The temperature sensor used in the Swiss Wantong 859 Tiamo temperature titrator is based on semiconductor technology, with a response time of only 0.3 seconds and a resolution of 10~5K, which can quickly and accurately reflect.
Temperature titration is a very common measurement method and an ideal supplement to potentiometric titration. There are several tips worth collecting during the temperature titration process:
1. Mixing process
The response time of the temperature probe used for temperature titration is approximately 0.3 seconds. In temperature titration, the noise of the instrument mainly comes from the temperature gradient of the stirring titrant. To minimize the measurement noise of the instrument, the stirring speed should be increased as much as possible while ensuring that the titrant does not splash out. Sometimes the stirring speed may be appropriately reduced, such as when the thermal effect of titration is very small, or when the evaporation heat of the solvent affects the titration process.
2. Data density
The data density near the titration inflection point is crucial for determining the accuracy of the equivalence point. The droplet velocity of temperature titration remains constant, so it is not advisable to reduce the droplet velocity near the inflection point to increase data density, similar to equivalent titration. On the contrary, the temperature titration software sets the data sampling density before the titration starts and maintains it unchanged throughout the titration process.
3. Probe position
The position of the temperature probe and the titration head of the burette in the titration cup should be optimized. The position of the temperature probe in the titration cup should be upstream of the rotating flow formed by the stirring of the titration head. This relative position is conducive to the mixing and effective titration of the titrant and the analyte.
4. Software optimization titration results
The temperature titration software adopts a digital smoothing algorithm function with strong functionality and filter coefficient as the variable, which can minimize the drift of the equivalence point. Of course, drift is inevitable. For high precision, this drift should also be taken into account. For reactions with high enthalpy and fast reaction rates, the drift of their equivalence points is not significant. For example, oxidation reactions and strong acid/strong base reactions have extremely small equivalent point drift. And some reactions require more careful optimization.