Abstract:
:The acute toxicity of citrate capped silver nanoparticles (AgNP) and silver nitrate was evaluated on the marine macroalga Ulva rigida C. Agardh (1823). Silver bioaccumulation, ultrastructural chloroplast damages verified by TEM microscopy, inhibition of primary production, neutral lipid production and oxidative stress were observed after 24 h of exposure to AgNP. The toxic effects of silver nitrate in artificial seawater started from a concentration of 0.05 ppm and was more toxic than AgNP that produced effects from a concentration of 0.1 ppm. However only AgNP induced lipid peroxidation in U. rigida. The addition of natural organic and inorganic ligands, represented by transparent exopolymer particles (TEP) and clay, drastically reduced AgNP acute toxicity in a ratio AgNP:ligand of 1:100 and 1:200, respectively. The findings suggest a marked toxicity of Ag on marine macroalgae which however should be mitigated by the high natural ligand concentrations of the transitional environments.
journal_name
Environ Intjournal_title
Environment internationalauthors
Sfriso AA,Mistri M,Munari C,Moro I,Wahsha M,Sfriso A,Juhmani ASdoi
10.1016/j.envint.2019.104942subject
Has Abstractpub_date
2019-10-01 00:00:00pages
104942eissn
0160-4120issn
1873-6750pii
S0160-4120(18)33048-4journal_volume
131pub_type
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