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
International Organization for Standardization (ISO)
Latest
ISO 23697-2:2023
Scope
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.
ISO 23697-2:2023 Referenced Document
ISO 5667-1 Water quality — Sampling — Part 1: Guidance on the design of sampling programmes and sampling techniques*, 2023-03-14 Update
ISO 8466-1 Water quality — Calibration and evaluation of analytical methods — Part 1: Linear calibration function
ISO/IEC 17025 General requirements for the competence of testing and calibration laboratories [Standard in French]
ISO 23697-2:2023 history
2023ISO 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