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GB/T 40955-2021 English PDF

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US$189.00 · In stock
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GB/T 40955-2021: Determination of octamethylcyclotetrasiloxane(D4) and decamethylcyclopentasiloxane(D5) in cosmetics - Gas chromatography
Status: Valid

Standard ID	USD	BUY PDF	Lead-Days	Standard Title (Description)	Status
GB/T 40955-2021	189	Add to Cart	3 days	Determination of octamethylcyclotetrasiloxane(D4) and decamethylcyclopentasiloxane(D5) in cosmetics - Gas chromatography	Valid

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Basic data

Standard ID: GB/T 40955-2021 (GB/T40955-2021)
Description (Translated English): Determination of octamethylcyclotetrasiloxane(D4) and decamethylcyclopentasiloxane(D5) in cosmetics - Gas chromatography
Sector / Industry: National Standard (Recommended)
Classification of Chinese Standard: Y42
Word Count Estimation: 10,178
Issuing agency(ies): State Administration for Market Regulation, China National Standardization Administration

GB/T 40955-2021: Determination of octamethylcyclotetrasiloxane(D4) and decamethylcyclopentasiloxane(D5) in cosmetics - Gas chromatography

---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 octamethylcyclotetrasiloxane(D4) and decamethylcyclopentasiloxane(D5) in cosmetics - Gas chromatography ICS 71.100.70 CCSY42 National Standards of People's Republic of China Octamethylcyclotetrasiloxane (D4) and decamethyl in cosmetics Determination of cyclopentasiloxane (D5) by gas chromatography Released on 2021-11-26 2022-06-01 implementation State Administration for Market Regulation Issued by the National Standardization Management Committee

Foreword

This document is in accordance with the provisions of GB/T 1.1-2020 "Guidelines for Standardization Work Part 1.Structure and Drafting Rules of Standardization Documents" Drafting. Please note that some of the contents of this document may involve patents. The issuing agency of this document is not responsible for identifying patents. This document was proposed and managed by the National Standardization Technical Committee on Inspection Methods for Key Products of Quality Supervision (SAC/TC374). Drafting organizations of this document. Guangzhou Institute of Quality Supervision and Inspection, CCIC Warner (Beijing) Quality Technology Center Co., Ltd., Hua'antang Bio Technology Group Co., Ltd., Shuiyang Group Co., Ltd., Perfect (Guangdong) Commodity Co., Ltd., Guangzhou Jintong Biological Technology Co., Ltd., Warner Pass (Beijing) Certification Co., Ltd. The main drafters of this document. Wu Shuhuan, Wang Jicai, Xiong Xiaoting, Xia Zemin, Tan Jianhua, Li Xinyu, Li Lu, Zhao Tiantian, Liang Wenyao, Wang Yaru, Nie Mingxia, Xi Shaofeng, Meng Jie, Ai Yong, Dai Yuefeng, Huang Ruijuan, Wu Kaihua, Kong Lingchao, Zheng Cunzhe. Octamethylcyclotetrasiloxane (D4) and decamethyl in cosmetics Determination of cyclopentasiloxane (D5) by gas chromatography

1 Scope

This document specifies the principle of gas chromatography for the determination of octamethylcyclotetrasiloxane (D4) and decamethylcyclopentasiloxane (D5) in cosmetics, Reagents and materials, instruments and equipment, measurement procedures, calculation of results, recovery rate and precision, tolerances. This document is applicable to octamethylcyclotetrasiloxane (D4) and octamethylcyclotetrasiloxane (D4) and Determination of decamethylcyclopentasiloxane (D5).

2 Normative references

There are no normative references in this document.

3 Terms and definitions

There are no terms and definitions that need to be defined in this document.

4 Principle

After the sample is dispersed in isopropanol and extracted with n-hexane, it is determined by gas chromatograph, qualitatively by retention time, quantified by external standard method, and if necessary, by gas Confirmed by gas chromatography-mass spectrometry.

5 Reagents and materials

Unless otherwise specified, only use chromatographically pure reagents. 5.1 Isopropanol. 5.2 n-hexane. 5.3 Standard material. the purity is greater than or equal to 95%. Information about octamethylcyclotetrasiloxane (D4) and decamethylcyclopentasiloxane (D5) See Appendix A for information. 5.4 Standard stock solution, 1000μg/mL. accurately weigh an appropriate amount (accurate to 0.0001g) of octamethylcyclotetrasiloxane (D4) and ten The standard substance (5.3) of methylcyclopentasiloxane (D5) is placed in a volumetric flask, and the volume is fixed with n-hexane (5.2) and mixed. 5.5 Mixed standard working solution. Pipette appropriate amount of standard stock solution (5.4) into a volumetric flask, and dilute it step by step with n-hexane (5.2) to a mass The concentration is 0.5μg/mL, 1.0μg/mL, 5.0μg/mL, 20.0μg/mL, 50.0μg/mL, 100.0μg/mL mixed standard work Solution. 5.6 Organic filter membrane. pore size 0.22μm.

6 Equipment

6.1 Gas chromatograph. equipped with hydrogen flame ionization detector (FID). ......

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Tips & Frequently Asked Questions:

Question 1: How long will the true-PDF of GB/T 40955-2021_English be delivered?

Answer: Upon your order, we will start to translate GB/T 40955-2021_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 40955-2021_English with my colleagues?

Answer: Yes. The purchased PDF of GB/T 40955-2021_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. Our tax invoice, downloaded/delivered in 9 seconds, includes all tax/VAT and complies with 100+ countries' tax regulations (tax exempted in 100+ countries) -- See Avoidance of Double Taxation Agreements (DTAs): List of DTAs signed between Singapore and 100+ countries

Question 4: Do you accept my currency other than USD?

Answer: Yes. If you need your currency to be printed on the invoice, please write an email to Sales@ChineseStandard.net. In 2 working-hours, we will create a special link for you to pay in any currencies. Otherwise, follow the normal steps: Add to Cart -- Checkout -- Select your currency to pay.