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  • BSI
    21/30426872 DC BS ISO 23696-2. Water quality. Determination of nitrate in water using small-scale sealed tubes - Part 2. Chromotropic acid based method
    Edition: 2021
    $44.66
    / user per year

Description of 21/30426872 DC 2021

This document specifies a method for the determination of nitrate as NO3-N in water of various origin as natural water (including groundwater, surface water and bathing water), drinking water and wastewater, in a measuring range of concentration between 0,10 mg/l and 225 mg/l of N-N03 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 the 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 method 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.

Manufacturers' small-scale sealed tube methods are based on chromotropic colour reaction, depending on the typical operating procedure of the small‑scale sealed tube used , see Clause 8.

If required by laws, regulamentations or standards, the data can be expressed as NO3 after conversion with the stoichiometric conversion factor 4,426 81, see Clause 10.



Standard Number21/30426872 DC
TitleBS ISO 23696-2. Water quality. Determination of nitrate in water using small-scale sealed tubes - Part 2. Chromotropic acid based method
StatusDefinitive
Publication Date2021-01-11
Identical National Standard OfISO/DIS 23696-2
DescriptorsPotable water, Preservation, Water, Water testing, Containers, Chemical analysis and testing, Biological analysis and testing, Quality, Samples, Test specimens, Laboratory testing, Water treatment, Chromotropic acid
ICS13.060.50 Examination of water for chemical substances
CommitteeEH/3/2
PublisherBSI
Pages13

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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