What is a common practice for preserving the integrity of a water sample before delivery?

Refrigerating the water sample if delivery is delayed is a crucial practice for preserving its integrity. The temperature at which a water sample is stored can significantly affect the viability of microorganisms and the stability of certain chemical constituents. Cooler temperatures can help minimize biological activity and limit the breakdown of certain compounds, ensuring that the sample accurately reflects the conditions of the water source at the time of collection.

Storing water samples at room temperature, exposing them to direct sunlight, or mixing them vigorously before delivery can negatively impact the sample. Room temperature and sunlight can promote the growth of bacteria and algae, leading to changes in concentration levels. Vigorous mixing can introduce air and potentially alter the chemical composition or introduce contaminants. Therefore, refrigeration is the best method to maintain the sample's original conditions for accurate analysis.