In the ecoinvent inventories, all four sum parameters, BOD5,
COD, DOC and TOC, are recorded in parallel (i.e. without
any reductions due to separately reported individual substances).
4 If necessary (no sum parameter measurements available)
they are calculated from the information given for
individual water pollutants. For that purpose, the stoichiometric
oxygen demand for the oxidation is calculated as an
assessment for COD and BOD5, respectively. The amount
of TOC and DOC is determined from the carbon content of
the individual substance and based on the recommendations
of de Beaufort-Langeveld et al. (2003).