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Opis: The bioavailability and toxicity of contaminants in sediments to benthic organisms depend on the speciation of the contaminant [1]. The level of iron supply to sediments creates contrasting chemical pathways, each producing distinctive mineral assemblag- es. Reliable measurement of Fe redox species (Fe2+ and Fe3+) in sediments is essential for studies of pollutants or trace-element cycling. This is, however, a difficult task, because the distribution of chemical species often changes during sampling and storage. In this work the Diffusive Gradients in Thin-films technique (DGT) is investigated as a passive sampling approach used in combination with photothermal beam deflection spectroscopy (BDS) as a detection method for determination of labile Fe-redox species in sediments and natural waters. DGT offers the advantage of pre-concentration of labile (i.e. bioavailable) Fe species from the total dissolved Fe pool in sediment pore waters [2]. The advantage of using BDS [3-4] is also in avoiding contamination by using additional steps as extraction or pre-concentration. Furthermore, combined DGT-BDS provides 2D information about distribution of Fe2+ and the total Fe content in the resin hydrogels [5]. The goal of this research is to show the repeatability of this technique for determining trace amounts of Fe redox species in environmental samples.
Najdeno v: ključnih besedah
Povzetek najdenega: ...sampling approach used in combination with photothermal beam deflection spectroscopy (BDS) as a detection method... ...beam deflection spectrometry, diffusive gradients in thin-films, iron species...
Ključne besede: beam deflection spectrometry, diffusive gradients in thin-films, iron species
Objavljeno: 16.07.2019; Ogledov: 611; Prenosov: 0
Polno besedilo (29,60 MB)

Najdeno v: ključnih besedah
Ključne besede: Diffusive Gradients in Thin Films, Beam Deflection Spectrometry, iron redox species
Objavljeno: 25.09.2019; Ogledov: 584; Prenosov: 0
Polno besedilo (1,28 MB)