title: Identification of unknown surfactants using electrospray mass spectrometry and NMR spectroscopy preceded by liquid ionization mass spectrometry.
abstract: Commercially available but completely unknown surfactants used in the tin-lead plating industry were successfully identified by using electrospray mass spectrometry and NMR spectroscopy techniques, preceded by liquid ionization mass spectrometry used to obtain the preliminary information. The mass spectral data suggested that ethoxylated nonionic surfactants having a homologous distribution of molecular weights like 520, 564, 608, 652, 696, etc. were present. The NMR data suggested the presence of two aromatic rings and a quaternary carbon for the hydrophobe moiety instead of the well-known alkyl chains or alkylphenols. The unknown surfactants were finally concluded to be novel nonionic 4-(alpha,alpha-dimethylbenzyl)-phenol ethoxylates.
authors.affiliation: Department of Analytical Chemistry, Faculty of Engineering, Yokohama National University, Hodogaya, Japan. yokyuk@ynu.ac.jp
authors.forename: Yukio
authors.initials: Y
authors.lastname: Yokoyama
authors.forename: Yoshiyuki
authors.initials: Y
authors.lastname: Fukazawa
authors.forename: Takashi
authors.initials: T
authors.lastname: Ito
authors.forename: Hisakuni
authors.initials: H
authors.lastname: Sato
mesh_terms: D002244:Carbon / Q000737:chemistry; D007477:Ions; D009682:Magnetic Resonance Spectroscopy / Q000379:methods*; D008956:Models, Chemical; D021241:Spectrometry, Mass, Electrospray Ionization / Q000379:methods*; D017550:Spectroscopy, Fourier Transform Infrared / Q000379:methods; D013501:Surface-Active Agents / Q000737:chemistry*
chemical_list: D007477:Ions; D013501:Surface-Active Agents; D002244:Carbon