Draft
International Standard
ISO/DIS 18191
Water quality — Determination of pHT in sea water — Method using the indicator dye m-cresol purple
Reference number
ISO/DIS 18191
Edition 2
© ISO 2025
Draft International Standard
Under development
This Draft International Standard is in the enquiry phase with ISO members.
Will replace ISO 18191:2015

Abstract

ISO 18191:2015 specifies a spectrophotometric determination of the pHt of sea water on the total hydrogen ion concentration pH scale using the indicator dye m-cresol purple. The total hydrogen ion concentration, [H+]t, is expressed as moles per kilogram of sea water. The method is suitable for assaying oceanic levels of pHt 7,4 to 8,2 for normal sea water of practical salinity ranging from 20 to 40.

General information

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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