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B51-14 (R2019) – Boiler, pressure vessel, and pressure piping code

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ISO 18191:2026

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

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This publication was last reviewed and confirmed in 2026.

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

Description

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.

Edition

2

Published Date

2026-07-09

Status

PUBLISHED

Pages

13

Language Detail Icon

English

Format Secure Icon

Secure PDF

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.

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