ISO 18191:2026
International Standard
Current Edition
·
Approved on
07 July 2026
Water quality — Determination of pHT in seawater — Method using the indicator dye m-cresol purple
ISO 18191:2026 Files
English
13 Pages
Current Edition
OMR
46.38
ISO 18191:2026 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.
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