Scheda di dettaglio – i prodotti della ricerca
| Dato | Valore |
|---|---|
| Title | Mercury bioavailability in fluvial sediments estimated using chironomus riparius and diffusive gradients in thin-films (Dgt) |
| Abstract | Mercury bioavailability was assessed by exposing the dipteran Chironomus riparius for the whole life cycle to legacy-contaminated fluvial sediments (0.038-0.285 mg Hg kg d.w.) and analyzing tissue concentrations in larvae at different exposure times (7, 11, and 16 days) and in adults. In the same experiment, diffusive gradients in thin-film passive samplers (DGTs), both piston-and probe-shaped, were co-deployed in the same sediments and retrieved at the same times as the organisms. To compare the two approaches, results showed a good agreement between accumulation kinetics of C. riparius and DGTs, both approximating an apparent steady-state. A strong correlation was found between values in tissues and in both types of DGTs (r between 0.74 and 0.99). Concentrations in mature larvae (19-140 µg kg w.w.), which may represent a basal level of the aquatic food web, exceeded the European Environmental Quality Standard for biota (20 µg kg w.w.), which aims at protecting the top predators from secondary poisoning. Body burdens in larvae and in adults were similar, showing negligible decontamination during metamorphosis and proving an efficient mercury transfer from sediments to terrestrial food webs. |
| Source | Environments (Basel) 8, pp. 1–13 |
| Keywords | mercurysediment contaminationpassive samplersbenthic invertebrates |
| Journal | Environments (Basel) |
| Editor | MDPI, Basel, Svizzera |
| Year | 2021 |
| Type | Articolo in rivista |
| DOI | 10.3390/environments8020007 |
| Authors | Marziali L.; Valsecchi L. |
| Text | 446661 2021 10.3390/environments8020007 Scopus 2 s2.0 85101093722 mercury sediment contamination passive samplers benthic invertebrates Mercury bioavailability in fluvial sediments estimated using chironomus riparius and diffusive gradients in thin films Dgt Marziali L.; Valsecchi L. CNR IRSA Water Research Institute, National Research Council, Via del Mulino 19, Brugherio, MB, 20861, CNR IRSA Water Research Institute, National Research Council, Via del Mulino 19, 20861, Brugherio, MB, Italy, , Italy Mercury bioavailability was assessed by exposing the dipteran Chironomus riparius for the whole life cycle to legacy contaminated fluvial sediments 0.038 0.285 mg Hg kg d.w. and analyzing tissue concentrations in larvae at different exposure times 7, 11, and 16 days and in adults. In the same experiment, diffusive gradients in thin film passive samplers DGTs , both piston and probe shaped, were co deployed in the same sediments and retrieved at the same times as the organisms. To compare the two approaches, results showed a good agreement between accumulation kinetics of C. riparius and DGTs, both approximating an apparent steady state. A strong correlation was found between values in tissues and in both types of DGTs r between 0.74 and 0.99 . Concentrations in mature larvae 19 140 µg kg w.w. , which may represent a basal level of the aquatic food web, exceeded the European Environmental Quality Standard for biota 20 µg kg w.w. , which aims at protecting the top predators from secondary poisoning. Body burdens in larvae and in adults were similar, showing negligible decontamination during metamorphosis and proving an efficient mercury transfer from sediments to terrestrial food webs. 8 Published version http //www.scopus.com/record/display.url eid=2 s2.0 85101093722 origin=inward Articolo in rivista MDPI 2076 3298 Environments Basel Environments Basel Environments Environments Basel lucia.valsecchi VALSECCHI LUCIA laura.marziali MARZIALI LAURA DTA.AD002.129.001 LAGO MAGGIORE BRUGHERIO |