NBN ISO 23695:2023

< p class=" MsoBodyText" style=" mso-layout-grid-align: none text-autospace: none " > < span lang=" EN-GB" style=" mso-bidi-font-size: 12.0pt " > This document specifies a method for the determination of ammonium nitrogen (NH< sub> 4< / sub> -N) in drinking water, groundwater, surface water, wastewater, bathing water and mineral water using the small-scale sealed tube method. The result can be expressed as NH< sub> 4< / sub> or NH< sub> 4< / sub> -N or NH< sub> 3< / sub> or NH< sub> 3< / sub> -N.< / span>

< p class=" Note" style=" tab-stops: 19.85pt 39.7pt 48.25pt 59.55pt 79.4pt 99.25pt 119.05pt 138.9pt 158.75pt 178.6pt 7.0cm mso-layout-grid-align: none text-autospace: none " > < span lang=" EN-GB" style=" mso-bidi-font-size: 12.0pt " > NOTE 1< span style=" mso-tab-count: 1 " >    < / span> In the habitual language use of sewage treatment and on the displays of automated sealed-tube test photometers or spectrophotometers, NH< sub> 4< / sub> without indication of the positive charge has become the common notation for the parameter ammonium. This notation is adopted in this document even though not being quite correct chemical nomenclature.< / span>

< p class=" MsoBodyText" style=" mso-layout-grid-align: none text-autospace: none " > < span lang=" EN-GB" style=" mso-bidi-font-size: 12.0pt " > This method is applicable to (NH< sub> 4< / sub> -N) concentration ranges from 0,01 mg/ l to 1 800 mg/ l of NH< sub> 4< / sub> -N. The measuring ranges of concentration 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 method used, cannot be reported as accurate results. It is up to the user to choose the small-scale sealed tube test with the appropriate application range or to adapt samples with concentrations exceeding the measuring range of a test by preliminary dilution.< / span>

< p class=" Note" style=" tab-stops: 19.85pt 39.7pt 48.25pt 59.55pt 79.4pt 99.25pt 119.05pt 138.9pt 158.75pt 178.6pt 7.0cm mso-layout-grid-align: none text-autospace: none " > < span lang=" EN-GB" style=" mso-bidi-font-size: 12.0pt " > NOTE 2< span style=" mso-tab-count: 1 " >    < / span> The results of a small-scale sealed tube are most precise in the middle of the application range of the test.< / span>

< p class=" MsoBodyText" style=" mso-layout-grid-align: none text-autospace: none " > < span lang=" EN-GB" style=" mso-bidi-font-size: 12.0pt " > All manufacturers' methods are based on the Berthelot reaction and its modifications to develop indophenol blue colour. Reagents mixtures can differ slightly based on manufacturers small-scale sealed tube method, see < span class=" citesec" > < span style=" color: black mso-color-alt: windowtext border: none " > < span style=" border: none " > Clause 9< / span> < / span> < / span> . This method is applicable to non-preserved samples by using small-scale sealed tubes for the determination of drinking water, groundwater, surface water, wastewater and to preserved samples. The method is applicable to samples with suspended materials if these materials are removable by filtration.< / span>