ISO 20236:2018 水质 高温催化氧化燃烧后总有机碳（TOC）、溶解有机碳（DOC）、总结合氮（TN_b）和溶解结合氮（DN_b）的测定

标准编号：ISO 20236:2018

中文名称：水质 高温催化氧化燃烧后总有机碳（TOC）、溶解有机碳（DOC）、总结合氮（TN_b）和溶解结合氮（DN_b）的测定

英文名称：Water quality — Determination of total organic carbon (TOC), dissolved organic carbon (DOC), total bound nitrogen (TNb) and dissolved bound nitrogen (DNb) after high temperature catalytic oxidative co

发布日期：2018-09

标准范围

This document specifies a method for the determination of total organic carbon (TOC), dissolved 
organic carbon (DOC), total bound nitrogen (TN_b) and dissolved bound nitrogen (DN_b) in the form of 
free ammonia, ammonium, nitrite, nitrate and organic compounds capable of conversion to nitrogen 
oxides under the conditions described. The procedure is carried out instrumentally.
NOTE Generally the method can be applied for the determination of total carbon (TC) and total inorganic 
carbon (TIC), see Annex A.
The method is applicable to water samples (e.g. drinking water, raw water, ground water, surface water, 
sea water, waste water, leachates).
The method allows a determination of TOC and DOC ≥ 1 mg/l and TN_b and DN_b ≥ 1 mg/l. The upper 
working range is restricted by instrument-dependent conditions (e.g. injection volume). Higher 
concentrations can be determined after appropriate dilution of the sample.
For samples containing volatile organic compounds (e.g. industrial waste water), the difference method 
is used, see Annex A.
Cyanide, cyanate and particles of elemental carbon (soot), when present in the sample, can be 
determined together with the organic carbon.
The method is not appropriate for the determination of volatile, or purgeable, organic carbon under the 
conditions described by this method.
Dissolved nitrogen gas (N₂ ) is not determined.
 

标准预览图