Sshould I shake CBOD sample to get the DO below 9mg/l?
Your final effluent DO seems pretty high. It is surprising that with 4 different sample you are getting the same results.
Have you did some quality check on your dilution water?
Tamie, dilution water is good ; usually below .10
I found that if the dilution water is above 9.0 then shake to get it below 9.0. The samples are what they are; the only thing that has to be done with them is to bring them to room temp. Thanks.