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Title:Selenium affects mercury ligand environment in terrestrial food chain – a XAS study
Authors:ID Vogel Mikuš, Katarina, Uni-Lj (Author)
ID Kodre, Alojz, Uni-Lj (Author)
ID Arčon, Iztok, UNG (Author)
ID Kavčič, Anja, Uni-Lj (Author)
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Language:English
Work type:Not categorized
Typology:1.12 - Published Scientific Conference Contribution Abstract
Organization:UNG - University of Nova Gorica
Abstract:Selenium (Se) supplied in inorganic form (as selenate or selenite) was shown to decrease mercury (Hg) toxicity by forming HgSe in soils as well as in animal and human tissues, while for plants there is no evidence of Hg-Se complexation. Although Se in not an essential element for plants it was shown to counteract various abiotic stresses when applied at trace amounts. The aim of this work was therefore to study physiological responses and Hg speciation in plant/ fungi-animal food chain. Lettuce (Lactuca sativa) and porcini mushrooms (Boletus edulis) were taken as model plant/ fungal species and Spanish slug (Arion vulgaris) as a model animal species. The plants, fed to the slugs, were grown in HgCl2 contaminated soil or soil from the vicinity of Hg mine in Idrija with traces of HgS and methyl Hg). Physiological parameters of plants and slugs were monitored during the experiment. At the end the biological material was frozen in LN2 and freeze dried. Hg L3-edge (12284 eV) XANES and EXAFS spectra of the biological samples and standards were measured at liquid helium temperature in fluorescence detection mode at the BM30B beamline of the ESRF synchrotron in Grenoble, using the 30-segment germanium solid state detector [1]. The results showed that addition of Se alleviated Hg toxic effects in the food chain started at HgCl2-contaminated soil, while for the soil from Idrija, containing low amounts of highly toxic methyl-Hg, the beneficial effect was less prominent [2]. No Hg-Se complexes were detected in plants, while in mushrooms and slugs the complexation was confirmed. Addition of Se to the plants, however, changed Hg ligand environment in plant tissues from sulphur to nitrogen ligands. Hg and Se both target the -SH functional groups in the plant tissues, so toxic effects of Hg are rather enhanced than alleviated by addition of Se. Nevertheless, the addition of Se to the plants is beneficial for higher trophic levels and lowers Hg toxicity for the primary consumers, the slugs.
Keywords:mercury, toxicity, ligand environment, XANES, EXAFS, food chain, plant, slug, fungi
Year of publishing:2022
Number of pages:1
PID:20.500.12556/RUNG-7772 New window
COBISS.SI-ID:132217603 New window
NUK URN:URN:SI:UNG:REP:PP5LDRTI
Publication date in RUNG:05.12.2022
Views:1463
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Record is a part of a monograph

Title:Conference programme : EXRS 2022 : 26 June - 1 July
Editors:Koen Janssens
Place of publishing:Bruges, Belgium
Year of publishing:2022
Conference organizer:University of Antwerp, University of Ghent, University of Liege

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