%0 Journal Article
%9 ACL : Articles dans des revues avec comité de lecture répertoriées par l'AERES
%A Vignardi, C. P.
%A Adeleye, A. S.
%A Kayal, Mohsen
%A Oranu, E.
%A Miller, R. J.
%A Keller, A. A.
%A Holden, P. A.
%A Lenihan, H. S.
%T Aging of copper nanoparticles in the marine environment regulates toxicity for a coastal phytoplankton species
%D 2023
%L fdi:010087714
%G ENG
%J Environmental Science and Technology
%@ 0013-936X
%K engineered nanomaterials ; environmental conditions ; aging ; copper ; nanoparticles ; marine phytoplankton ; ecotoxicity
%M ISI:000982557500001
%N 17
%P 6989-6998
%R 10.1021/acs.est.2c07953
%U https://www.documentation.ird.fr/hor/fdi:010087714
%> https://www.documentation.ird.fr/intranet/publi/2023-06/010087714.pdf
%V 57
%W Horizon (IRD)
%X Environmental conditions in aquatic ecosystems transform toxic chemicals over time, influencing their bioavailability and toxicity. Using an environmentally relevant methodology, we tested how exposure to seawater for 1-15 weeks influenced the accumulation and toxicity of copper nanoparticles (nano-Cu) in a marine phytoplankton species. Nano-Cu rapidly agglomerated in seawater and then decreased in size due to Cu dissolution. Dissolution rates declined during weeks 1-4 and remained low until 15 weeks, when the large agglomerates that had formed began to rapidly dissolve again. Marine phytoplankton species were exposed for 5-day periods to nano-Cu aged from 1 to 15 weeks at concentrations from 0.01 to 20 ppm. Toxicity to phytoplankton, measured as change in population growth rate, decreased significantly with particle aging from 0 to 4 weeks but increased substantially in the 15-week treatment due apparently to elevated Cu dissolution of reagglomerated particles. Results indicate that the transformation, fate, and toxicity of nano-Cu in marine ecosystems are influenced by a highly dynamic physicochemical aging process.
%$ 038 ; 021 ; 034