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BSI BS EN ISO 23697-2:2025

Water quality — Determination of total bound nitrogen (ST-TNb) in water using small-scale sealed tubes -- Chromotropic acid colour reaction
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BSI BS EN ISO 23697-2:2025

Water quality — Determination of total bound nitrogen (ST-TNb) in water using small-scale sealed tubes -- Chromotropic acid colour reaction

PUBLISH DATE 2025
PAGES 18
BSI BS EN ISO 23697-2:2025
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.
SDO BSI: British Standards Institution
Document Number ISO 23697-2
Publication Date Dec. 22, 2025
Language en - English
Page Count 18
Revision Level
Supercedes
Committee EH/3
Publish Date Document Id Type View
Feb. 7, 2023 BS ISO 23697-2:2023 Revision
Dec. 22, 2025 BS EN ISO 23697-2:2025 Consolidated