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BOD Calculations

Please show how to calculate the BOD of a raw sewage sample given the following:
DO in blank after incubation = 8.3 mg/L
DO in dilution after incubation = 3.7 mg/L
DO in sample before dilution = 8.5 mg/L
Percent sample in dilution = 2.5%

Re: BOD Calculations

Initial DO, mg/L - DO After 5 days, mg/L
_________________________________________
Sample Volume, mL
______________________
BOD bottle Volume, ml

Assume initial DO = 8.5 mg/L
DO after 5 days = 3.7 mg/L
percent dilution = 2.5%
BOD bottle volume = 300 m/L
sample volume = 300 x .025 = 7.5 mL

then:

8.5 mg/L - 3.7 mg/L
____________________ =
0.025

4.8
______ = 192 mg/L
0.025