Spectrophotometric Determination of Cationic and Anionic Surfactants with Anionic Dyes in the Presence of Nonionic Surfactants, Part I: A General Aspect
Shoji Motomizu, Mitsuko Oshima, and Yasuhiro Hosoi. Mikrochim Acta 106, 57-66 (1992)
…The addition of alcohols, organic onium ions, anionic surfactants and nonionic surfactants brought about a decrease of the band at wavelengths near 480 nm and an increase of the band at wavelengths near 420 nm. Such a shift toward the shorter wavelengths in spectra was attributed to the change of the micro-environment around the dyes from a polar field to a less polar field…