A100 ml sample of water was placed in a 300 ml bod bottle, and dilution water added to fill the bottle. the initial do concentration was 8.37 mg/l. the do reading after 5 days was 3.75 mg/l and after 9 days was 2.13 mg/l. determine a. bods b. bod9 (bod after 9 days incubation) c. the reaction constant, k, and d. bodu (a trial-and-error solution may be needed to determine k and bod) [hint: the typical range of values for k is 0.12-0.23 for treated sewage.] was