The BOD is the parameter for ...
Published by Gernot Kayser
The BOD is the parameter for the concentration of easily biodegradable organic compounds in the sample. It is expressed as the amount of oxygen that is consumed by aerobic microorganism to degrade these compounds.
It can be measured as total, which means no filtration or cetrifugation of the sample - or as disssolved proportion of the total amount, then you have to filtrate the sample before measuring.
The corresponding parameter for all (total) amount of organic (or oxidizable) compounds in the sample is the COD. In general the BOD is around 50% of the COD in case of pure domestic wastewater samples.