Thermal analyzer is a pre-treatment device used for the analysis of volatile organic compounds (VOCs) in samples, based on physical heating and adsorption techniques. The instrument captures VOCs in the sample through a glass tube filled with adsorbent, and then heats and desorbs them. The released compounds are introduced into a gas chromatograph with an inert carrier gas (such as nitrogen) for separation and detection.

The correct operation process of a thermal analyzer is crucial for ensuring the accuracy of experimental results and prolonging its lifespan. Let's learn about it together.

1、 Preparation work

1. Environmental inspection: Ensure good ventilation in the laboratory, keep away from sources of fire and flammable materials, as combustible gases may be generated during the thermal decomposition process.

2. Instrument inspection: Before starting up, carefully check whether all components are intact and undamaged, especially whether there are leaks or blockages in the injection port, heating module, and connecting pipelines.

3. Calibration confirmation: Perform calibration verification according to the manufacturer's guidelines to ensure that the temperature control accuracy meets the requirements. Adjust parameters as necessary to match the current experimental requirements.

2、 Sample preparation and loading

1. Sample preparation: Select a suitable sampling medium based on the properties of the analyte, such as adsorption tubes or filter membranes. After collecting samples, they should be sealed and stored as soon as possible, and analysis should be completed within the specified time to avoid loss.

2. Loading samples: Carefully insert the container containing the samples into the dedicated bracket, ensuring its accurate position and secure fixation. Avoid direct contact with the sample surface by hand to prevent contamination.

3、 Set parameters and start the program

1. Setting conditions: Input appropriate parameters such as heating rate, temperature, and holding time based on standard methods or literature data. Different types of compounds may require different desorption conditions to achieve the desired effect.

2. Start running: After confirming that all settings are correct, press the start button, and the system will automatically execute the preset program. During this period, closely monitor the real-time data changes on the display screen.

4、 Data analysis and recording

1. Data collection: As the temperature rises, the target compound is gradually released and enters the detector, and the trend of signal intensity should be continuously tracked. Modern instruments are usually equipped with accompanying software that can display and store the obtained information in real time.

2. Result interpretation: After the experiment, the collected data was processed and analyzed using professional software to generate a quantitative report. Pay attention to comparing the repeatability and consistency between batches in order to promptly detect any abnormal situations.

Following the above steps can effectively improve the operational efficiency of the thermal analyzer, while also ensuring the safety of experimental personnel. Good usage habits not only help to obtain high-quality research results, but also significantly extend the service life.