QUANTIFICATION OF ULTRASONIC INTENSITY BASED ON THE DECOMPOSITION REACTION OF PORPHYRIN

A simple method is proposed for quantification of the effective ultras onic intensity in the reaction vessel based on the decomposition react ion of 5,10,15,20-tetrakis(4-sulfotophenyl) porphyrin (H2TPPS4-). The change of concentration of porphyrin in solution irradiated by the ult rasound wave depends on the irradiation time and the output power of u ltrasound generator. The decomposition ratio of porphyrin is defined a s the ratio of the concentration of porphyrin after ultrasonic irradia tion to that before ultrasonic irradiation. A linear relationship betw een the decomposition ratio of porphyrin and the concentration Fe3+ in the Fricke solution under sonication was obtained. The decomposition ratio was related to the absorption dose in radiation chemistry.