John Wiley & Sons, Ltd.

Comparing the effects of nano silver size and coating variations on bioavailability, internalization, and elimination, using Lumbriculus variegatus

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As the production and applications of nano silver (nano Ag) increase, it is essential to characterize fate and effects in environmental systems. Nano Ag materials may settle from suspension, therefore, our objective was to utilize environmentally relevant bioassays and study the impact, bioaccumulation, tissue distribution, uptake and depuration of nano Ag on a sediment‐dwelling invertebrate, Lumbriculus variegatus. Hydrodynamic diameters of uncoated 30, 80, 1500 nm nano Ag powders and a polyvinylpyrrolidone (PVP) nano Ag suspension, were measured utilizing dynamic light scattering in freshwater media (0–280 µS/cm). Aggregation for 30, 80, and 1500 nm silver increased with conductivity; however, was minimal for PVP silver. Lumbriculus variegatus were exposed to nano Ag or silver nitrate (AgNO3) spiked into sediment (nominally 100 mg/kg) and water (PVP 30 and 70 nm Ag, nominally 5 mg/L). Uptake was assessed through inductively coupled plasma mass spectroscopy (ICP‐MS) and hyperspectral imaging. Particle sizes were examined through field flow fractionation‐ICP‐MS (FFF‐ICP‐MS) and ICP‐MS in single particle mode (spICP‐MS). Lumbriculus variegatus were also depurated for 6, 8, 24, and 48 hours to determine gut‐clearance. Bioaccumulation factors of sediment‐exposed L. variegatus were similar regardless of particle size/coatings. The FFF‐ICP‐MS and spICP‐MS detected nano Ag up to 48 hours post depuration. The present study provides information on bioaccumulation and interactions of nano Ag particles within biological systems. Environ Toxicol Chem © 2013 SETAC

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