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ISO 18191:2026

Water quality — Determination of pHT in seawater — Method using the indicator dye m-cresol purple ISO 18191:2026

Publication date:   Jul 7, 2026

General information

60.60   Standard published   Jul 7, 2026

ISO

ISO/TC 147/SC 2 Physical, chemical and biochemical methods

International Standard

13.060.50   Examination of water for chemical substances

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Scope

This document specifies a spectrophotometric determination of the pHT of seawater on the total hydrogen ion concentration pH scale. The total hydrogen ion concentration, [H+]T, is expressed as moles per kilogram of seawater. The method is suitable for assaying oceanic levels of pHT from 7,4 to 8,2 for normal seawater of practical salinity ranging from 20 to 40.

Life cycle

PREVIOUSLY

WITHDRAWN
ISO 18191:2015

NOW

PUBLISHED
ISO 18191:2026
60.60 Standard published
Jul 7, 2026




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