| 摘要 |
An ion selective optrode or optical chemical sensor makes use of a primary absorber dye (14) whose color changes with the analyte concentration, and a fluorophore (18) whose excitation and/or emission is modulated by the changing absorption of the dye (14). In a membrane (10), an ion carrier (12) captures target ions X+ from a solution (16). Through charge exchange or co-extraction, the absorber changes its absorption characteristics and acts as an inner filter. The sensing scheme provides high flexibility in the selection of dyes and results in detection limits on the order of 1 mu mole. The preferred absorber dye is 4-(2'-4'-dinitrobenzeneazo)-2-octadecylaminocarbonyl-1-naphthol. |
