Electricity: measuring and testing – Electrolyte properties – Using a conductivity determining device
Patent
1980-03-13
1982-03-23
Tokar, Michael J.
Electricity: measuring and testing
Electrolyte properties
Using a conductivity determining device
324439, 324450, G01N 2742
Patent
active
043215459
ABSTRACT:
A method and apparatus wherein a sample of gas or fluid containing carbon dioxide in the form of dissolved carbon dioxide gas, bicarbonate ion, and/or carbonate ion is injected into an extraction chamber provided with an acid extracting fluid. A carbon dioxide-free gas stream is passed through the extraction chamber in order to carry the dissolved CO.sub.2 gas formed from bicarbonate and carbonate ions, as well as that already present, onto a spiral absorbing column, wherein a dilute alkaline solution absorbs the CO.sub.2 with a resulting change in electrical conductivity of the alkaline solution. The system disclosed provides electrical means for measuring the conductivity difference thus produced, means for conversion of this difference to an appropriately coded electrical signal, and means for providing a direct display of the sample concentration. Means are provided for indicating when a sample is being processed by the apparatus, and for holding the displayed concentration until manually re-set. Two types of extraction chambers are disclosed, one for gas and non-foaming liquids, and a second for foaming liquids such as blood. The method and apparatus is suitable for use with samples containing as little as 20 nano-Moles (10.sup.-9 Moles) of carbon dioxide in all forms.
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patent: 3874850 (1975-04-01), Sorensen
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patent: 4228400 (1980-10-01), Bruckenstein
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