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Headspace injection is an effective method for analyzing volatile components in liquid or solid samples headspace vials manufacturer. For example, the analysis of volatile VOC components in plastic packaging food packaging bags, analysis of the content of toxic components in body fluids after working in a toxic environment.
The headspace sampling device can be divided into three types: manual type, semi-automatic type and fully automatic type.
Manual type
It has a constant temperature furnace with several heating holes on it. It is equipped with a gas-tight glass syringe. The glass syringe has a thermal insulation sleeve. This device is characterized by cheap prices. The usual price should be in the thousands. However, the repeatability of the injection results is entirely dependent on the experience and level of the operator. In addition, the temperature range is not too high by the material of the glass syringe.
Semi-automatic
With a constant temperature furnace, the top empty bottles need to be manually placed one by one in the constant temperature furnace to balance. After the balance time is reached, there is a process of manually or manually inserting the sampling needle into the headspace bottle. The sampling and injection process is completely controlled by the machine's own sequence, and the sampling injection system can set the temperature to prevent the sample from condensing during transport.
After the headspace bottle is sealed, it should be manually placed on the conveyor belt or the turntable. The headspace bottle will enter the oven according to the user's programmed time sequence. After the constant temperature time, the robot automatically samples the system to automatically inject.
Pay attention to the following two points when selecting the headspace sampler:
First, the repeatability of the injection results, that is, the concentration of the RSD calibration sample is less than three thousandths. This indicator is a key indicator for the evaluation of the headspace sampler. The basic RSD of the qualified headspace sampler Zui should be less than 3% for this indicator, so the user should ask the manufacturer for the original spectrum and technical data.
Second, the temperature gradient is also a key indicator. The temperature control range and control accuracy of the headspace thermostat furnace (including the temperature stability and the deviation of the temperature gradient set value from the actual value) can be 180°C higher. Can do 200 ° C. Beyond 200 ° C is a bit far-fetched attributable to headspace injection. The temperature range is usually from 10 ° C to 150 ° C above room temperature headspace vials manufacturer.
This is the end of the introduction of How to choose the headspace sampler? I hope it can help you.
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