Method for measuring the concentration of a substance in a solution
AssigneeGambro AB
InventorsRaymond Edgson, Arfon Goodman-Jones, Bo Olde, Lars-Fride Olsson
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Abstract
Methods and apparatus for measuring the concentration of decomposable substances, such as urea, are disclosed. The disclosed methods include adding a gaseous buffer, such as CO.sub.2, to the solution containing the decomposable compound, measuring the conductivity of the solution, decomposing the decomposable compound, measuring the conductivity of the thus-decomposed compound solution, and calculating the differential conductivities between the two measured solutions. The apparatus for carrying out these methods are also disclosed.
Claims25
A method for measuring the concentration of a decomposable compound in a solution comprising adding a buffer in gaseous form to said solution, measuring the conductivity of said solution, decomposing said decomposable compound so as to produce a reacted solution, measuring the conductivity of said reacted solution, and calculating the differential conductivities between said solution and said reacted solution so as to provide a measure of the concentration of said decomposable compound in said solution, wherein said buffer in gaseous form comprises carbon dioxide.
A method for measuring the concentration of a decomposable compound in a solution comprising adding a buffer in gaseous form to said solution, dividing said solution into a first portion and a second portion, decomposing said decomposable compound in said first portion of said solution so as to provide a first reacted solution, equalizing the temperatures of said first reacted solution and said second portion of said solution in a heat exchanger having a mean temperature, measuring the conductivities of said temperature equalized first reacted solution and second portion of said solution, and calculating the differential conductivity between said first reacted solution and said second portion of said solution, temperature compensating said differential conductivity by means of the mean temperature of said heat exchanger, and calculating said concentration of said decoposable compound from said compensated differential conductivity, wherein said buffer in gaseous form comprises carbon dioxide.
Dependencies are inferred from the claim text.