Three porphyrin complexes of palladium were chosen as phosphorescence sensing molecules : palladium - meso - tetra ( trimethylaminophenyl ) porphyrin ( pd - tapp ) , palladium - coporphyrin ( pdcp ) and palladium - meso - tetra ( p - sulfonicphenyl ) porphyrin ( pd - tspp ) . they were bound to dowex resins , and made into oxygen sensor . we detected the characteristics such as sensitivities and response times combined with flow injection analysis ( fia ) technology
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