# ISO 18191:2015 — Withdrawn and superseded ISO standards

For ISO 18191:2015, item title is Water quality — Determination of pHt in sea water — Method using the indicator dye m-cresol purple; status code is 9599; successor is ISO 18191:2026; withdrawn / published date is 2015-09-01, recorded from its source on 2026-08-05.

- **Identifier:** ISO 18191:2015 _(verified: appears in the quote below)_
- **Item title:** Water quality — Determination of pHt in sea water — Method using the indicator dye m-cresol purple _(verified: appears in the quote below)_
- **Status code:** 9599 _(verified: appears in the quote below)_
- **Successor:** ISO 18191:2026
- **Withdrawn / published date:** 2015-09-01 _(verified: appears in the quote below)_

## What the source says

> 61730,IS,,ISO 18191:2015,Water quality — Determination of pHt in sea water — Method using the indicator dye m-cresol purple,Qualité de l'eau — Détermination du pHt dans l'eau de mer — Méthode utilisant l'indicateur coloré au pourpre de m-crésol,2015-09-01,1,['13.060.50'],ISO/TC 147/SC 2,9599,,[86836],['en'],11,"<p>ISO 18191:2015 specifies a spectrophotometric determination of the pH<sub>t</sub> of sea water on the total hydrogen ion concentration pH scale using the indicator dye <i>m</i>-cresol purple. The total hydrogen ion concentration, [H<sup>+</sup>]<sub>t</sub>, is expressed as moles per kilogram of sea water. The method is suitable for assaying oceanic levels of pH<sub>t</sub> 7,4 to

## Source

- https://isopublicstorageprod.blob.core.windows.net/opendata/_latest/iso_deliverables_metadata/csv/iso_deliverables_metadata.csv

Last verified: 2026-08-05. Review by: 2027-02-01.
Part of [Withdrawn and superseded ISO standards](https://referencesource.org/iso-standard-supersessions/).