Theoretical oxygen demand
The theoretical oxygen demand (ThOD; English Theoretical Oxygen Demand, ThOD) is an operand for the degradability of substances. It is used to assess the pollution of wastewater .
The value is calculated for a single substance and indicates the total amount of oxygen that is required for its complete oxidation . It corresponds to the chemical oxygen demand (COD), provided it is not a substance that is chemically difficult to oxidize (e.g. a simple hydrocarbon ). The end products of the oxidation assumed in the calculation of the ThOD (for nitrogen e.g. nitrate ) should actually be achievable with the method for determining the COD so that the values can be compared.
The unit of the theoretical oxygen demand is g oxygen per g test substance. For water samples, the oxygen demand is usually given in mg / l .
Individual evidence
- ↑ Cefic - European Chemical Industry Council: Guidance on relationships between common acronyms related to effluent water: BOD, COD, ThOD, StOD, TOD, TOC, and DOC ( Memento of June 9, 2007 in the Internet Archive ). 1998