Reference number
ISO 23697-2:2023
© ISO 2024
International Standard
ISO 23697-2:2023
Water quality — Determination of total bound nitrogen (ST-TNb) in water using small-scale sealed tubes — Part 2: Chromotropic acid colour reaction
Edition 1
2023-02
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Опубликовано (Версия 1, 2023)

ISO 23697-2:2023

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CHF 63
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Тезис

This document specifies a method for the determination of total bound nitrogen (ST-TNb) in water of various origins: groundwater, surface water and wastewater, in a measuring range of concentration generally between 0,5 mg/l and 150 mg/l of ST-TNb 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.

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      The results of a small-scale sealed tube test are most precise in the middle of the application range of the test.

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 are applicable. Chromotropic colour reaction is applied, depending on the typical operating procedure of the small-scale sealed tube used, see Clause 9.

Общая информация

  • Текущий статус
     : Опубликовано
    Дата публикации
     : 2023-02
    Этап
    : Опубликование международного стандарта [60.60]
  • Версия
     : 1
  • Технический комитет :
    ISO/TC 147/SC 2
    ICS :
    13.060.50 
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  2. Интернет-магазин
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  5. 13
  6. 13.060
  7. 13.060.50
  8. ISO 23697-2:2023