Metal transfer to sediments, invertebrates and fish following waterborne exposure to silver nitrate or silver sulfide nanoparticles in an indoor stream mesocosm

• DOI: 10.1016/j.scitotenv.2022.157912
• Publication Date: 2022-08-08T21:07:33Z
• Authors: Nathaniel Clark; Joanne Vassallo; Patrícia V. Silva; Ana Rita R. Silva; Marta Baccaro; Neja Medvešček; Magdalena Grgić; Abel Ferreira; Martí Busquets-Fité; Kerstin Jurkschat; Anastasios G. Pap...; Victor Puntes; Iseult Lynch; Claus Svendsen; Nico W. van den B...; Cornelis A.M. van...; Susana Loureiro; Richard D. Handy
• Keywords: Mesocosm; Chironomus riparius; Silver nanoparticle; Bioconcentration; Silver nitrate; Daphnia magna; Biota; Ecotoxicity

The fate of engineered nanomaterials in ecosystems is unclear. An aquatic stream mesocosm explored the and bioaccumulation silver sulfide nanoparticles (Ag2S NPs) compared to nitrate (AgNO3). aims were determine total Ag water, sediment biota, evaluate bioavailable fractions using a serial extraction method. water column from nominal daily dose 10 μg L-1 for AgNO3 or Ag2S NP treatments reached plateau around 13 12 L-1, respectively, by end study. Similarly, both Ag-treatments ~380 kg-1, with most it being acid-extractable/labile. biota accumulated 4-59 g-1 dw, depending on type Ag-treatment organism. oligochaete worm, Lumbriculus variegatus, exposure over time, which was similar treatment experiment. planarian, Girardia tigrina, chironomid larva, Chironomus riparius, showed much higher concentrations than worms; clearer time-dependent statistically significant accumulation relative untreated controls. For pulmonate snail, Physa acuta, exposures observed, but lower nano treatment. caused appreciable flea, Daphnia magna, (reaching 59 dw). In rainbow trout, Oncorhynchus mykiss, AgNO3, not NPs, increase tissues. Overall, study transfer sediment, generally less that AgNO3.