ISO 18191:2026

Current Revision
Water quality - Determination of pHT in seawater - Method using the indicator dye m-cresol purple

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ISO 18191:2026

Water quality - Determination of pHT in seawater - Method using the indicator dye m-cresol purple

PUBLISH DATE 2026
ISO 18191:2026

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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