Correct TGA moisture analysis? 9 points to watch out for.
Prepash- 9 points to consider when performing a proper TGA moisture analysis?
A TGA (Thermogravimetric Analysis) for moisture analysis is a technique used to measure the moisture content in a sample by tracking the change in mass as the sample is heated. Here are some important points to watch out for when performing a TGA moisture analysis:
- Sample selection and preparation: Choose the appropriate type of sample representative of the material to be analyzed.
- Sample Quantity: Weigh an accurate amount of the sample before starting the analysis. The sample weight may vary depending on the sensitivity of the instrument and the level of detail desired.
- Temperature range: Determine the appropriate temperature range for analysis based on the expected characteristics of the sample. Ensure that the temperature range is sufficient to measure the complete decomposition of moisture in the sample.
- Heating rate: Choose the appropriate heating rate (also called ramping rate) to ensure that the analysis is performed within an acceptable time frame without compromising the integrity of the sample.
- Atmosphere: Determine the appropriate atmosphere for analysis, such as inert gases (e.g., nitrogen) to prevent oxidation of the sample.
- Repeatability: Perform the analysis multiple times to ensure repeatability of the results.
- Data Interpretation: Analyze the resulting data carefully and identify the temperature at which moisture loss occurs. It may manifest as a sharp drop in mass.
- Accuracy and precision: Make sure the measurements are accurate and precise. This may require you to repeat the analysis or use additional control samples.
- Reporting: Document the results, including the temperature at which moisture loss occurs and the calculated moisture content. This should be documented according to relevant standards or guidelines.
