ISO 23695:2023
Water quality — Determination of ammonium nitrogen in water — Small-scale sealed tube method

Standard No.

ISO 23695:2023

Release Date

2023

Published By

International Organization for Standardization (ISO)

Latest

ISO 23695:2023

Scope

This document specifies a method for the determination of ammonium nitrogen (NH4-N) in drinking water, groundwater, surface water, wastewater, bathing water and mineral water using the small-scale sealed tube method. The result can be expressed as NH4 or NH4-N or NH3 or NH3-N. NOTE 1 In the habitual language use of sewage treatment and on the displays of automated sealed-tube test photometers or spectrophotometers, NH4 without indication of the positive charge has become the common notation for the parameter ammonium. This notation is adopted in this document even though not being quite correct chemical nomenclature. This method is applicable to (NH4-N) concentration ranges from 0,01 mg/l to 1800 mg/l of NH4-N. The measuring ranges of concentration can vary depending on the type of small-scale sealed tube method of different manufacturers. Concentrations even slightly higher than the upper limit indicated in the manufacturers manual relating to the small-scale sealed tube method used, cannot be reported as accurate results. 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 2 The results of a small-scale sealed tube are most precise in the middle of the application range of the test. All manufacturers' methods are based on the Berthelot reaction and its modifications to develop indophenol blue colour. Reagents mixtures can differ slightly based on manufacturers small-scale sealed tube method, see Clause 9. This method is applicable to non-preserved samples by using small- scale sealed tubes for the determination of drinking water, groundwater, surface water, wastewater and to preserved samples. The method is applicable to samples with suspended materials if these materials are removable by filtration.

ISO 23695:2023 Referenced Document

• ISO 5664 Water quality; Determination of ammonium; Distillation and titration method
• ISO 5667-1 Water quality — Sampling — Part 1: Guidance on the design of sampling programmes and sampling techniques*， 2023-03-14 Update
• ISO 5667-3 Water quality*， 2024-02-01 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 23695:2023 history

• 2023 ISO 23695:2023 Water quality — Determination of ammonium nitrogen in water — Small-scale sealed tube method