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SUMMARY:BIOACCUMULATION AND PHYTOTOXICITY OF IONIC RARE EARTH ELEMENTS (CE
 RIUM\, NEODYMIUM\, SAMARIUM) IN LEMNA GIBBA
DTSTART;VALUE=DATE-TIME:20261001T124500Z
DTEND;VALUE=DATE-TIME:20261001T130000Z
DTSTAMP;VALUE=DATE-TIME:20260915T223808Z
UID:indico-contribution-2931@cern.ch
DESCRIPTION:Speakers: Gergő Koleszár (University of Nyiregyhaza)\nRare e
 arth elements (REEs) are increasingly used in modern technologies\, raisin
 g concerns about their release into aquatic environments and subsequent tr
 ansfer through food webs. This study investigated the response of the floa
 ting macrophyte Lemna gibba to three ionic REEs (Ce\, Nd\, and Sm)\, focus
 ing on phytotoxicity\, uptake\, and bioaccumulation. Plants were exposed t
 o contaminated water for eight days\, during which REE concentrations in t
 he growth medium and plant biomass were monitored to establish a complete 
 mass balance. The highest non-toxic concentrations were 0.8 mg L⁻¹ for 
 Ce\, 1.8 mg L⁻¹ for Nd\, and 7.7 mg L⁻¹ for Sm\, whereas 50% inhibit
 ion of relative growth rate occurred at 2.0\, 2.4\, and 13.3 mg L⁻¹\, r
 espectively. Elevated phosphate concentration markedly reduced the toxicit
 y of all investigated REEs. Among the six physiological parameters evaluat
 ed\, total chlorophyll content proved to be the most sensitive indicator o
 f REE-induced stress. The removal efficiency of dissolved REEs reached 94
 –96%. However\, only 30–55% of the initial REE load accumulated in pla
 nt tissues\, while the remainder was attributed to precipitation. Bioconce
 ntration factors were 460 for Ce\, 774 for Nd\, and 419 for Sm. Neodymium 
 showed the highest accumulation (3579 mg kg⁻¹ dry biomass). These resul
 ts demonstrate that Lemna gibba efficiently removes ionic REEs from contam
 inated water. Nevertheless\, the considerable accumulation of REEs in plan
 t tissues suggests a potential route for their transfer into aquatic food 
 webs\, highlighting the ecological risks associated with increasing enviro
 nmental REE contamination.\n\nhttps://indico.unina.it/event/117/contributi
 ons/2931/
LOCATION:Department of Agricultural Sciences of the University of Napoli F
 ederico II\, Portici\, Italy Sala Cinese
URL:https://indico.unina.it/event/117/contributions/2931/
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