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Specifies a method for the empirical and conventional determination of the biochemical oxygen demand of waters by dilution and seeding with suppression of nitrification. This standard is applicable to all waters having biochemical oxygen demands greater than or equal to 3 mg/l of oxygen demand and not exceeding 6000 mg/l of oxygen. For biochemical oxygen demands greater than 6000 mg of oxygen/l, the method is still applicable, but the errors caused by the necessary dilutions require the results to be interpreted with circumspection. The detection limit will depend on the laboratory. If results are reported with a lower detection limit, the laboratory needs to produce data to verify that detection limit. The results obtained are the product of a combination of biochemical and chemical actions. They do not have the rigorous and unambiguous character of those resulting from, for example, a single, well defined, chemical process. Nevertheless, they provide an indication from which the quality of waters can be estimated. The test can be influenced by the presence of various substances. Those which are toxic to microorganisms, for example bactericides, toxic metals or free chlorine, will inhibit biochemical oxidation. The presence of algae or nitrifying microorganisms can produce artificially high results.
|Nederlandse titel||Water - Bepaling van het biochemisch zuurstofverbruik na n dagen (BODn) - Deel 1: Verdunnings- en entmethode met toevoeging van allylthioreum|
|Engelse titel||Water analysis - Determination of biochemical oxygen demand after n days (BODn) - Part 1: Dilution and seeding method with allylthiouric addition|