Traceability of pHT values of equimolal TRIS buffered artificial seawater solutions in brackish waters

Frank Bastkowski, Beatrice Sander, Steffen Seitz, Jens Daniel Müller

Abstract

Assessment of seawater acidification can be achieved by the measurement of pH. A prerequisite for reliable and comparable pH values is traceability of pH measurement results to an agreed higher order pH standard. While this has already been established for low ionic strength aqueous solutions, traceability of pH measurement results for high ionic strength solutions is about to be realized for artificial seawater samples in the middle salinity range (5-20) on the so called total pH scale (pHT). In the present work we show details of the pHT measurement procedure for the measurement of TRIS (Tris(hydroxymethyl)- aminomethane) buffered artificial seawater solutions and the traceability of the measurement results to the SI system of units.

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IMEKO-TC19-METROSEA-2017-43.pdf

DOI

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IMEKO TC

TC19 - Environmental Measurements

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