Geochronology of anthropogenic radionuclides in Ribeira Bay sediments, Rio de Janeiro, Brazil

Gomes, Franciane de Carvalho; Godoy, José Marcus; Godoy, Maria Luiza D.P.; Carvalho, Zenildo Lara de; Lopes, Ricardo Tadeu; Sanchez-Cabeza, Joan-Albert; Osvath, I.; Lacerda, Luiz Drude de

doi:10.1016/j.jenvrad.2011.04.013

Cited by 8 publications

(1 citation statement)

References 17 publications

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“…Lead-210 ( 210 Pb) and total organic carbon (TOC) data are provided in Table S4 and in Figures S4 and S5. 210 Pb was measured in the 2010 Lake Duas Bocas sediment core at the Pontifícia Universidade Católica do Rio de Janeiro according to the methods described in refs and . A total of 5 g of material from each 2 cm section of sediment core was sequentially leached in 50 mL of 0.5 M HBr for 2 h at 80 °C followed by 50 mL of 0.5 M HBr and 1.0 g of NH 2 OH-HCl for 2 h at 80 °C.…”

Section: Methodsmentioning

confidence: 99%

Mercury Pollution in Amapá, Brazil: Mercury Amalgamation in Artisanal and Small-Scale Gold Mining or Land-Cover and Land-Use Changes?

Miserendino

Guimarães

Schudel

et al. 2017

ACS Earth Space Chem.

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Mercury (Hg) poses a public health burden in the Amazon and worldwide. Although usually attributed to Hg used in artisanal and small-scale gold mining (ASGM), the primary source of elevated Hg in Amazonian aquatic ecosystems is contested since there have not been tools to differentiate between Hg from ASGM and Hg from other sources such as increased soil erosion associated with landcover and land-use change. To directly assess Hg contamination from ASGM, stable Hg isotope analyses were applied to sediment cores, surface sediments, and soils from two aquatic ecosystems in Amapa, Brazil, one downstream of ASGM activities and one isolated from ASGM. Downstream of the ASGM sites, the Hg isotope data is consistent with elevated Hg coming dominantly from increased erosion of soils and not from Hg used during gold extraction. Although these two sources represent different pathways of contamination to downstream ecosystems, ASGM may contribute to both land-cover and land-use change and local contamination of soils. Accordingly, these findings demonstrate that in some regions of the Amazon effective Hg mitigation strategies need to address land-use practices in addition to ASGM.

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Section: Methodsmentioning

confidence: 99%