In BOD5 determination of sewage, the initial dissolved oxygen is measured to be 8.3 mg/l. However, after 5-days incubation at 20°C temperature, the dissolved oxygen is found to be 2.3 mg/l. If the dilution factor is 1:60, the BOD5 of the sewage would be

In BOD5 determination of sewage, the initial dissolved oxygen is measu

1.	In BOD5 determination of sewage, the initial dissolved oxygen is measured to be 8.3 mg/l. However, after 5-days incubation at 20°C temperature, the dissolved oxygen is found to be 2.3 mg/l. If the dilution factor is 1:60, the BOD5 of the sewage would be
A.	360 mg/l
B.	260 mg/l
C.	Cannot be determined
D.	6.0 mg/l
Answer» B. 260 mg/l