International Standard
ISO 18191:2026
Water quality — Determination of pHT in seawater — Method using the indicator dye m-cresol purple
Reference number
ISO 18191:2026
Edition 2
2026-07
© ISO 2026
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Published (Edition 2, 2026)

ISO 18191:2026

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Abstract

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.

General information

  • Status
     : Published
    Publication date
     : 2026-07
    Stage
    : International Standard published [60.60]
  • Edition
     : 2
    Number of pages
     : 13
  • Technical Committee :
    ISO/TC 147/SC 2
    ICS :
    13.060.50 
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Life cycle

Sustainable Development Goals

This standard contributes to the following Sustainable Development Goals

3
Good Health and Well-being
6
Clean Water and Sanitation

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