Ensuring Representative Water Test Results
Why is it important to refrigerate water samples on their way back to the laboratory?
Sample refrigeration during transportation is crucial to maintain the sample integrity and to ensure that the test results are representative (i.e. the results are the same as what they were when sampled). ISO 5667-3:2018 Water Quality Sampling, states that the laboratory receiving the samples for many of the tests "examine the chilled samples collected within four hours of collection if stored at room temperature, or within 24 hours if stored at 2– 5°C." It is therefore critical that your water samples are returned to the laboratory within the correct temperature band and timescale to ensure compliance with the guidelines, but why are these in place?