic acid Tea drinks gas chromatogram see FIG benzyl ester A. 1. ......Tips & Frequently Asked Questions:Question 1: How long will the true-PDF of GB/T 21914-2008_English be delivered?Answer: Upon your order, we will start to translate GB/T 21914-2008_English as soon as possible, and keep you informed of the progress. The lead time is typically 1 ~ 3 working days. The lengthier the document the longer the lead time.Question 2: Can I share the purchased PDF of GB/T 21914-2008_English with my colleagues?Answer: Yes. The purchased PDF of GB/T 21914-2008_English will be deemed to be sold to your employer/organization who actually pays for it, including your colleagues and your employer's intranet.Question 3: Does the price include tax/VAT?Answer: Yes. 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