METHOD AND DEVICE FOR DETERMINING CHEMICAL OXYGEN REQUIREMENTS WITH THERMAL SAMPLE DECOMPOSITION

摘要

Method for determining the chemical oxygen demand, COD, of a water sample by thermal oxidation of the water sample in a closed reaction vessel in a carrier gas with a predetermined oxygen content and subsequent detection of the oxygen content in the exhaust gas of the reaction vessel and calculation of the COD value from the detected oxygen content, characterized in that the content of sulfates and / or nitrates in the water sample is detected by a respective dedicated detector and a computational correction of the COD value calculated on the basis of the oxygen content is carried out by means of a predetermined correction algorithm on the basis of the detected sulfate and / or nitrate content value.