期刊
ANALYTICAL CHEMISTRY
卷 83, 期 1, 页码 18-22出版社
AMER CHEMICAL SOC
DOI: 10.1021/ac1025754
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资金
- Irish Department of Agriculture [08RDC642]
A new sensor is described based on a phosphorescent metalloporphyrin dye incorporated in a polymeric membrane, which allows measurement of the two important analytes, oxygen and pH. In such a sensor, the bifunctional dye is quenched by O-2 altering its phosphorescence intensity and lifetime (0-21 kPa O-2), whereas protonation of the dye causes a major change in the absorption spectrum and also reduces the phosphorescence intensity. As a result, quantification and continuous monitoring of the two analytes can be achieved by (i) simultaneous phosphorescence intensity (O-2, pH) and lifetime (O-2) measurements and (ii) parallel phosphorescence lifetime (O-2) and ratiometric absorbance (pH) measurements. Although the first method generally requires sensor calibration in intensity mode, the second provides internal referencing and calibration-free capabilities for both analytes. This approach can be extended to sensing of some other analytes.
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