According to regulatory standards, what is the maximum storage time for properly preserved BOD samples?

The maximum storage time for properly preserved Biochemical Oxygen Demand (BOD) samples is 48 hours according to regulatory standards. This standard is in place because BOD measurements are sensitive to the changes in the concentration of the sample over time. Extended storage can lead to alterations in biological activity, resulting in either an increase or decrease in the BOD readings.

Preserving samples appropriately helps maintain their integrity until testing can occur. While shorter storage times may maintain sample quality better, preserving for up to 48 hours allows for some logistical flexibility in sample collection and analysis while still ensuring accurate and reliable results. Beyond this timeframe, the risk of microbial degradation or consumption of the organic material, which is measured by BOD, increases significantly, potentially leading to unreliable results.