What does the term 'hold time' refer to in water sample analysis?

The term 'hold time' in water sample analysis refers specifically to the maximum time that samples may be held before analysis. This concept is crucial because it ensures the integrity and accuracy of the sample results. Different contaminants can degrade over time, and certain physical, chemical, and biological properties of the water can change if the sample is not analyzed within a designated timeframe.

Each type of analyte may have specific hold times, which are determined based on how quickly they change after being collected. Adhering to these hold times is essential for compliance with regulatory standards and for producing reliable results that reflect the actual conditions of the water source at the time of sampling. This allows laboratories to provide valid data to water utilities and public health officials for monitoring and ensuring safe drinking water.