British Standards Institution

Source:: ISO
Committee:: EH/3/2 - Physical chemical and biochemical methods
Categories:: Water. Examination. Chemical substances
Comment period start date:: 17/06/2025
Comment period end date:: 10/08/2025
Number of comments:: 0

Comment by:

10th Aug

Scope

Type text. This International Standard specifies a spectrophotometric determination of the pHT of sea water on the total hydrogen ion concentration pH scale. 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 from 7,4 to 8,2 for normal sea water of practical salinity ranging from 20 to 40.

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Please email further comments to: debbie.stead@bsigroup.com

Standard timeline

1. Proposal (Complete)

Proposal start date:

2. Draft (Complete)

Draft start date:

14/04/2025

3. Public Comments

Public Comments start date:

17/06/2025

Public Comments end date:

10/08/2025

Learn more about the standards development process

Standards Development

BS ISO 18191 Water quality — Determination of pHt in sea water — Method using the indicator dye m-cresol purple

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