Principle of determination of benzyl alcohol in cosmetics by gas chromatography analysis：After extraction, the sample was separated by gas chromatography and detected by hydrogen flame ionization detector. Qualitative analysis was performed based on retention time, and quantitative analysis was performed using peak area. The content was calculated using standard curve method. The detection limit of this method is 0.0012 μ g, and the lower limit of quantification is 0.0039 μ g. If 1.0g of sample is taken, the detection concentration of benzyl alcohol by this method is 0.0012%, and the lowest quantitative concentration is 0.004%.
Instrument configuration, reagents and materials

Instrument configuration and reagents

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Gas chromatogram of benzyl alcohol standard solution

GC-2020 gas chromatographPerformance characteristics

1. Adopting320 x 240dot matrix5.7An inch large screen LCD Chinese display, real-time display of various temperatures and operating conditions, clear and intuitive content, truly realizing human-machine dialogue;
2Power on self-test, wide range self diagnostic function, can accurately determine the fault location and alarm;
3Six independent temperature controls (vaporization chamber and capillary vaporization chamber can be independently controlled), Five level program heating function;
4Overtemperature Protection function: If any circuit exceeds the set temperature, the instrument will automatically power off and sound an alarm;
5The vertical heating device of * makes sample vaporization more reliable, reduces the heat radiation generated in the vaporization chamber to the minimum, and ensures minimal temperature deviation inside the column box;
6Intelligent fuzzy control rear door opening system, automatically tracks temperature and dynamically adjusts The angle of the air door can achieve precise temperature control even near room temperature;
7Configure filling column head injection, glass lining injection, with diaphragm cleaning Functional capillary diversion/Non split injection device and capable of installing gas injectors;
8High precision dual stable gas path, capable of installing four types of detectors simultaneously;
9Optional electronic flow pressure display system with built-in workstation device.

Temperature control indicators
1.Temperature control range: room temperature 5℃～400℃ increment0.1℃
2.Temperature control accuracy: superior to±0.01℃

Program heating: Five step interval constant temperature time0～999minincrement0.1minTemperature increment0.1℃
Heating rate:200℃The biggest one below40℃/min 200℃Up to the biggest20℃/min