@article{fdi:010083929,
  title = {{S}election of a density separation solution to study microplastics in tropical riverine sediment},
  author = {{D}uong, {T}. {T}. and {L}e, {P}. {T}. and {N}guyen, {T}. {N}. {H}. and {H}oang, {T}. {Q}. and {N}go, {H}. and {D}oan, {T}. {O}. and {L}e, {T}. {P}. {Q}. and {B}ui, {H}. {T}. and {B}ui, {M}. {H}. and {T}rinh, {V}. {T}. and {N}guyen, {T}. {L}. and {D}a {L}e, {N}. and {V}u, {T}. {M}. and {T}ran, {T}. {K}. {C}. and {H}o, {T}. {C}. and {P}huong, {N}. {N}. and {S}trady, {E}milie},
  editor = {},
  language = {{ENG}},
  abstract = {{M}icroplastics ({MP}s) are small (< 5 mm) plastic particles that are widely found in marine, freshwater, terrestrial and atmospheric environments. {D}ue to their prevalence and persistence, {MP}s are considered an emerging contaminant of environmental concern. {T}he separation and quantitation of {MP}s from freshwater sediments is a challenging and critical issue. {I}t is necessary to identify the fate and sources of {MP}s in the environment, minimise their release and adverse effects. {C}ompared to marine sediments, standardised methods for extracting and estimating the amount of {MP}s in freshwater sediments are relatively limited. {T}he present study focuses on {MP} recovery efficiency of four commonly used salt solutions ({N}a{C}l, {N}a{I}, {C}a{C}l2 and {Z}n{C}l2) for isolating {MP}s during the density separation step from freshwater sediment. {K}nown combinations of artificial {MP} particles ({PS}, {PE}, {PVC}, {PET}, {PP} and {HDPE}) were spiked into standard river sediment. {E}xtraction using {N}a{I}, {Z}n{C}l2 and {N}a{C}l solutions resulted in higher recovery rates from 37 to 97% compared to the {C}a{C}l2 solution (28-83%) and varied between polymer types. {L}ow-density {MP}s ({PE}, {HDPE}, {PP} and {PS}) were more effectively recovered (> 87%) than the denser polymers ({PET} and {PVC}: 37 to 88.8%) using {N}a{C}l, {N}a{I} and {Z}n{C}l2 solutions. {H}owever, the effective flotation of {Z}n{C}l2 and {N}a{I} solutions is relatively expensive and unsafe to the environment, especially in the context of developing countries. {T}herefore, considering the efficiency, cost and environmental criteria, {N}a{C}l solution was selected. {T}he protocol was then tested by extracting {MP}s from nine riverine sediment samples from the {R}ed {R}iver {D}elta. {S}ediments collected from urban rivers were highly polluted by {MP}s (26,000 {MP}s items center dot kg(-1) {DW}) compared to sediments located downstream. {U}sing a {N}a{C}l solution was found to be effective in this case study and might also be used in long-term and large-scale {MP} monitoring programmes in {V}ietnam.},
  keywords = {{M}icroplastics ; {D}ensity separation ; {R}iverine sediment ; {U}rban rivers ; {V}ietnam ; {VIET} {NAM} ; {ZONE} {TROPICALE} ; {FLEUVE} {ROUGE}},
  booktitle = {},
  journal = {{E}nvironmental {M}onitoring and {A}ssessment},
  volume = {194},
  numero = {2},
  pages = {65 [17 p.]},
  ISSN = {0167-6369},
  year = {2022},
  DOI = {10.1007/s10661-021-09664-0},
  URL = {https://www.documentation.ird.fr/hor/fdi:010083929},
}