Ecotoxicological assessment and comparison between metal and nano-metal oxides in different aquatic organisms: laboratory surveys.

Brunelli, Giorgia (2017) Ecotoxicological assessment and comparison between metal and nano-metal oxides in different aquatic organisms: laboratory surveys. [Laurea magistrale], Università di Bologna, Corso di Studio in Biologia marina [LM-DM270] - Ravenna, Documento ad accesso riservato.
Documenti full-text disponibili:
[img] Documento PDF (Thesis)
Full-text non accessibile fino al 10 Marzo 2020.
Disponibile con Licenza: Salvo eventuali più ampie autorizzazioni dell'autore, la tesi può essere liberamente consultata e può essere effettuato il salvataggio e la stampa di una copia per fini strettamente personali di studio, di ricerca e di insegnamento, con espresso divieto di qualunque utilizzo direttamente o indirettamente commerciale. Ogni altro diritto sul materiale è riservato

Download (4MB) | Contatta l'autore

Abstract

The increasing production and application of engineered nanomaterials (ENM’s), metal oxides (>100 nm) and nano metal oxides (NPs; size: 1-100 nm) in consumer products over the past decade will inevitably lead to their release into aquatic systems (specially the coastal environment) and thereby cause the exposure to aquatic organisms. Their likely fate in marine systems is sedimentation following hetero-aggregation with natural organic matter, sediment-dwelling and filter feeding organisms most a risk. The aim of this study is understand if the toxicity of metal depends on the size particles, making comparison between metal and nano metal oxides. In this context, the ecotoxicology of four different metal and nano metal oxides (CuO, ZnO, TiO2 and CeO2) on amphipods Ampelisca brevicornis, sea urchin Paracentrotus lividus and clam Ruditapes philippinarum was investigated. These organisms are excellent bioindicators of marine coastal toxicity. The dissolution of nano and no nano metal oxides was evaluated in water and sediment matrices. Biological responses were assessed using biological assays in three marine species: chronic bioassays for A. Brevicornis and R. philippinarum; acute bioassay for P. lividus. Different biological characteristics were assessed in test organisms, survival and bioaccumulation for amphipods; fertilization and embryo-larval development for sea urchins and bioaccumulation in clams, of metal and nano metal oxides in these marine coastal organisms, exposed to increasing concentrations. Acute and chronic effects, associated with the concentrations of metal and metal oxides NPs, were observed. The results show that the metal toxicity is not dependent on the size of particles but appear to be a concentration-dependent factor.

Abstract
Tipologia del documento
Tesi di laurea (Laurea magistrale)
Autore della tesi
Brunelli, Giorgia
Relatore della tesi
Correlatore della tesi
Scuola
Corso di studio
Ordinamento Cds
DM270
Parole chiave
Ecotoxicology, metal oxides, nano metal oxides, bioassays
Data di discussione della Tesi
23 Marzo 2017
URI

Altri metadati

Gestione del documento: Visualizza il documento

^