Why is it important to keep samples cool after collection?

Keeping samples cool after collection is crucial because temperature directly affects the biochemical processes and physical state of the sample. When samples are stored at higher temperatures, metabolic activities can continue, potentially altering the composition of the sample. By cooling the samples, you slow down these processes and help preserve the integrity of the samples over time, ensuring that they accurately represent the conditions at the time of collection.

This preservation is particularly important for accurate analysis, as any changes occurring due to warm storage can lead to incorrect conclusions about the sample's characteristics or pollutants. Maintaining cool temperatures helps ensure the reliability and validity of test results.