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  • BSI
    21/30426878 DC BS ISO 23697-2. Water quality. Determination of total nitrogen (TNb) in water using small-scale sealed tubes - Part 2. Chromotropic acid based method
    Edition: 2021
    $42.22
    / user per year

Description of 21/30426878 DC 2021

This document specifies a method for the determination of total nitrogen (TNb) in water of various origins: natural water and wastewater, in a measuring range of concentration generally between 0,5 mg/l and 220 mg/l of TNb using the small‑scale sealed tube method. Different measuring ranges of small‑scale sealed tube methods can be required.

The measuring ranges can vary depending on the type of small‑scale sealed tube method of different manufacturers. Concentrations even slightly higher than the upper limit indicated in the manufacturers manual relating to the small-scale sealed tube methods used, cannot be reported as accurate results. Appropriate preliminary dilution of the sample shall be performed or a small‑scale sealed tube method with a different application measuring range shall be used.

All small‑scale sealed tube methods are based on a heated alkaline potassium persulfate oxidation in a heating block at 100 °C and different digestion times maybe be applicable. Chromotropic colour reaction is applied, depending on the typical operating procedure of the small‑scale sealed tube used, see Clause 8.

NOTE

The notation TNb is often reported by International Standards and represents "total bound nitrogen".



Standard Number21/30426878 DC
TitleBS ISO 23697-2. Water quality. Determination of total nitrogen (TNb) in water using small-scale sealed tubes - Part 2. Chromotropic acid based method
StatusDefinitive
Publication Date2021-01-14
Identical National Standard OfISO/DIS 23697-2
DescriptorsChlorites, Quality, Ions, Specimen preparation, Interferences (chemical), Water, Working range, Chlorides, Statistical data, Anions, Liquid chromatography, Calibration, Determination of content, Potable water, Water testing, Test equipment, Ground water, Chemical analysis and testing, Swimming pools, Chlorates, Dissolution, Chromatography, Quantitative analysis, Laboratory testing, Chromotropic acid, Watering, Tubes (pipes), Water supply, Group Ia inorganic compounds, Nitric acid, Nitrous oxide, Organic nitrogen compounds (aliphatic)
ICS13.060.50 Examination of water for chemical substances
CommitteeEH/3/2
PublisherBSI
Pages14

About BSI

BSI Group, also known as the British Standards Institution is the national standards body of the United Kingdom. BSI produces technical standards on a wide range of products and services and also supplies certification and standards-related services to businesses.
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