A selective optical chemical sensor for the determination of Tween-60 based on fluorescence enhancement of tetraphenylporphyrin Original Research Article

An optical chemical sensor has been developed for the determination of Tween-60 in aqueous solution based on the fluorescence enhancement of tetraphenylporphyrin (H2TPP) immobilized in a plasticized poly(vinyl chloride)(PVC) membrane. The sensing principle of the proposed sensor for Tween-60 is discussed in detail. The fluorescence enhancement of sensing membrane results from an associated complex formation between H2TPP and Tween-60. With the optimum condition described, from 8.0 to 100 μg ml−1 Tween-60 in the sample solution can be determined. The response time of the sensor is within 1.0 min. In addition to the high reproducibility and reversibility of the fluorescence signal, the sensor also exhibits good selectivity over other common surfactants except for Tween-80.