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Water quality - Determination of nitrate in water using small-scale sealed tubes - Part 1: Dimethylphenol colour reaction
This document specifies a method for the determination of **nitrate as NO3-N** in water of various origin such 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 NO3-N 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.
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.
NOTE 1: The results of a sealed-tube test are most precise in the middle of the application range of the test.
Manufacturers' small-scale sealed tube methods are based on **dimethylphenol colour reaction** depending on the typical operating procedure of the small-scale sealed tube used, see Clause 9.
NOTE 2: Laws, regulations or standards can require that the data is expressed as NO3- after conversion with the stoichiometric conversion factor 4,426 81 in Clause 11.
NOTE 3: In the habitual language, use of sewage treatment and on the displays of automated sealed-tube test devices, NO3 without indication of the negative charge has become the common notation for the parameter nitrate and especially for the parameter nitrate-N. This notation is adopted in this document even though not being quite correct chemical nomenclature.
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