Where should a sample be placed after a known volume is filtered for TDS analysis?

In TDS (Total Dissolved Solids) analysis, once a known volume of sample has been filtered, analyzing the sample immediately is crucial for obtaining accurate results. This is because TDS measurements can be affected by changes in the sample over time, such as evaporation or chemical reactions that may occur in the sample. Conducting the analysis right after filtration minimizes any potential alterations that could lead to discrepancies in the results.

While other options may appear relevant under certain circumstances, they do not align with the best practices for TDS analysis. For instance, placing the sample in cold storage or at room temperature for an extended period can lead to variations in solid concentrations, which would compromise the validity of the analysis. Consequently, prompt analysis ensures the integrity of the data collected from the sample.