How do I compare my dilution method results with those obtained from the BODTrak II?
Results comparable to the dilution method can be achieved with the BODTrak II in only two to three days. Determine the BOD of your sample using the 5-day dilution method. Then, follow the appropriate procedure in the BODTrak II manual for your sample and incubate for 5 days. Results are graphed over time and remain on the large graphic display throughout the duration of the test. Determine the amount of incubation time that it took to achieve the same result obtained from the dilution method. A seed correction must be applied for seeded samples. Lets say, for example, that this result was achieved in 2.45 days. For future test samples, the results shown on the BODTrak II after 2.45 days of incubation will be comparable to the 5-day dilution method. Ideally, you would want to determine this correlation for each type of sample tested (influent, effluent, GGA, e.g.).
