ISO 18191:2015
Water quality — Determination of pHt in sea water — Method using the indicator dye m-cresol purple
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.
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Foreword
Introduction
1 Scope
2 Terms and definitions
3 Principle
4 Reagents
5 Apparatus
6 Sampling
7 Procedure
8 Calculation and expression of results
8.1 Correction of measured absorbances
8.2 Calculation of the pHt of the sea water and indicator
8.3 Correction for pHt change resulting from addition of the indicator
Annex A (informative) Performance data
Annex B (informative) Storage stability
Bibliography
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Foreword
Introduction
1 Scope
2 Terms and definitions
3 Principle
4 Reagents
5 Apparatus
6 Sampling
7 Procedure
8 Calculation and expression of results
8.1 Correction of measured absorbances
8.2 Calculation of the pHt of the sea water and indicator
8.3 Correction for pHt change resulting from addition of the indicator
Annex A (informative) Performance data
Annex B (informative) Storage stability
Bibliography