Acute ecotoxicological effects of Hg(CN) 2 in Danio rerio (zebrafish).

Autor: da Silva HAM; Laboratório de Traçadores em Ciências Ambientais Wolfgang Christian Pfeiffer, IBCCF, Universidade Federal do Rio de Janeiro, Av. Carlos Chagas Filho 373, CEP 21941-902, Rio de Janeiro, RJ, Brazil. henrique.alencar33@gmail.com., Kasper D; Laboratório de Traçadores em Ciências Ambientais Wolfgang Christian Pfeiffer, IBCCF, Universidade Federal do Rio de Janeiro, Av. Carlos Chagas Filho 373, CEP 21941-902, Rio de Janeiro, RJ, Brazil., Marshall BG; Norman B. Keevil Institute of Mining Engineering, University of British Columbia, Vancouver, BC, Canada., Veiga MM; Norman B. Keevil Institute of Mining Engineering, University of British Columbia, Vancouver, BC, Canada., Guimaraes JRD; Laboratório de Traçadores em Ciências Ambientais Wolfgang Christian Pfeiffer, IBCCF, Universidade Federal do Rio de Janeiro, Av. Carlos Chagas Filho 373, CEP 21941-902, Rio de Janeiro, RJ, Brazil.
Jazyk: angličtina
Zdroj: Ecotoxicology (London, England) [Ecotoxicology] 2023 May; Vol. 32 (4), pp. 429-437. Date of Electronic Publication: 2023 Apr 13.
DOI: 10.1007/s10646-023-02651-w
Abstrakt: Artisanal and small-scale gold mining (ASGM) is the largest source of anthropogenic Hg emissions on the planet. In addition, Hg-contaminated tailings are often reprocessed with sodium cyanide (NaCN) to extract the residual gold remaining in the material. This leads to the formation of mercury cyanide (Hg(CN) 2 ) complexes, which are often discharged in untreated form into local drainages, leading to large amounts of free cyanide being released. However, data on mercury-cyanide interactions are scarce. In this study, we investigated the impact of cyanide and Hg bioavailability in zebrafish when added as Hg(CN) 2 . Different concentrations of Hg(CN) 2 and NaCN were used, leading to an LC 50 of 0.53 mg.L -1 for NaCN and 0.16 mg.L -1 for Hg(CN) 2 . Analyzing free cyanide concentrations in aquarium water, >40% dissociation was observed for NaCN and about 5% for Hg(CN) 2 . The accumulation of total Hg (THg) in the brain, gills, muscle and kidney was quantified. All fish exposed to Hg(CN) 2 had higher THg levels than their controls and kidney was the tissue with higher Hg(CN) 2 accumulation. Histological effects on the kidney and gills of both cyanides in D. rerio tissues were investigated, suggesting renal alterations in fish exposed to Hg(CN) 2 and showing hyperplasia in the gills of animals exposed to NaCN and Hg(CN) 2 . The results alert to the risks of the presence of these complexes in aquatic environments.
(© 2023. The Author(s), under exclusive licence to Springer Science+Business Media, LLC, part of Springer Nature.)
Databáze: MEDLINE
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