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Status : Active
Standard Type : Main
Document No : ISO 23696-2:2023
Document Year : 2023
Pages : 8
Edition : 1
Section Volume : Physical, chemical and biochemical methods (ISO/TC 147/SC 2.)
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 small-scale 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 chromotropic colour reaction, depending on the typical operating procedure of the small-scale sealed tube used, see Clause 9.
NOTE 2 Laws, regulations or StandardDetails 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.