The standard applies to all types of water. Notes 1. Dis uptions due to a deviating pH of the analysis sample are remedied by possible neutralization of the water. 2. Ammonium oxidation is prevented by adding allylthiourea. 3. Spontaneous oxygen consumption is not determined. 4. Toxic and inhibitory substances can reduce consumption; under the conditions of the determination, algae cause increased oxygen consumption.
NEN 6634-1991 history
1991NEN 6634-1991 Water- Determination of biochemical oxygen demand after n days (BOD?) Dilution and seeding method