3. フェノールフタレインを用いた超音波強度の簡易測定法の検討

抄録

The discoloration time of aqueous phenolphthalein solutions under sonication was examined. The Sonoreactor (HUS-1) which made in HON DA Electron Co. Ltd. was used. Ultrasonic frequencies of 44.0, 92.6, 127.3, 140.5, 518.0, and 1066. 0kHz were used. The pH-value was determined by the PH/ISE of ORION Co. Ltd., at 25℃ under the nitrogen atmosphere. The concentration ranges of phenolphthalein solutions were from 1.57xlO^<-5> to 9.42x10^<-5> mol/l. All the experimental were carried out at 25℃. The discoloration time depended on the concentration of phenolphthalein and the pH value of solutions. The discoloration time was correlated to the ultrasonic energy consumed in a reaction vessel, which is estimated on the basis of decomposition reaction of porphyrin. From these results, it was indicated that aqueous solution of phenolphthalein is useful for simple quantification of ultrasonic intensity for practical use.