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If the BOD of a diluted sample in 1 : 100 ratio is 11 PPM in the beginning and 8 PPM at the end of 5 days, then the BOD of the sample is
  • a)
    300 PPM
  • b)
    950 PPM
  • c)
    137.5 PPM
  • d)
    73 PPM
Correct answer is option 'A'. Can you explain this answer?
Verified Answer
If the BOD of a diluted sample in 1 : 100 ratio is 11 PPM in the begin...
Standard BOD is determined at 5 days incubation at 20° C


BOD5 @ 20°C = (D.Oi - D.Of) × D.F
Where, D.Oi = Initial Dissolve Oxygen,
D.Of = Final Dissolve Oxygen,
D.F = Dilution factor
Calculations:
BOD = (11 - 8) × 100 = 300 PPM
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If the BOD of a diluted sample in 1 : 100 ratio is 11 PPM in the beginning and 8 PPM at the end of 5 days, then the BOD of the sample isa)300 PPMb)950 PPMc)137.5 PPMd)73 PPMCorrect answer is option 'A'. Can you explain this answer?
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