Silver Bioaccumulation Dynamics in a Freshwater Invertebrate after Aqueous and Dietary Exposures to Nanosized and Ionic Ag

We compared silver (Ag) bioavailability and toxicity to a freshwater gastropod after exposure to ionic silver (Ag+) and to Ag nanoparticles (Ag NPs) capped with citrate or with humic acid. Silver form, exposure route, and capping agent influence Ag bioaccumulation dynamics in Lymnaea stagnalis. Snai...

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Bibliographic Details
Published in:Environmental science & technology 2011-08, Vol.45 (15), p.6600-6607
Main Authors: Croteau, Marie-Noële, Misra, Superb K, Luoma, Samuel N, Valsami-Jones, Eugenia
Format: Article
Language:English
Subjects:
Animal and plant ecology
Animal, plant and microbial ecology
Animals
Applied ecology
Autoecology
Bacillariophyceae
Bioaccumulation
Biological and medical sciences
Diatoms - ultrastructure
Diet
Ecotoxicology and Human Environmental Health
Ecotoxicology, biological effects of pollution
Environmental Exposure - analysis
Environmental Monitoring
Food
Fresh Water
Fresh water ecosystems
Freshwater
Fundamental and applied biological sciences. Psychology
Gastropoda
General aspects
Invertebrata
Ions
Lymnaea - metabolism
Lymnaea stagnalis
Metal Nanoparticles - chemistry
Mollusks
Nanoparticles
Particle Size
Plankton
Risk assessment
Silver
Silver - metabolism
Solutions
Synecology
Time Factors
Toxicity
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Summary:We compared silver (Ag) bioavailability and toxicity to a freshwater gastropod after exposure to ionic silver (Ag+) and to Ag nanoparticles (Ag NPs) capped with citrate or with humic acid. Silver form, exposure route, and capping agent influence Ag bioaccumulation dynamics in Lymnaea stagnalis. Snails efficiently accumulated Ag from all forms after either aqueous or dietary exposure. For both exposure routes, uptake rates were faster for Ag+ than for Ag NPs. Snails efficiently assimilated Ag from Ag NPs mixed with diatoms (assimilation efficiency (AE) ranged from 49 to 58%) and from diatoms pre-exposed to Ag+ (AE of 73%). In the diet, Ag NPs damaged digestion. Snails ate less and inefficiently processed the ingested food, which adversely impacted their growth. Loss rates of Ag were faster after waterborne exposure to Ag NPs than after exposure to dissolved Ag+. Once Ag was taken up from diet, whether from Ag+ or Ag NPs, Ag was lost extremely slowly. Large Ag body concentrations are thus expected in L. stagnalis after dietborne exposures, especially to citrate-capped Ag NPs. Ingestion of Ag associated with particulate materials appears as the most important vector of uptake. Nanosilver exposure from food might trigger important environmental risks.
ISSN:0013-936X
1520-5851
DOI:10.1021/es200880c