Bulk, isotopic, petrographic organic matter and mineral distribution as proxies of environmental process in Guanabara Bay, SE, Brazil

Cordeiro, Renato Campello; Santos, Deborah; Santelli, Ricardo Erthal; Figueiredo, Alberto G.; Moreira, Luciane Silva; Machado, Wilson; Meniconi, M. F. G.

doi:10.1007/s00367-021-00698-4

Cited by 6 publications

(3 citation statements)

References 40 publications

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“…Zinc concentrations as SEM presented a maximum value of 7.65 µmol g − 1 recorded at station BG-37 in São João do Meriti river mouth station and a minimum value of 0.06 µmol g − 1 at station BG-02B in the south sector of the bay where there are a higher sea in uence and sediments are sandier (Cordeiro et al 2021). High zinc levels were also observed at stations BG-05 (Rio de Janeiro harbor sector).…”

Section: Acid-volatile Sul Des and Simultaneously Extracted Metalsmentioning

confidence: 88%

“…Gibbisite. TOC, C/N, 15 N δ 13 C) described in Cordeiro et al (2021) were used as explanatory factors for the distribution of simultaneously extracted metals in acid-volatile sul des. The values of metals extracted simultaneously to volatile sul des in acid was performed by comparing with extraction data by method USEPA 3051 at the same sampling stations (Birch et al, 2020) The environmental matrix was based on metal concentrations and SEM, AVS and SEM/AVS data.…”

Section: Discussionmentioning

confidence: 99%

“…Correlation matrix considering mineralogy, organic matter, granulometry, ΣSEM and AVS results.Signi cant correlations are highlighted in red (p < 0.050, n=29). Sedimentological, mineralogical data and elemental and isotopic composition of organic matter can be found inCordeiro et al (2021).…”

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confidence: 99%

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Distribution of acid-volatile sulfides and simultaneously extracted metals in Guanabara Bay: combination of anthropogenic, sedimentological, and geochemical processes

Cordeiro,

Santelli,

Valle Machado

et al. 2024

Environ Sci Pollut Res

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Coastal sedimentary systems are affected by continental and marine metal pollutant inputs associated with different hydrodynamic characteristics and geochemical processes. These include the formation of acid-volatile sul des (AVS) within sediments, which affects metal bioavailability and associated aquatic biota toxicity risks. Physicochemical changes in these environments in the face of extreme natural or man-made environmental in uences can dramatically alter metal bioavailability and toxicity through metal binding and immobilization as insoluble sul des. Surface sediments from Guanabara Bay, rivers mouth and two mangrove areas were collected and AVS and simultaneously extracted metals Cd, Cu, Fe, Mn, Ni, Pb, Zn, ΣSEM were determined to assess sediment quality. A severe eutrophication history favored AVS concentrations exceeding or close to the sum of SEM concentrations, demonstrating that AVS play an important role in making trace metals unavailable for assimilation by living organisms, mitigating the risks of contamination for the local biota. This eutrophication-driven sul de accumulation may attenuate the sediment toxicity in sites heavily polluted by metals, while some fewer eutrophic sites became more exposed to metals in excess to AVS.

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Section: Acid-volatile Sul Des and Simultaneously Extracted Metalsmentioning

confidence: 88%