Symbols

BOD Biochemical oxygen demand

COD Chemical oxygen demand

D Fractional dilution of the BOD sample

F Final DO of the same sample which has been diluted with seeded dilution water after the incubation period F Final DO of the blank after incubating at the same time and tem perature as the sample I Initial DO of the sample which has been diluted with seeded dilution water

I' The initial DO of a volume Y of the blank composed of only the seeded dilution water Lc CBOD of sample

R Residual; hydrocarbon group

R(-OH General formula are called organic acids O

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