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Abstract
The performance of an automatic instrument which allows one to measure discontinously (every 20 minutes) bicarbonate alkalinity (BA) in complex organic solutions is evaluated. Bicarbonate concentration is determined from overpressure measurements in a sealed vessel where inorganic carbon is completely converted to carbon dioxide after acidification of the sample. The accuracy of the instrument has been tested as a function of various operating parameters (ratio of overhead gas volume in the vessel over the liquid sample volume, concentration of bicarbonates and temperature). Error sources were evaluated and operating conditions which yield satisfactory performance identified.