What does improper sample preservation most likely lead to?

Improper sample preservation primarily leads to the degradation of sample quality. When samples are not preserved correctly, factors such as temperature fluctuations, exposure to light, or contamination can alter the chemical and biological constituents of the sample. For instance, certain microorganisms may grow or die off, chemicals may degrade or transform into other substances, and overall integrity can be compromised. This degradation negatively affects the reliability of the test results, making it difficult to ascertain the true composition of the wastewater sample at the time of collection. Maintaining the integrity of samples is essential to ensure that analytical results are accurate and representative of the actual condition of the wastewater being tested.