BSI 21/30426878 DC:2021 Edition

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BS ISO 23697-2. Water quality. Determination of total nitrogen (TNb) in water using small-scale sealed tubes – Part 2. Chromotropic acid based method

Published By	Publication Date	Number of Pages
BSI	2021	14

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Categories: 13.060.50 - Examination of water for chemical substances, BSI

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Description

This document specifies a method for the determination of total nitrogen (TN_b) 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 TN_b 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 TN_b is often reported by International Standards and represents “total bound nitrogen”.

Additional information

Status	Definitive
Pages	14
Publication Date	2021-01-14
Standard Number	21/30426878 DC
Title	BS ISO 23697-2. Water quality. Determination of total nitrogen (TNb) in water using small-scale sealed tubes – Part 2. Chromotropic acid based method
Identical National Standard Of	ISO/DIS 23697-2
Descriptors	Chlorites, 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)
Publisher	BSI
Committee	EH/3/2
ICS Codes	13.060.50 - Examination of water for chemical substances

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BSI 21/30426878 DC:2021 Edition

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