Prepash - 9 points to consider when performing a correct TGA moisture analysis?
A TGA (Thermogravimetric Analysis) moisture analysis is a technique used to measure the moisture content of a sample by monitoring the change in mass as the sample is heated. Here are some important points to consider when performing a TGA moisture analysis:
- Sample selection and preparation: Select the appropriate sample type that is representative of the material to be analyzed.
- Sample quantity: Weigh an accurate amount of sample before beginning the analysis. The sample weight may vary depending on the instrument's sensitivity and the desired level of detail.
- Temperature range: Determine the appropriate temperature range for the analysis based on the expected properties of the sample. Ensure that the temperature range is sufficient to measure the complete decomposition of moisture in the sample.
- Heating rate: Select the appropriate heating rate (also called ramping rate) to ensure that the analysis is performed within an acceptable time frame without compromising sample integrity.
- Atmosphere: Determine the appropriate atmosphere for the 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: Carefully analyze the resulting data and identify the temperature at which moisture loss occurs. This can manifest as a sharp drop in mass.
- Accuracy and precision: Ensure the measurements are accurate and precise. This may require repeating the analysis or using additional control samples.
- Reporting: Document the results, including the temperature at which moisture loss occurs and the calculated moisture content. This must be documented in accordance with the relevant standards or guidelines.
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