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The equilibrium concentration of the surfactant in the solution after adsorption was determined by a variation of the Methylene blue method described in ref 23. The method is based on the extraction of the complex formed by Methylene blue with the sulfonated surfactant into chloroform and its subsequent colorimetric measurement at 256 nm.
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(23) . Greenberg, A. E., Clesceri, L. S., Eaton, A. D., Franson, M. A.H., Eds. Standard Methods for the Examination of Water and Waste-water, 18th ed.; American Public Health Association, American Water Works Association, Water Environment Federation: Washington, DC,1992; p 5.
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