Cationisation of oligomeric alkylethoxylate surfactants in ToF‐SIMS analysis |
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| Authors: | M. C. Perkins D. Briggs F. J. M. Rutten C. J. Roberts M. C. Davies |
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| Affiliation: | 1. Laboratory of Biophysics and Surface Analysis, School of Pharmacy, The University of Nottingham, University Park, Nottingham NG7 2RD, UK;2. Laboratory of Biophysics and Surface Analysis, School of Pharmacy, The University of Nottingham, University Park, Nottingham NG7 2RD, UKResearch Institute for the Environment, Physical Sciences and Applied Mathematics (iEPSAM), Lennard‐Jones Laboratories, Keele University, Keele ST5 5BG, UK. |
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| Abstract: | Variable cationisation of the alkylethoxylate surfactant Synperonic A7? has been observed during a ToF‐SIMS study of its interaction with a leaf surface, either by itself or as a component in a simple herbicide formulation. Depending on the conditions, cationisation predominantly by K+, Na+ and H+ was found. By deliberate surfactant solution doping with alkali bromides, the cationisation channel could be manipulated. Comparison of the apparent molecular weight dependence, derived from the ToF‐SIMS spectra, with that measured by HPLC‐MS, showed a further dependence on the cationising species, with Na+ giving the best match. An understanding of these effects is critical to the correct interpretation of the spectra from this surfactant. Copyright © 2007 John Wiley & Sons, Ltd. |
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| Keywords: | cationisation ToF‐SIMS alkylethoxylate surfactant Synperonic A7™ plant leaf agrochemical |
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