What should be done with the sample bottle immediately after collecting a water sample?

Labeling the sample bottle accurately immediately after collecting a water sample is crucial for several reasons. First, proper labeling ensures that all necessary information, such as the date, time, location of the sample, and any specific characteristics of the water being sampled, are clearly identified. This is vital for traceability and analysis, allowing anyone who handles the sample to understand its origin and the context in which it was collected.

Accurate labeling also helps prevent mix-ups with other samples, particularly in environments where multiple samples are being processed simultaneously. It ensures that the chain of custody is maintained and that the results obtained from the sample can be reliably traced back to the specific source, which is essential for any subsequent testing or regulatory compliance.

The other options would not support proper sample integrity. Leaving the bottle uncovered could lead to contamination from the environment. Storing it in direct sunlight could alter the characteristics of the water sample, affecting the test results. Filling it with additional water would dilute or adulterate the sample, compromising the integrity of the analysis. Therefore, accurate labeling is a fundamental step in the proper handling of water samples.