GSO ISO 18191:2021
ISO 18191:2015
Gulf Standard
Current Edition
·
Approved on
01 July 2021
Water quality — Determination of pHt in sea water — Method using the indicator dye m-cresol purple
GSO ISO 18191:2021 Files
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GSO ISO 18191:2021 Scope
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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