The reversed-flow gas chromatography technique as a tool for the study of the evaporation retardation of SO2and (CH3)2S from water by soluble surfactants.
In the present work the evaporation retardation of SO2and (CH3)2S (=DMS) from water by soluble surfactants was studied by the Reversed-Flow Gas Chromatography (R.F.G.C.) technique. Using suitable mathematical analysis, rate coefficients, kc, for the transfer of SO2and DMS from pure or artificial sea water to the atmospheric environment were determined in the presence or the absence of surfactants. The efficiency of the three surfactants used (CTAB, TRITON X-100 and SDS) to retard the evaporation rate of SO2and DMS from water was estimated by the decrease of the kcvalues in the presence of the three surfactants, compared to those in the absence of surfactants. The more efficient surfactant for the retardation evaporation of SO2from both the pure and the artificial sea water was found to be the cationic CTAB surfactant, as the maximum decreases of the kcvalues were found to be 4.61×10-3cms-1(number of films, n=1) and 3.07×10-3cms-1(n=3), respectively. On the other hand, more efficient surfactant for the retardation evaporation of DMS from pure water was found to be the non-ionic TRITON X-100, in which the decrease of the kcvalue was estimated to be 18.20×10-3cms-1(n=3) and from artificial sea water the cationic CTAB surfactant in which the decrease of the kcvalue was found to be 8.24×10-3cms-1(n=3). Finally, the precision of the R.F.G.C. method in studying the retardation effect of various surfactants in the transfer of SO2and DMS from the water body to the atmosphere is estimated (mean value 96.69%), and the experimental values of kcare compared with those given in the literature.
Department of Chemistry, University of Patras, GR-26504 Patras, Greece.
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Sevastos
Department of Chemistry, University of Patras, GR-26504 Patras, Greece.
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Kotsalos
Department of Chemistry, University of Patras, GR-26504 Patras, Greece. Electronic address: akoliadima@upatras.gr.
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Koliadima
Air–water interface; Evaporation of (CH(3))(2)S; Evaporation of SO(2); Reversed–flow gas chromatography; Surfactants