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Recebido em 22/7/03; aceito em 26/3/04; publicado na web em 27/7/04 DETERMINATION OF THE CRITICAL MICELLE CONCENTRATION OF HUMIC ACIDS BY SPECTROSCOPY AND CONDUCTIMETRIC MEASUREMENTS. The aim of this study was the determination of the critical micelle concentration (CMC) of the sodium dodecyl sulfate (SDS) surfactant using spectroscopic and conductimetric determinations and to compare these methodologies in the determination of the CMC of different humic acids (HA). The CMC obtained bydoi:10.1590/s0100-40422004000500004 fatcat:2oj6es72qbfwjghanv2at73hla