Source apportionment of surfactants in marine aerosols at different locations along the Malacca Straits
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This study aims to determine the source apportionment of surfactants in marine aerosols at two selected stations along the Malacca Straits. The aerosol samples were collected using a high volume sampler equipped with an impactor to separate coarse- and fine-mode aerosols. The concentrations of surfactants, as methylene blue active substance and disulphine blue active substance, were analysed using colorimetric method. Ion chromatography was employed to determine the ionic compositions. Principal component analysis combined with multiple linear regression was used to identify and quantify the sources of atmospheric surfactants. The results showed that the surfactants in tropical coastal environments are actively generated from natural and anthropogenic origins. Sea spray (generated from sea-surface microlayers) was found to be a major contributor to surfactants in both aerosol sizes. Meanwhile, the anthropogenic sources (motor vehicles/biomass burning) were predominant contributors to atmospheric surfactants in fine-mode aerosols.
KeywordsSurfactants Source apportionment Marine aerosol Sea-surface microlayer
This study was funded by the Ministry of Science, Technology and Innovation of Malaysia (MOSTI) research grant, E-Science Fund 04-01-02-SF0752. We would like to thank Mrs. Caroline Brimblecombe, Ms. K Alexander and Ms. Fatimah Ahamad for proof reading this manuscript.
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