Analytical method for determining acid/salt and base/salt...

G - Physics – 01 – N

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G01N 27/08 (2006.01) G01N 27/06 (2006.01) G01N 30/00 (2006.01) G01N 30/96 (2006.01)

Patent

CA 1108517

Abstract Acid or base species concentrations in aqueous sample solutions are determined in the presence of interfering ionic salts. Concentration of acid or base species is determined by a flow injection method combined with differential con- ductivity detection and ion-exchange derivatization wherein the acid or base species is derivatized to water or absorbed and blended indistinguishably into an aqueous carrier phase, and wherein the inter- fering salt(s) is derivatized in whole or in part to a distinguishable hydroxide or acid derivative(s). In a detector read-out, the calibrated peak of a con- ductimeteric response of the salt derivative(s) is compared to the peak of a conductimetric response of the sample solution and the response differential is displayed and used to determine the acid or base species concentration. The salt(s) concentration is determined since it is proportional to the first men- tioned peak. The technique has utility with respect to acids and bases and most advantageously to strong and moderately strong acids and bases of PKa and PKb value, respectively, of less than 2.

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