Improvements in a fast potentiometric seawater alkalinity determination

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F F Pérez
A F Ríos
T Rellán
M Álvarez

Abstract

 In the present paper, we introduce some methodological improvements in a potentiometric technique for determining seawater alkalinity. This fast method (about two minutes per sample) uses open flasks and an ordinary titration system without thermostatic bath. A new potassium hydrogen phthalate-borax 4.4 buffer is proposed to calibrate the electrode near the end point of the titration. The pH values of this new buffer at different pH-scales and temperatures were determined using spectrophotometry. The combined use of this easy and improved two end-point method for alkalinity determination and certified reference material enables the alkalinity to be determined with an accuracy lower than 1µmolkg–1(0.05%).

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How to Cite
F Pérez, F., F Ríos, A., Rellán, T., & Álvarez, M. (2000). Improvements in a fast potentiometric seawater alkalinity determination. Ciencias Marinas, 26(3), 463–478. https://doi.org/10.7773/cm.v26i3.592
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Research Article

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