BOD Biochemical oxygen demand
COD Chemical oxygen demand
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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