Water Chemistry, Exposure Routes, and Metal Forms Determine the Bioaccumulation Dynamics of Silver (Ionic and Nanoparticulate) in Daphnia magna

Authors

Emma Lesser, Smith College
Fatima Noor Sheikh, Smith College
Mithun Sikder, Smith College
Marie Noële Croteau, United States Geological Survey Western Region
Natasha Franklin, United States Geological Survey Western Region
Mohammed Baalousha, University of South Carolina
Niveen S. Ismail, Smith CollegeFollow

Document Type

Article

Publication Date

3-1-2022

Publication Title

Environmental Toxicology and Chemistry

Abstract

Treatment wetlands utilize various physical and biological processes to reduce levels of organic contaminants, metals, bacteria, and suspended solids. Silver nanoparticles (AgNPs) are one type of contaminant that can enter treatment wetlands and impact the overall treatment efficacy. Grazing by filter-feeding zooplankton, such as Daphnia magna, is critical to treatment wetland functioning; but the effects of AgNPs on zooplankton are not fully understood, especially at environmentally relevant concentrations. We characterized the bioaccumulation kinetics of dissolved and nanoparticulate (citrate-coated) 109Ag in D. magna exposed to environmentally relevant 109Ag concentrations (i.e., 0.2–23 nmol L−1 Ag) using a stable isotope as a tracer of Ag. Both aqueous and nanoparticulate forms of 109Ag were bioavailable to D. magna after exposure. Water chemistry affected 109Ag influx from 109AgNP but not from 109AgNO3. Silver retention was greater for citrate-coated 109AgNP than dissolved 109Ag, indicating a greater potential for bioaccumulation from nanoparticulate Ag. Feeding inhibition was observed at higher dietary 109Ag concentrations, which could lead to reduced treatment wetland performance. Our results illustrate the importance of using environmentally relevant concentrations and media compositions when predicting Ag bioaccumulation and provide insight into potential effects on filter feeders critical to the function of treatment wetlands.

Keywords

Bioavailability, Biodynamic model, Daphnia magna, Metal accumulation, Nanoparticles, Zooplankton

Volume

41

Issue

3

First Page

726

Last Page

738

DOI

10.1002/etc.5271

ISSN

07307268

Comments

Archived as published.

Recommended Citation

Lesser, Emma; Sheikh, Fatima Noor; Sikder, Mithun; Croteau, Marie Noële; Franklin, Natasha; Baalousha, Mohammed; and Ismail, Niveen S., "Water Chemistry, Exposure Routes, and Metal Forms Determine the Bioaccumulation Dynamics of Silver (Ionic and Nanoparticulate) in Daphnia magna" (2022). Engineering: Faculty Publications, Smith College, Northampton, MA.
https://scholarworks.smith.edu/egr_facpubs/106