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Numerical based on BOD and COD : 50 ml of water sample contains 840 ppm of dissolved oxygen
written 5.5 years ago by gravatar for teamques10 teamques10 ★ 64k •   modified 4.0 years ago

50 ml of water sample contains 840 ppm of dissolved oxygen .After 5 days the dissolved oxygen value becomes 230 ppm after the sample has been diluted to 80 ml calculate BOD of sample.
engineering chemistry
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written 5.5 years ago by gravatar for teamques10 teamques10 ★ 64k

BOD =DO1 – DO2 X ml of sample after dilution / ml of sample before dilution

BOD =840 – 230 X 80/ 50

BOD = 976 ppm
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