NF EN ISO 20236, T90-236 (11/2024)

This document specifies a method for the determination of total organic carbon (TOC), dissolved organic carbon (DOC), total bound nitrogen (TNb) and dissolved bound nitrogen (DNb) in the form of free ammonia , ammonium, nitrites, nitrates and organic compounds which can be converted to nitrogen oxides under the conditions described. The procedure is carried out using instruments. NOTE Generally, this method can be applied to the determination of total carbon (TC) and total inorganic carbon (TIC), see Annex A. This method is applicable to water samples (e.g. water intended for human consumption , raw water, groundwater, surface water, seawater, wastewater, leachate). This method allows the determination of TOC and COD = 1 mg/l and TNb and DNb = 1 mg/l. The upper analysis domain is restricted by instrument conditions (e.g. injection volume). Higher concentrations can be measured after adequate sample dilution. For samples containing volatile organic compounds (e.g. industrial wastewater), the difference method is used, see Annex A. Cyanides, cyanates and elemental carbon particles (soot), if present in the sample sample, can be assayed with organic carbon. This method is not suitable for the determination of volatile or purgeable organic carbon under the conditions described by this method. Dissolved nitrogen gas (N2) is not measured.
(Automatic translation from French)