Surface flux and vertical profile of dimethyl sulfide in acid sulfate soils at Cudgen Lake, northern New South Wales, Australia. (August 2019)

• Record Type: Journal Article
• Authors: Swan, Hilton B.; Deschaseaux, Elisabeth S.M.; Eyre, Bradley D.; Jones, Graham B.
• Is Part Of: Chemosphere. Volume 228(2019)
• Page Start: 309
• Page End: 317
• Publication Date: 2019-08
• Subjects: Acid sulfate soils -- Volatile organic sulfur compounds -- Dimethyl sulfide -- Vertical profile -- Surface flux -- Cudgen lake; Pollution -- Periodicals; Pollution -- Physiological effect -- Periodicals; Environmental sciences -- Periodicals; Atmospheric chemistry -- Periodicals; 551.511
• DOI: 10.1016/j.chemosphere.2019.04.129
• Languages: English
• ISSNs: 0045-6535

Abstract

Abstract: A dimethyl sulfide (DMS) vertical concentration profile and DMS surface emission flux were quantified in undisturbed acid sulfate soils (ASS) at Cudgen Lake on the north coast of New South Wales, Australia. A deuterated internal standard was used to account for soil adsorption characteristics. The DMS vertical concentration profile increased exponentially from 0.6 m depth to the surface layer. This profile reflected the adsorption properties of the ASS horizons present and the experimentally determined octanol/water partition coefficient for DMS of 1.36, suggesting that DMS would be mobilised in the soil water medium for upward translocation in time due to surface evaporation. The organic material in the oxidised ASS crustal layer had a chemically strong adsorption affinity for DMS, which appeared to restrain its emission from surface soil particles to the atmosphere. The seasonally averaged DMS surface flux estimate from the Cudgen Lake ASS was 9 ng S m −2 min −1, which is relatively low by comparison to DMS fluxes reported from other wetland soils such as salt-marshes and acidic peat bogs. The worldwide annual average DMS emission from ASS was estimated to be 1.14 × 10 −3 Tg S, which is globally insignificant by comparison to DMS emission from the world's oceans. Graphical abstract: Image 1 Highlights: Dimethyl sulfide is most abundant in the oxidised organic crustal soil layer. Soil-air surface flux of dimethyl sulfide is restrained by crustal adsorption. Acid sulfate soils appear to be a globally insignificant source of dimethyl sulfide.