STA PT 1600 HS – calcium oxalate – high speed inductive STA
Calcium oxalate – Thermal decomposition – inorganics – fast decomposition
The new High-Speed STA, a combination of a classic STA PT 1600 and an additional inductive furnace for high speed TG-measurements can provide standard STA measurements (TG combined with simultaneous DSC or DTA) as well as TG measurements with very fast heating and cooling rates.
The whole analysis of a sample can be done within a few minutes (including the cooling), giving the same result as with standard analysis what will take up to 4 hours. This gives you a big advantage if high numbers of samples are required to be measured in short time, for instance in quality control or process monitoring.
The curves above show a Calcium oxalate standard. There are three mass loss steps on the green and red curves (relative and absolute delta m), where the first one is the removal of H2O, the second one is the loss of CO and the third step is the loss of CO2. The resulting Calcium oxide (CaO) is reacting afterwards with the water from the first step, that is still in the reaction chamber if the atmosphere is static. It shows the formation of Calcium hydroxide (Ca(OH)2) that is formed at around 580°C during cooling.
This last step is hard to see on a standard STA or TG because of the slow cooling rates. But in this case, a whole measurement cycle can be done within just 20 minutes. In this example the heating and cooling rate was 2K/s, but you can easily go up to 100K/s using inductive STA.