In BOD analysis, distilled water should not exceed how many mg/L oxygen depletion?

In Biological Oxygen Demand (BOD) analysis, it is important to ensure that the distilled water used in the test contributes minimally to the overall oxygen depletion measurement. This is crucial because the goal of the test is to accurately determine the oxygen demand of the wastewater being analyzed, without interference from other sources.

The acceptable limit for oxygen depletion in distilled water during BOD analysis is 0.2 mg/L. If it were higher than this level, it could skew the test results, leading to an inaccurate representation of the organic matter present in the sample. Thus, maintaining the oxygen depletion of distilled water at or below this limit ensures that any observed oxygen depletion in the wastewater sample is a true reflection of its BOD, rather than an artifact of the water used in the testing process. By adhering to this standard, analysts can produce reliable and valid results that are essential for evaluating the wastewater's impact on the environment.