Can Sediments Contaminated by Mining be a Source of Mercury in the Coastal Environment Due to Dredging? Evidence from Thermo-Desorption and Chemical Speciation.
Bioavailability
Chemical speciation
Dredging
Mercury
Sediments
Journal
Bulletin of environmental contamination and toxicology
ISSN: 1432-0800
Titre abrégé: Bull Environ Contam Toxicol
Pays: United States
ID NLM: 0046021
Informations de publication
Date de publication:
Jun 2021
Jun 2021
Historique:
received:
06
11
2020
accepted:
15
02
2021
pubmed:
4
3
2021
medline:
1
7
2021
entrez:
3
3
2021
Statut:
ppublish
Résumé
The sediments in the Gulf of Trieste (northern Adriatic Sea, Italy) are contaminated by mercury (Hg) due to historic mining which took place in Idrija (Slovenia). Despite many studies having been done regarding Hg, no information is available on the potential impact of dredging required along the main channel approaching the Port of Monfalcone. Sixteen surface sediment samples were collected along the channel to determine both total Hg concentration and chemical species using the thermo-desorption (TD) technique. Six samples were also chosen to apply a selective sequential extraction (SSE). The TD technique showed the maximum Hg release approximately at 260 and 335°C, corresponding to metacinnabar (β-HgS) and cinnabar (α-HgS), respectively. The SSE demonstrated that Hg was mainly associated with poorly soluble or insoluble compounds (98.7%). A resuspension event over a limited period of time can be considered of negligible impact to the water column due to the scarce Hg mobility from sediments.
Identifiants
pubmed: 33655405
doi: 10.1007/s00128-021-03159-x
pii: 10.1007/s00128-021-03159-x
pmc: PMC8238728
doi:
Substances chimiques
Water Pollutants, Chemical
0
Mercury
FXS1BY2PGL
Types de publication
Journal Article
Langues
eng
Sous-ensembles de citation
IM
Pagination
942-948Références
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