During sample transport, what must be prioritized to maintain sample integrity?

Maintaining the integrity of water samples during transport is crucial for accurate testing and analysis. Preserving samples in cool and dark conditions helps to prevent the growth of microorganisms and chemical reactions that could alter the sample composition. Elevated temperatures can promote biological activity, potentially leading to changes in the concentration of certain analytes, while exposure to light can result in photodegradation of sensitive compounds.

By keeping samples cool and in a dark environment, the original state of the sample is better maintained, ensuring that the data obtained from subsequent testing is a true reflection of the water's characteristics. This practice aligns with standard protocols in environmental sampling, where controlling temperature and light exposure is essential for reliable results.