Open Access Open Access  Restricted Access Subscription or Fee Access

Effect of the U.V. Irradiation on the Aqueous Solution of Dye (i.e. Cresol Purple)

Enas A Almadani, Hamad M Adress


This study aimed to estimate the effect of the U.V. irradiation on the aqueous solution of cresol purple. Then study the effect of the activation energy of each electron transfere on the absorbance and λmax values. The absorbance and λmax values of the selective λmax solutions were chanced in most solutions, where the U.V radiation gave different values at different irradiation periods, most of solution gave low values of absorbance comparing with the original standard solutions of the indicator and the λmax were changed, most of solution showed a relative changes in λmax values and gave high absorbance values comparing with the original standard solutions of dye. The study attributed those changes in absorbance are due to the effecting to U.V irradiations on the type of electronic transition of π → π* and πn → π* which they were attributed to the original structure of the indicator used. The spectra of absorption of the unirradiated and irradiated solutions were measured in the wavelength from 250 to 650 nm according to λmax of the original solution. The λmax values were measured by studying the λmax change at different time periods (5, 10, 15, 20 min) of U.V irradiance. To calculate the transition energy values were used the equation (ET = h C NA/λ).



Cresol purple, aqueous solution, U.V. irradiation, transition energy, λmax

Full Text:



Albert, C. Chemical Applications of Group Theory. 3rd ed. John Wiley & Sons, New Jersey; 1990.

Gary, M., Tarr, D. Inorganic Chemistry. 2nd ed. New Jersey:Pearson Education Inc; 2004.

H Daniel, M Bertolucci, Symmetry and Spectroscopy. An Introduction to Vibration and Electronic Spectroscopy. Dover Publications, United States ; 1 January 1989

Ooshika Y. Absorption spectra of dyes in solution. Journal of the physical society of Japan. 1954;9(4):594-602.

EG McRae. Theory of solvent effects on molecular electronic spectra. Frequency shifts. The Journal of Physical Chemistry. 1957;61(5):562-572.

Lippert, E. Dipolmoment und elektronstrukturen von angeregten molekülen. Z. Naturforsch.10 A,1995;541-545p.

Bakhshiev, N.G. Universal intermolecular interactions and their effect on the position of the electronic spectra of molecules in two component solutions V. dependence of the spectra on the electrical properties, dimensions, and structure of the molecules under Study Optics and Spectroscopy. Opt. Spectrosk., 13, (1962).24-29 .

Loucaides, S, Victoire M.C.R, Stathys P, et al. Characterization of meta-Cresol Purple for spectrophotometric pH measurements in saline and hypersaline media at sub-zero temperatures. Scientific Reports.2017; 7 (1): 2481.

S Khezrianjoo, HD Revanasiddappa. Electrochemical oxidation of m-cresol purple dye in aqueous media. Water Quality Research Journal of Canada. 2015;50(4):305-313.

A Enas, A., A Hamad. M., Kwakob Safoan. F. Using of the Sea Grasses for the Removal of some Industrial Organic Dyes; Bromo Cresol Purple from Aqueous Solutions. Emerging trends in Chemical Engineering. 2019;6(3):1-8.

Abe T. Theory of solvent effects on molecular electronic spectra. Frequency shifts. Bulletin of the Chemical Society of Japan. 1965 Aug; 38(8):1314-1318.


  • There are currently no refbacks.