GB/T 35894-2018 PDF English
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| Standard ID | Contents [version] | USD | STEP2 | [PDF] delivery | Name of Chinese Standard | Status |
| GB/T 35894-2018 | English | 125 |
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Determination of 10 Forbidden Glycol Ethers and Esters in Cosmetics - GC-MS
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GB/T 35894-2018: Determination of 10 Forbidden Glycol Ethers and Esters in Cosmetics - GC-MS---This is an excerpt. Full copy of true-PDF in English version (including equations, symbols, images, flow-chart, tables, and figures etc.), auto-downloaded/delivered in 9 seconds, can be purchased online: https://www.ChineseStandard.net/PDF.aspx/GBT35894-2018
GB
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 71.100.70
Y 42
Determination of 10 Forbidden Glycol
Ethers and Esters in Cosmetics - GC-MS
Issued on: FEBRUARY 6, 2018
Implemented on: SEPTEMBER 1, 2018
Issued by. General Administration of Quality Supervision, Inspection and
Quarantine;
Standardization Administration of the People’s Republic of
China.
Table of Contents
Foreword ... 3
Introduction ... 4
1 Scope ... 5
2 Principle ... 5
3 Reagents and Materials ... 5
4 Reagents and Materials ... 6
5 Analytical Procedures ... 6
6 Result Calculation ... 8
7 Recovery Rate and Precision ... 9
8 Allowable Deviation ... 9
Appendix A (Informative) Detection Limit and Quantitation Limit of This Method
... 10
Appendix B (Informative) Chinese Name, English Name, CAS No., Molecular
Formula, Relative Molecular Mass and Chemical Structural Formula of 10
Forbidden Glycol Ethers and Esters ... 11
Appendix C (Informative) Quantitative and Qualitative Selected Ion Parameters
of 10 Forbidden Glycol Ethers and Esters ... 12
Appendix D (Informative) Gas Chromatography-Mass Spectrometry Selected
Ion Chromatogram of Standard Substances of 10 Forbidden Glycol Ethers and
Esters ... 13
Determination of 10 Forbidden Glycol
Ethers and Esters in Cosmetics - GC-MS
1 Scope
This Standard specifies reagents and materials, instruments and equipment, analytical
procedures, result calculation, recovery rate and precision, and allowable deviation of
gas chromatography-mass spectrometry method of determining 10 forbidden glycol
ethers (ethylene glycol dimethyl ether, 2-methoxy ethanol, 2-methoxy propanol, 2-
ethoxyethanol, 2-methoxy propyl acetate, 2-methoxyethyl acetate, 2-ethoxy ethyl
acetate, dimethoxy diglycol, 2-(2-methoxye-thoxy) ethanol, triethylene glycol dimethyl
ether) and their ester compounds in cosmetics.
This Standard is applicable to the determination of the content of 10 forbidden glycol
ethers and their ester compounds in cosmetics.
Please refer to Table A.1 in Appendix A for the detection limit and quantitation limit of
the method in this Standard.
2 Principle
Sample goes through ultrasonic extraction with ethyl acetate-methanol mixed solvent.
Adopt gas chromatograph-mass spectrometer for determination; quantify through the
external standard method.
3 Reagents and Materials
Unless it is otherwise indicated, all reagents being adopted shall be analytical pure.
3.1 Ethyl acetate. chromatographic purity.
3.2 Methanol. chromatographic purity.
3.3 Anhydrous sodium sulfate.
3.4 20% ethyl acetate methanol solution (V/V, volume ratio). measure-take 200 mL of
ethyl acetate (3.1), then, mix it up with 800 mL of methanol (3.2).
3.5 Standard samples/substances of 10 forbidden glycol ethers and esters. purity shall
be not less than 98%. Please refer to Table B.1 in Appendix B for the Chinese name,
English name, CAS No., molecular formula, relative molecular mass and chemical
same as the procedures of non-waxy based sample treatment.
5.2 Determination
Since the determination result depends on the instrument being adopted, it is
impossible to provide general parameters of gas chromatography-mass spectrometry
analysis. The set parameters shall guarantee that the tested components and the other
components can be effectively separated in chromatographic determination. The
reference conditions of gas chromatography-mass spectrometry are as follows.
a) Chromatographic column. VF-WAX column, 60 m x 0.25 mm (i.d.) x 0.25 μm,
or other equivalents;
b) Inlet temperature. 220 °C;
c) Transmission line temperature. 280 °C;
d) Inlet mode. split injection, split ratio. 5.1;
e) Carrier gas. helium, purity ≥ 99.999%; mode of control. constant flow; flow rate.
1.0 mL/min;
f) Column temperature. initial temperature. 50 °C, maintain for 7 min; rise to 140 °C
at 5 °C/min, maintain for 1 min; rise to 240 °C at 20 °C/min, maintain for 2 min.
Post-treatment temperature. 245 °C, duration. 3 min.
g) Inlet volume. 1 μL.
h) Ionization source. EI source;
i) Ionization energy. 70 eV;
j) Quadrupole temperature. 150 °C;
k) Ionization source temperature. 230 °C;
l) Solvent delay time. 7.8 min;
m) Mode of monitoring. select ion scanning mode (SIM); please refer to Table C.1
in Appendix C for monitoring ions.
5.3 Blank Test
Other than sample-weighing, comply with procedure 5.1 and procedure 5.2.
5.4 Qualitative Confirmation
Under the instrument conditions in 5.2, the selected ion chromatographic peak of the
tested sample and the standard solution emerges in the same retention time, and the
V---the constant volume of the sample, expressed in (mL);
m---the sample mass represented by the ultimate test solution, expressed in (g).
The calculation result shall retain 3 significant figures.
7 Recovery Rate and Precision
Non-waxy based sample shall be within the fortified concentration range of 2.0 mg/kg
~ 30 mg/kg; within the recovery rate of 80% ~ 110%; its relative standard deviation
shall be less than 10%.
Waxy-based sample shall be within the fortified concentration range of 3.0 mg/kg ~
60 mg/kg; within the recovery rate of 80% ~ 110%; its relative standard deviation
shall be less than 10%.
8 Allowable Deviation
The absolute difference of two independent determination results obtained under
repeatability conditions shall not exceed 10% of the arithmetic mean value.
......
Source: Above contents are excerpted from the full-copy PDF -- translated/reviewed by: www.ChineseStandard.net / Wayne Zheng et al.
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