abstract |
A device for determining carbon dioxide in a gaseous or liquid sample, comprises: a polymer matrix e.g. ethyl cellulose, polysiloxanes etc. and an indicator embedded in the polymer matrix, wherein the indicator comprises a pH-sensitive dye e.g. bromothymol blue, HPTS etc. and a lipophilic, metal cation-ionophore complex e.g. K-18-crown-6, and wherein an anion of the pH-sensitive dye and the metal cation-ionophore complex form an ion-pair which is soluble in the polymer matrix. |