Uptake and Retention of Nanoplastics in Quagga Mussels

Global Challenges
Rachel L MerzelMark M Banaszak Holl

Abstract

Here, a set of experiments to assess the feasibility of using an invasive and widespread freshwater mussel (Dreissena rostrformis bugensis) as a sentinel species for nanoplastic detection is reported. Under laboratory experimental conditions, mussels ingest and retain fluorescent polystyrene (PS) beads with carboxylic acid (-COOH) termination over a size range of 200-2000 nm. The number of beads the mussels ingested is quantified using fluorescence spectroscopy and the location of the beads in the mussels is imaged using fluorescence microscopy. PS beads of similar size (1000-2000 nm) to mussels' preferred food are trafficked in the ciliated food grooves of the gills. Beads of all sizes are observed in the mussels' digestive tracts, indicating that the mussels do not efficiently reject the beads as unwanted foreign material, regardless of size. Fluorescence microscopy shows all sizes of beads are concentrated in the siphons and are retained there for longer than one month postexposure. Combined atomic force microscopy-infrared spectroscopy and photothermal infrared spectroscopy are used to locate, image, and chemically identify the beads in the mussel siphons. In sum, these experiments demonstrate the potential for using mussel...Continue Reading

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Citations

Jan 2, 2021·Advances in Colloid and Interface Science·Shinji KiharaDuncan J McGillivray

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Methods Mentioned

BETA
infrared spectroscopy
electron microscopy
fluorescence microscopy
fluorescence spectroscopy
Fluorescence
dissection
Atomic Force
AFM
the

Software Mentioned

ImageJ

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