Criteria to select BOD 5 values from series of dilution
On my BOD analysis I found that the 8x dilution and 16x dilution falls within the acceptable range; A-B> 2 and B/A>0.3 where A & B are the 1st and 5th day reading respectively. I obtained result of 39.04 mg/L and 57.28 mg /L respectively .
My question is can I average both the value as my final value or is there any other criteria. I also wish to find out the reason my BOD value increases with the dilution factor.
Kindly advice me.