Changes in lead and mercury atmospheric deposition due to industrial emissions in Southeastern Brazil

Lacerda, Luiz Drude de; Ribeiro, Mario G.

doi:10.1590/s0103-50532004000600022

Cited by 20 publications

(7 citation statements)

References 27 publications

(51 reference statements)

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“…Furthermore, the presence of higher metal content in upper layers of the sediment core suggests that this lagoon may also have been affected by recent anthropogenic sources of trace metals. Atmospheric deposition, especially from industrial areas, can be an important source of metal contamination in coastal areas in Southeast of Brazil (Lacerda et al 2002;Lacerda and Ribeiro 2004). As there are no other industrial or urban sources in the vicinity, it may have been possible that the prevailing NE winds have transported metals released by the induration furnaces from the pelletizing plant to Guanabara Lagoon, which was previously assumed to be an undisturbed reference location.…”

Section: Sediment Normalizationmentioning

confidence: 99%

Effects of iron-ore mining and processing on metal bioavailability in a tropical coastal lagoon

et al. 2008

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Background, aim, and scope In water systems, water quality and geochemical properties of sediments determine the speciation of trace metals, metal transport, and sediment-water exchange, influencing metal availability and its potential effects on biota. Studies from temperate climates have shown that iron-ore mining and tailing wastewaters, besides being a source of trace metals, usually show high levels of dissolved ions and particulate suspended matter, thus having the potential of indirectly changing metal bioavailability. For the first time in the tropics, we identified the effects of iron-ore mining and processing on metal bioavailability in a coastal lagoon. With an extensive sampling scheme, we investigated the potential sources of metals; the links among metal levels in water, sediments, and invertebrates; and the contrasting effects on metal speciation and bioavailability. Methodology The metals Fe, Mn, Al, Cr, Zn, Cu, Ni, Pb, Cd, Hg, and As were measured in water, sediments (surface and profiles), and invertebrates from Mãe-Bá Lagoon and in the sites directly influenced by the mining operations (tailing dams and nearby rivers). In addition, samples from two other lagoons, considered pristine, were analyzed. The study area is located in the southeast of Brazil (Iron Quadrangle Region and a coastal area of Espírito Santo State). General water characteristics included pH, dissolved organic carbon, alkalinity, and anion composition. Water metal speciation was assessed by a speciation model (Chemical Equilibria in Aquatic Systems). Grain-size distribution, organic carbon, carbonate, and acid volatile sulfide (AVS) were determined in sediments. Statistical methods included comparison of means by Mann-Whitney test, ordination and correlation analyses, and analysis of regression for geochemical normalization of metals with grain size. Results and discussion The dissolved metal concentrations, the total metal levels in sediments, and the normalization based on the fine sediment fraction showed that the mining operations constitute potential sources of Fe, Mn, Cr, Cu, Ni, Pb, As, and Hg to Mãe-Bá Lagoon. However, trace metal availability was reduced because of increased pH, hardness, and sulfide content (356 μmol/g) in the sites influenced by the mining. The lagoon showed similar water chemistry as in the mining sites, with metal bioavailability further decreased by the presence of dissolved organic carbon and chloride. Although AVS levels in the lagoon were low (0.48-56 μmol/g), metal bioavailability was reduced because of the presence of organic matter. Metal levels in invertebrates confirmed the predicted low metal bioavailability in Mãe-Bá Lagoon. The lagoon was considered moderately contaminated only by Hg and As. Conclusions The iron-ore mining and processing studied here constitute potential sources of metal pollution into the tropical lagoon. Contrary to expectations, however, it also J Soils Sediments

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Section: Sediment Normalizationmentioning

confidence: 99%

Effects of iron-ore mining and processing on metal bioavailability in a tropical coastal lagoon

et al. 2008

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“…Hg ¼ 15e30 mg m À2 yr À1 ) reflect emissions from industrial sources (Lacerda and Ribeiro, 2004). In Ilha Grande (Great Island), zinc enrichment in the top layers of marsh sediments (rate of deposition ¼ 24e78 mg m À2 yr À1 ) was also attributed to atmospheric deposition (Silva-Filho et al, 1998).…”

Section: Trace Element Concentrations Normalized Concentrations Andmentioning

confidence: 99%

A 2400-year record of trace metal loading in lake sediments of Lagoa Vermelha, southeastern Brazil

Oliveira¹,

Pessenda²,

Fávaro³

et al. 2012

Journal of South American Earth Sciences

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“…Domínios como nanociência e nanotecnologia [11][12][13] , fármacos [14][15][16][17][18] , ambiente [19][20][21][22][23][24][25][26] …”

Section: Publicações Científicasunclassified

Química no Brasil: perspectivas e necessidades para a próxima década - Documento básico

Andrade¹,

Pinto²,

Cadore³

et al. 2005

Quím. Nova

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Changes in lead and mercury atmospheric deposition due to industrial emissions in Southeastern Brazil

Cited by 20 publications

References 27 publications

Effects of iron-ore mining and processing on metal bioavailability in a tropical coastal lagoon

Effects of iron-ore mining and processing on metal bioavailability in a tropical coastal lagoon

A 2400-year record of trace metal loading in lake sediments of Lagoa Vermelha, southeastern Brazil

Química no Brasil: perspectivas e necessidades para a próxima década - Documento básico

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