@article{fdi:010087424,
  title = {{T}rapped microplastics within vertical redeposited sediment : experimental study simulating lake and channeled river systems during resuspension events},
  author = {{C}onstant, {M}. and {A}lary, {C}. and {W}eiss, {L}isa and {C}onstant, {A}. and {B}illon, {G}.},
  editor = {},
  language = {{ENG}},
  abstract = {{P}lastic waste and its fragments (microplastics; <5 mm) have been observed in almost all types of environments. {H}owever, the mechanisms underlying the flow and transport processes of plastics are unknown. {T}his is particularly valid for river sediments, where complex interactions occur between particles and influence their vertical and horizontal distribution patterns. {I}n this study, we investigated the vertical redistribution of 14 pristine microplastics ({MP}s) with different densities, sizes, and shapes within disturbed sediment without lateral transport (i.e., low-velocity flow). {MP}s were spiked into sediments (height: 8 cm) in a column with a height of 1 m (diameter: 6 cm) filled to the top with water. {T}he sediment was perturbed by turning the column upside-down to simulate remobilization and the subsequent deposition of sediment. {A}fter the complete sedimentation of the particles, the water column was filtered and the sediment was cut into vertical sections. {MP}s were then extracted from the sediment using sieves and a density separation method, and were counted under a stereomicroscope. {L}ow-density polymers were mainly recovered in the water column and at the surface of the sediment, whereas high-density polymers were found within all sediment sections. {T}he vertical distribution of high-density polymers changes primarily with the sediment grain size. {T}he distribution of each polymer type changes depending on the size and/or shape of the particles with complex interactions. {T}he observed distributions were compared with the expected distributions based only on the vertical velocity formulas. {O}verall, the formulas used did not explain the sedimentation of a portion of low-density polymers and predicted a lower distribution in the sediment than those observed in the experiment. {I}n conclusion, this study highlights the importance of considering {MP}s as multi-dimensional particles and provides clues to understand their fate in low-velocity flow systems, considering that they undergo scavenging in sediments.},
  keywords = {{M}icroplastics ; {R}iver sediments ; {L}ow-velocity flow ; {D}eposition ; {S}ettling velocity},
  booktitle = {},
  journal = {{E}nvironmental {P}ollution},
  volume = {322},
  numero = {},
  pages = {121212 [9 p.]},
  ISSN = {0269-7491},
  year = {2023},
  DOI = {10.1016/j.envpol.2023.121212},
  URL = {https://www.documentation.ird.fr/hor/fdi:010087424},
}