Hach BODTrak II User Manual page 31

4. When samples are seeded, calculate the results using this equation and the
corrected results:
Where:
A = corrected BOD of the seeded sample
B = corrected BOD of the seed blank
SA = volume of seed in sample (sample can also be GGA)
SB = volume of seed in seed blank
Example:
A= 290 mg/L BOD
B= 120 mg/L BOD
SA= 20 mL
SB= 110 mL
BOD mg/L
BOD mg/L = 268 mg/L
( )
BOD mg/L
=
( )
= 290mg/L
BODTrak™ II procedures
SA
⎛ ⎞
------- -
A B x
–
⎝ ⎠
SB
20mL
⎛
------------------ -
– 120mg/L x
⎝
110mL
⎞
⎠
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