GB/T 35953-2018 in English
VALIDDetermination of restricted dichloromethane and 1,1,1-trichloroethane in cosmetics—Headspace gas chromatography
- Issued on:2018-02-06
- Implemented on:2018-09-01
- File Format:PDF
- Delivery:Via email within 1~3 business days
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《GB/T 35953-2018化妆品中限用物质二氯甲烷和1,1,1-三氯乙烷的测定 顶空气相色谱法》由TC257（全国香料香精化妆品标准化技术委员会）归口，TC257SC2（全国香料香精化妆品标准化技术委员会化妆品分会）执行，主管部门为中国轻工业联合会。
Introduction
1. Scope and applicability of the standard
This standard is applicable to the determination of dichloromethane and 1,1,1-trichloroethane in creams, lotions and water-based cosmetics.
| Compound Name | Detection Limit(mg/kg) | Quantification Limit(mg/kg) | Analysis Method |
|---|---|---|---|
| Dichloromethane | 0.070 mg/kg | 0.25 mg/kg | Gas Chromatography |
| 1,1,1-Trichloroethane | 0.0010 mg/kg | 0.005 0 mg/kg | Gas Chromatography |
2. Background of Standard Formulation and Analysis of Technology Evolution
With the development of the cosmetics industry, the safety of restricted substances has received increasing attention. Dichloromethane and 1,1,1-trichloroethane are potentially harmful substances, and their residual amounts in cosmetics must be strictly controlled. This standard is based on Gas Chromatography (GC) combined with an Electron Capture Detector (ECD), ensuring high sensitivity and accuracy of the measurement results.
3. Experimental Principles and Methods
3.1 Principle
The sample is placed in a sealed headspace injection bottle. Under a certain temperature and time balance, the target compound reaches a dynamic equilibrium in the gas-liquid phase. By measuring the concentration in the gas phase and combining it with the sample mass, the specific content in the sample is calculated.
3.2 Reagents and Instruments
Gas Chromatograph: Equipped with Electron Capture Detector (ECD)
Headspace Sampler: 20 mL Headspace Sampler Bottle
Analytical Balance: Sensitivity of 0.01 g and 0.1 mg
Volume Flasks: 10 mL, 50 mL and 100 mL
4. Implementation Suggestions
- Strictly follow the standard operating procedures for sample pretreatment to ensure weighing accuracy.
- Regularly calibrate the instruments, especially the sensitivity of the gas chromatograph and electron capture detector.
- Establish a quality control system, including blank test and recovery verification, to ensure data reliability.
- For high-risk products (such as cosmetics containing volatile ingredients), it is recommended to increase the frequency of testing.
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