SPECTROPHOTOMETRÄ°C STUDY OF THE COMPLEX FORMATÄ°ON OF COPPER (II) WÄ°TH 1-PHENYL-2- [2-HYDROXY-3-SULFO-5-NÄ°TROPHENYLAZO] 1,3-BUTADÄ°ONE Ä°N THE PRESENCE OF CATÄ°ONÄ°C SURFACTANTS. JAC. 2016;12(11):4543-4548. doi:10.24297/jac.v12i11.818