Which characteristic is NOT typically used in indicating sample integrity?

Sample integrity is crucial in wastewater analysis to ensure that the collected samples accurately represent the conditions of the source. The characteristics that are typically used to indicate sample integrity include elements that directly relate to how and when the sample was collected.

The location of collection helps verify that the sample is taken from the correct site, which is essential for comparing results to regulatory standards or historical data. The date of collection is important for understanding when the sample was taken, which can affect the interpretation of results due to factors like seasonal variations or operational changes in the wastewater system. The initials of the collector serve as documentation of who collected the sample, adding a layer of accountability and traceability to the process.

In contrast, sample color does not provide reliable information about the integrity of the sampling process. While color may indicate certain characteristics of a sample, such as the presence of solids or other compounds, it does not inherently reflect whether the sample was collected under proper procedures or conditions. Therefore, it is not typically used as a criterion for ensuring integrity in the context of sampling.