What information must be recorded for each sample collected?

The most comprehensive information that must be recorded for each sample collected includes field observations, the time the sample was collected, and the individual who collected the sample. This data is crucial for several reasons:

1. Field Observations: This information provides context regarding the conditions at the time of sampling. Observations can include factors such as water appearance, odor, and the presence of biological activity, which can all influence the interpretation of the results.

2. Time of Collection: Timing is important as environmental conditions can change rapidly, affecting the sample's characteristics. Knowing the exact time allows for better comparison with other data or regulatory requirements since some parameters can fluctuate with time of day or weather changes.

3. Collector Identification: Recording who collected the sample is essential for accountability and traceability. It allows for follow-up if questions arise regarding the sample handling or if further investigation is necessary.

While the other options include some relevant information, they do not encompass all the critical details required to ensure the integrity and veracity of the sampling process. For instance, details about the sample's pollutant type or environmental conditions such as temperature and weather may be useful, but they do not provide a complete picture without the context of the observations and the time of