ISO 23697-2:2023

Тезис

This document specifies a method for the determination of total bound nitrogen (ST-TN_b) 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-TN_b 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
: Published

Дата публикации
: 2023-02
Версия
: 1
Технический комитет
: ISO/TC 147/SC 2 Physical, chemical and biochemical methods
ICS
:
13.060.50 Examination of water for chemical substances

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std 1 61	PDF + ePub
std 2 61	Бумажный

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Published

ISO 23697-2:2023
Этап: 60.60

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