GB/T 40955-2021 Determination of octamethylcyclotetrasiloxane(D4) and decamethylcyclopentasiloxane(D5) in cosmetics—Gas chromatography (English Version)
Codeofchina.com is in charge of this English translation. In case of any doubt about the English translation, the Chinese original shall be considered authoritative.
This document is developed in accordance with the rules given in GB/T 1.1-2020 Directives for Standardization — Part 1: Rules for the Structure and Drafting of Standardizing Documents.
Attention is drawn to the possibility that some of the elements of this document may be the subject of patent rights. The issuing body of this document shall not be held responsible for identifying any or all such patent rights.
This document was proposed by and is under the jurisdiction of National Technical Committee 374 on Products Test Methods of Standardization Administration of China (SAC/TC 374).
Determination of Octamethylcyclotetrasiloxane (D4) and Decamethylcyclopentasiloxane (D5) in Cosmetics — Gas Chromatography
1 Scope
This document specifies the principle, reagents and materials, apparatus, procedures, calculation of results, recovery rate and precision, and tolerance for the determination of octamethylcyclotetrasiloxane (D4) and decamethylcyclopentasiloxane (D5) in cosmetics by gas chromatography.
This document is applicable to the determination of octamethylcyclotetrasiloxane (D4) and decamethylcyclopentasiloxane (D5) in aqueous solution, emulsion and cream (except waxy based cosmetics) in resident and rinsing cosmetics.
2 Normative References
No normative reference is listed in this document.
3 Terms and Definitions
No terms and definitions are listed in this document.
4 Principle
The sample can be dispersed by isopropanol and extracted by n-hexane, then determined by gas chromatograph for qualitative retention time and quantitative by external standard method, and confirmed by gas chromatography-mass spectrometry if necessary.
5 Reagents and Materials
Unless otherwise specified, only chromatographically pure reagents are used.
5.1 Isopropanol
5.2 n-Hexane.
5.3 Standard substance: purity ≥ 95%. Information on octmethylcyclotetrasiloxane (D4) and decamethylcyclopentasiloxane (D5) is given in Annex A.
5.4 Standard stock solution, 1000 μg/mL: take a proper amount of (to the nearest 0.0001 g) octmethylcyclotetrasiloxane (D4) and decamethylcyclopentasiloxane (D5) standard substance (5.3) in a volumetric flask, and mix with n-hexane (5.2) in constant volume.
5.5 Mixed standard working solution: a proper amount of standard stock solution (5.4) shall be transferred to a volumetric flask and diluted with n-hexane (5.2) step by step to a mixed standard working solution with mass concentrations of 0.5 μg/mL, 1.0 μg/mL, 5.0 μg/mL, 20.0 μg/mL, 50.0 μg/mL and 100.0 μg/mL.
5.6 Organic filter membrane: with a pore diameter of 0.22 μm.
Contents
Foreword II
1 Scope
2 Normative References
3 Terms and Definitions
4 Principle
5 Reagents and Materials
6 Apparatus
7 Procedures
8 Calculation of Results
9 Recovery Rate and Precision
10 Tolerance
Annex A (Informative) Information on Standard Substances
Annex B (Informative) Gas Chromatograms of Standard Substances Octmethylcyclotetrasiloxane (D4) and Decamethylcyclopentasiloxane (D5)
Annex C (Informative) Confirmatory Test
GB/T 40955-2021 Determination of octamethylcyclotetrasiloxane(D4) and decamethylcyclopentasiloxane(D5) in cosmetics—Gas chromatography (English Version)
Standard No.
GB/T 40955-2021
Status
valid
Language
English
File Format
PDF
Word Count
6500 words
Price(USD)
180.0
Implemented on
2022-6-1
Delivery
via email in 1 business day
Detail of GB/T 40955-2021
Standard No.
GB/T 40955-2021
English Name
Determination of octamethylcyclotetrasiloxane(D4) and decamethylcyclopentasiloxane(D5) in cosmetics—Gas chromatography
Codeofchina.com is in charge of this English translation. In case of any doubt about the English translation, the Chinese original shall be considered authoritative.
This document is developed in accordance with the rules given in GB/T 1.1-2020 Directives for Standardization — Part 1: Rules for the Structure and Drafting of Standardizing Documents.
Attention is drawn to the possibility that some of the elements of this document may be the subject of patent rights. The issuing body of this document shall not be held responsible for identifying any or all such patent rights.
This document was proposed by and is under the jurisdiction of National Technical Committee 374 on Products Test Methods of Standardization Administration of China (SAC/TC 374).
Determination of Octamethylcyclotetrasiloxane (D4) and Decamethylcyclopentasiloxane (D5) in Cosmetics — Gas Chromatography
1 Scope
This document specifies the principle, reagents and materials, apparatus, procedures, calculation of results, recovery rate and precision, and tolerance for the determination of octamethylcyclotetrasiloxane (D4) and decamethylcyclopentasiloxane (D5) in cosmetics by gas chromatography.
This document is applicable to the determination of octamethylcyclotetrasiloxane (D4) and decamethylcyclopentasiloxane (D5) in aqueous solution, emulsion and cream (except waxy based cosmetics) in resident and rinsing cosmetics.
2 Normative References
No normative reference is listed in this document.
3 Terms and Definitions
No terms and definitions are listed in this document.
4 Principle
The sample can be dispersed by isopropanol and extracted by n-hexane, then determined by gas chromatograph for qualitative retention time and quantitative by external standard method, and confirmed by gas chromatography-mass spectrometry if necessary.
5 Reagents and Materials
Unless otherwise specified, only chromatographically pure reagents are used.
5.1 Isopropanol
5.2 n-Hexane.
5.3 Standard substance: purity ≥ 95%. Information on octmethylcyclotetrasiloxane (D4) and decamethylcyclopentasiloxane (D5) is given in Annex A.
5.4 Standard stock solution, 1000 μg/mL: take a proper amount of (to the nearest 0.0001 g) octmethylcyclotetrasiloxane (D4) and decamethylcyclopentasiloxane (D5) standard substance (5.3) in a volumetric flask, and mix with n-hexane (5.2) in constant volume.
5.5 Mixed standard working solution: a proper amount of standard stock solution (5.4) shall be transferred to a volumetric flask and diluted with n-hexane (5.2) step by step to a mixed standard working solution with mass concentrations of 0.5 μg/mL, 1.0 μg/mL, 5.0 μg/mL, 20.0 μg/mL, 50.0 μg/mL and 100.0 μg/mL.
5.6 Organic filter membrane: with a pore diameter of 0.22 μm.
Contents of GB/T 40955-2021
Contents
Foreword II
1 Scope
2 Normative References
3 Terms and Definitions
4 Principle
5 Reagents and Materials
6 Apparatus
7 Procedures
8 Calculation of Results
9 Recovery Rate and Precision
10 Tolerance
Annex A (Informative) Information on Standard Substances
Annex B (Informative) Gas Chromatograms of Standard Substances Octmethylcyclotetrasiloxane (D4) and Decamethylcyclopentasiloxane (D5)
Annex C (Informative) Confirmatory Test