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

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

Status : Current, Draft for public comment   Published : January 2021

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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
StatusCurrent, Draft for public comment
Publication Date14 January 2021
Normative References(Required to achieve compliance to this standard)ISO/IEC 17025, ISO 20236, ISO 5667-3, ISO 5667-1, ISO 11905-1, ISO 8466-1, ISO 5667-10, ISO 3696, ISO 7870-2
Informative References(Provided for Information)No other standards are informatively referenced
International RelationshipsISO/DIS 23697-2
Draft Expiry Date09 March 2021
DescriptorsGround water, Working range, Laboratory testing, Water testing, Chemical analysis and testing, Ions, Chlorites, Determination of content, Interferences (chemical), Chlorides, Calibration, Chlorates, Water, Anions, Liquid chromatography, Dissolution, Swimming pools, Chromatography, Quantitative analysis, Specimen preparation, Statistical data, Potable water, Test equipment, Quality
ICS13.060.50
Title in FrenchTitre manque Partie 2: Titre manque
CommitteeEH/3/2
PublisherBSI
FormatA4
DeliveryYes
Pages14
File Size305 KB
NotesWarning: this draft is not current beyond its expiry date for comments.
Price£20.00


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