@article{fdi:010090727,
  title = {{A}dapted sequential extraction protocol to study mercury speciation in gold mining tailings : implications for environmental contamination in the {A}mazon},
  author = {de {S}ouza, {J}. {P}. {R}. and {G}arnier, {J}. and {Q}uintarelli, {J}. {M}. and {T}onhá, {M}. {D}. and {R}oig, {H}. {L}. and {S}eyler, {P}atrick and de {S}ouza, {J}. {R}.},
  editor = {},
  language = {{ENG}},
  abstract = {{A}rtisanal small-scale gold mining ({ASGM}), an increasingly prevalent activity in {S}outh {A}merica, generates mercury-contaminated tailings that are often disposed of in the environment, leading to the introduction of mercury into ecosystems and the food web, where it bioaccumulates. {T}herefore, studying the geochemical processes involved in the desorption and dissolution of mercury in these tailings is essential for critical risk evaluations in the short and long term. {F}or this purpose, sequential extraction procedures ({SEP}s) can be useful because they help to identify the phases to which {H}g is associated, although they also have limitations such as a lack of selectivity and specificity. {I}n this work, we propose a modified four-step {SEP}: exchangeable mercury ({F}1), oxidizable mercury ({F}2), mercury bound to {F}e oxides ({F}3), and strongly bound mercury ({F}4). {T}o test this adapted sequential extraction method, we evaluated the {H}g contamination in mercury-contaminated tailings of the {A}mazon basin. {T}he results revealed a total mercury concentration of 103 +/- 16 mg<middle dot>kg-1 in the tailings, with a significant portion in {F}1 (28% of the total), where {H}g was bioavailable. {T}he large {H}g concentration in {F}3 (36%) suggested that {F}e oxides likely contribute to mercury retention. {T}ogether, the {SEP} results emphasize the urgent need for improved surveillance of gold mining activities and responsible tailings management practices to mitigate environmental contamination and safeguard the health of the {A}mazon ecosystem.},
  keywords = {mercury ; speciation ; {ASGM} ; tailings ; sequential extraction procedure ; {A}mazon ; {BRESIL} ; {AMAZONIE} ; {MADEIRA} {COURS} {D}'{EAU} ; {AMAZONE} {COURS} {D}'{EAU}},
  booktitle = {},
  journal = {{T}oxics},
  volume = {12},
  numero = {5},
  pages = {326 [14 ]},
  year = {2024},
  DOI = {10.3390/toxics12050326},
  URL = {https://www.documentation.ird.fr/hor/fdi:010090727},
}