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An electrochemical microcell was developed for potentiometric pH measurements of supercritical aqueous solutions. It has an internal volume of ca. 1.5cm 3 and a surface area of an electrode of 0.04cm 3 These values are around ten times lower than that of previous apparatus [K. Sue, M. Uchida, T. Usami, T. Adschiri, K. Arai, Apparatus for direct pH measurement of supercritical aqueous...
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