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

ISO 23697-1:2023

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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 220 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 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 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. Different digestion temperatures, 100 °C or 120 °C or 170 °C, and different digestion times are applicable. Dimethylphenol colour reactions are 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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  5. 13
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