Authors: Duarte, Regina¹; Duarte, Armando²

Source: Journal of Atmospheric Chemistry, Volume 51, Number 1, May 2005 , pp. 79-93(15)

Publisher: Springer

Abstract:

A detailed procedure using non-ionic macropourous XAD-8 and XAD-4 resins is presented for the isolation and fractionation of aerosol water-soluble organic compounds (WSOC) from aerosol samples. The procedure entails adsorption of WSOC fraction onto XAD-8 and XAD-4 resins, desalting of the adsorbed organic material with ultra-pure water, elution of the retained organic matter with 40% MeOH solution and freeze-drying. Due to resin’s different properties and to certain hydrophobic/hydrophilic interactions between the resin polymers and the organic matter, two major fractions were obtained; namely the XAD-8 and the XAD-4 eluates. The XAD-8 eluate, which accounts for 55–60% of total aerosol WSOC, is represented by partially acidic compounds with significant hydrophobic moieties. The XAD-4 fraction holds few conjugated systems and a higher content of hydrophilic structures with low molecular size, and accounts for 9% of total WSOC. The isolated WSOC sub-fractions were nearly free from inorganic species, and successful recoveries of organic matter from the resins were accomplished. With this procedure the XAD-8 eluate yields a mixture representative of those WSOC that are highly conjugated compounds in atmospheric aerosols. It also allows a successful characterisation of the organic material by advanced analytical techniques without the interference of inorganic species present in the original sample of atmospheric particles.

Keywords: XAD resins; isolation; fractionation; water-soluble organic compounds; atmospheric aerosols

Document Type: Research article

DOI: http://dx.doi.org/10.1007/s10874-005-8091-x

Affiliations: 1: Department of Chemistry, University of Aveiro, 3810-193, Aveiro, Portugal, Email: rduarte@dq.ua.pt 2: Department of Chemistry, University of Aveiro, 3810-193, Aveiro, Portugal,

Publication date: 2005-05-01

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