Distribution and Geochemistry of Arsenic in Sediments of the World’s Largest Choked Estuary: the Patos Lagoon, Brazil

Costa, Larissa; Mirlean, Nicolai; Quintana, Guilherme; Adebayo, Segun; Johannesson, Karen H.

doi:10.1007/s12237-019-00596-0

Cited by 15 publications

(2 citation statements)

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“…The burrowing crab (Neohelice granulata) is the main animal species that lives in the salt marshes from the SM site (Costa et al, 2003). The activities of these crustaceans promote significant alterations in the physicochemical aspects of the sediments (Costa et al, 2019). These animals can excavate semi-permanent vertical tunnels of about 10 cm diameter and 1 m depth (Angeletti and Cervellini, 2015), removing and redistributing considerable amounts of sediment (Iribarne et al, 2000).…”

Section: Conductivity and Ph Of Superficial Pore Watermentioning

confidence: 99%

“…However, these low Free-S 2contents at SM sediments probably are caused by re-oxidizing processes induced by bioturbation (Ferreira, 2010). The biological disturbances caused by native vegetation roots and burrow crabs are capable of facilitating the penetration of oxygen up to 25 -35 cm depth in the sediment column of the salt marshes from Patos Lagoon estuary (Costa et al, 2017;Costa et al, 2019). Such oxidizing conditions could affect the sulfate reduction process, hampering the formation of sulfides.…”

Section: Conductivity and Ph Of Superficial Pore Watermentioning

confidence: 99%

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Sulfate reduction and alterability of sulfur species in sediments of an estuary with irregular hydrological regime

Mirlean

Quintana

et al. 2020

Ocean Coast. Res.

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Sulfate reduction and alterability of sulfur species in sediments of an estuary with irregular hydrological regime The irregular hydrological regime in Patos Lagoon estuary has been suggested as having a distinctive influence on sulfur speciation in sediments. We performed an investigation for different prolonged hydrological conditions focusing on the distribution of sulfides (acid volatile sulfide (AVS), chromium reducible sulfide (CRS), and FreeS 2-) in sediment cores from salt marsh and non-vegetated shallow zone. Significant differences in sulfides content and distribution between the different hydrological periods were found. The predominance of more reducing conditions was observed during the freshwater period. It reflects a higher total reducible inorganic sulfur (TRIS) content in this period, with a great accumulation of AVS in sediments (> 100 mg kg-1). In the maximum salinity period, more oxidizing conditions prevailed, which significantly decreased the concentrations of metastable sulfides. The intense bioirrigation process exerts control over sulfide formation and distribution, which is as important as that exerted by the variations of the hydrological regime.

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Section: Conductivity and Ph Of Superficial Pore Watermentioning

confidence: 99%