Carbazine dyes and derivatives for ph measurement

C - Chemistry – Metallurgy – 09 – B

Patent

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Details

C09B 15/00 (2006.01) C07D 221/20 (2006.01) G01N 21/64 (2006.01) G01N 31/22 (2006.01)

Patent

CA 2219117

A composition for determining pH of a solution comprises a fluorescent carbazine dye covalently bound to a solid support. A method of determining pH of a solution comprises placing the composition in the solution, contacting the composition with a selected wavelength of light to excite fluorescence by the carbazine dye, measuring intensities of the fluorescence at two selected wavelengths, calculating a ratio of fluorescence intensities at the two selected wavelengths, and correlating the ratio with a predetermined relationship of such ratios to pH. A fiber optic system for measuring pH of a solution with the carbazine-dye-containing composition is also disclosed.

Cette invention concerne une composition qui comporte une teinture de carbazine fluorescente liée par covalence à un support solide et qui permet la mesure du pH d'une solution. Un procédé de mesure du pH d'une solution consiste à placer ladite composition dans la solution, à mettre en contact la composition avec un rayonnement de longueur d'onde sélectionné pour exciter la fluorescence de la teinture de carbazine, à mesurer l'intensité de la fluorescence émise pour deux longueurs d'onde sélectionnées, à calculer le rapport des intensités de fluorescence correspondant aux deux longueurs d'onde sélectionnées et à établir une corrélation entre ce rapport et une relation préétablie existant entre de tels rapports et le pH. L'invention concerne également un système à fibres optiques permettant d'effectuer la mesure du pH d'une solution avec cette composition contenant la teinture de carbazine.

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