Thermal analysis sampling technology is a widely used sampling technology, the main equipment of thermal sampling technology isthermal analyzer.

Application areas of thermal analyzer:

1. Occupational safety, industrial hygiene and environmental monitoring;

Rapid identification of unknown atmospheres;

3. Spice and flavor analysis;

4. Toxic substance accident assessment (when personnel can safely return to the accident site);

5. Environmental security monitoring around chemical weapons warehouses;

Quality control tests in the polymer and packaging industry;

7. Evaluation of drug solvents and product purity;

the principle of thermal analyzer:

According to the adsorption theory, the lower the temperature, the stronger the adsorption force between the adsorbent and the adsorbate, and the weaker the adsorption force between the adsorbent and the adsorbate as the temperature increases. Therefore, heating can desorb the component to be measured adsorbed on the adsorbent. The heating temperature, that is, the thermal desorption temperature, is related to the boiling point of the component to be measured and the thermal stability of the adsorbent. Low thermal desorption temperature may lead to incomplete desorption of components in the sample, low recovery rate and large residual amount in the tube; too high thermal desorption temperature may make some components unstable by heating, resulting in low recovery rate. In addition, some adsorbents have catalytic activity for certain substances, resulting in a decrease in their recovery.

The thermal desorption process is affected by the heating rate and temperature, so it is necessary to strictly control the heating rate and temperature in the thermal desorption process. The faster the heating rate, the higher the temperature, the faster the desorption rate, and the narrower the initial sample band into the chromatographic column. The temperature depends on the measured component and the thermal stability of the adsorbent, and is generally below 300°C, because most polymeric adsorbents start to decompose at 300°C.