The geochemical behaviour of lanthanides and yttrium(Rare Earth Elements, REEs) has been investigatedmainlyin geological systems where these elements represent the best proxies of processes involving the occurrence ofan interface between different media. This behaviour is assessed according to features recorded in sequences ofREE concentrations along the REE series normalised with respect to a reference material. In this study, thegeochemical behaviour of REE was investigated in different parts of Vitis vinifera specimens grown off-soil, onsoils of different nature and grafted onto several rootstocks in order to evaluate effects induced by these changes.The results indicated that roots are the plant organs where REEs are preferentially concentrated, in particularelements from Sm to Ho (middle REE, MREE) whereas Eu enrichments occur in aerial parts. The geochemicalbehaviour of REE suggests that MREE enrichments in roots are due to preferential MREE interactions withbiological membranes or to surface complexation with newly formed phosphates. Eu-positive anomalies suggestthat Eu3+ can form stable organic complexes in place of Ca2+ in several biological processes in xylem fluids.The possibility that Eu mobility in these fluids can be enhanced by its reductive speciation as Eu2+ cannot beruled out.The assessment of the geochemical behaviour of REE according to the theory of the Tetrad Effect carried outconfirms that REEs coming fromsoil are scavenged onto root tissues or mineral surfaceswhereas their behaviourin aerial parts of V. vinifera is driven by dissolved complexation.
|Numero di pagine||12|
|Rivista||Science of the Total Environment|
|Stato di pubblicazione||Published - 2014|
All Science Journal Classification (ASJC) codes
- Environmental Engineering
- Environmental Chemistry
- Waste Management and Disposal