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Oxidation of Sodium Dodecylbenzenesulfonate with Chrysotile: On‐line Monitoring by Membrane Introduction Mass Spectrometry
Author(s) -
Fachini Adriano,
Mendes Maria A.,
Joekes Inés,
Eberlin Marcos N.
Publication year - 2007
Publication title -
journal of surfactants and detergents
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.349
H-Index - 48
eISSN - 1558-9293
pISSN - 1097-3958
DOI - 10.1007/s11743-007-1032-8
Subject(s) - chemistry , sodium dodecylbenzenesulfonate , chrysotile , pulmonary surfactant , aqueous solution , catalysis , membrane , adsorption , mass spectrometry , degradation (telecommunications) , inorganic chemistry , chromatography , organic chemistry , telecommunications , biochemistry , materials science , asbestos , computer science , metallurgy
Chrysotile was tested for anionic surfactant (SDBS) removal from aqueous solutions. Results showed that the reduction was due to a catalytic process onto the chrysotile surface, which is formed of hydroxyl groups. Trap and release membrane introduction mass spectrometry using a modified direct insertion membrane probe (DIMP‐T&R‐MIMS) was used to monitor on‐line SDBS oxidation by air in an aqueous alkaline media containing chrysotile. It was possible to estimate the amount of CO 2 formed in SDBS catalyzed reaction through quantification of CO 2 formed by the hydrolysis of MgCO 3 . A mass balance for the SDBS reaction is proposed. DIMP‐T&R‐MIMS monitoring identified no VOCs or SVOCs as degradation intermediates, but CO 2 was detected to account for SDBS degradation. Hence, simple chrysotile adsorption is excluded as a main process of SDBS consumption, and a “SDBS in‐CO 2 out” mechanism on the chrysotile surface accounts for the experimental observations.