|Title:||Determination of bioavailable Fe redox fractions of sediment pore waters by DGT passive sampling and BDS detection|
|Authors:||Budasheva, Hanna (Author)|
Korte, Dorota (Author)
Bratkič, Arne (Author)
Franko, Mladen (Author)
|Files:||This document has no files. This document may have a phisical copy in the library of the organization, check the status via COBISS. |
|Work type:||Not categorized (r6)|
|Tipology:||1.12 - Published Scientific Conference Contribution Abstract|
|Organization:||UNG - University of Nova Gorica|
|Abstract:||The bioavailability and toxicity of contaminants in sediments to benthic organisms depend on the speciation of the contaminant . 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 . 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 .
The goal of this research is to show the repeatability of this technique for determining trace amounts of Fe redox species in environmental samples.|
|Keywords:||beam deflection spectrometry, diffusive gradients in thin-films, iron species|
|Year of publishing:||2019|
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