When should chlorine residual be analyzed after sample collection?

Chlorine residual should be analyzed immediately after sample collection to ensure the accuracy of the measurement. Chlorine is a highly reactive chemical, and its concentration can change quickly due to various factors, including the presence of organic matter, temperature fluctuations, and exposure to light. By analyzing the sample immediately, you can obtain a more reliable reading that reflects the true chlorine levels in the water at the time of sampling.

If chlorine residual is not analyzed right away, it may lead to fluctuations in readings that can misrepresent the water quality, affecting treatment processes and regulatory compliance. This immediacy is crucial in water quality monitoring to ensure safe drinking water standards are met consistently.