Effect of ultrasonic wave on associating state of weak acidity Oprah Red B dye

In order to reduce the dye′s associating degree in solution,the effect of ultrasonic wave on dye associating state was studied via determination of conductivity and visible absorption spectrum change of the dye liquor.The results showed that the maximum absorption wavelength of the dye solution exhibited decreasing gradually and a blue shift with the increase in the concentration of weak acid Oprah Red B solution and,and its association concentration was determined as 1×10-5 mol/L.As the temperature increases,the increase of the conductivity of the ultrasonically processed dye solution was higher than that of the non-ultrasonically processed dye solution when the association concentration of dye solution is higher than that of dye.At 50 ℃,the electrical conductivity of the dye solution gradually increased with the ultrasonic processing time,and a red shift of the λmax occurred,with a decrease in the absorbance of spectrum of the corresponding shoulder peak.