Abstract
The effect of ultrasonic irradiation on the complexation of lead(II) with α, β, γ, δ-tetraphenylporphinetetrasulfonic acid (TPPS) was studied. The formation of the lead(II)-TPPS complex which proceeds slowly at room temperature was appreciably promoted by ultrasonic irradiation. A change in the absorbance of the lead(II)-TPPS complex was observed at the maximum absorption wavelength of the Soret band, 464 nm, at pH 10.4. Three ultrasonic frequencies of 28, 45 and 100 kHz were used for this experiment. Irradiation at a frequency of 28 kHz gave the highest absorbance. The effect of irradiation on the formation of lead(II)-TPPS complex increased with decreasing in the frequency. Maximum absorbance was attained after 20-min irradiation at 28 kHz. The absorbance resulting after standing at room temperature for 40 min without irradiation was equal to that by irradiation at 28 kHz for only 10 min.
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