Natural arsenic in groundwater and alkaline lakes at the upper Paraguay basin, Pantanal, Brazil

Barbiéro, Laurent; Furquím, S.C.; Vallès, Vincent; Furian, Sônia; Sakamoto, Arnaldo Yoso; Filho, A. Rezende; Fort, Monique

doi:10.1016/s1875-1121(06)09004-3

Cited by 13 publications

(32 citation statements)

References 27 publications

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“…The waters of the region have a positive calcite residual alkalinity (RA calcite ) (alkalinity . Ca 2+ in millimoles of charge mmol c ; Droubi et al 1980) and therefore develop a sodic alkaline pathway under the influence of evaporation (Barbiero et al 2002(Barbiero et al , 2004. Such geochemical evolution is frequent in continental arid or semiarid environments and has been described in all the continents ).…”

Section: Discussionmentioning

confidence: 93%

Chemical diversity and spatial variability in myriad lakes in Nhecolândia in the Pantanal wetlands of Brazil

Furian

Martins

Parizotto

et al. 2013

Limnology & Oceanography

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Nearly 15,000 shallow, saline or freshwater lakes and ponds coexist in close proximity in the Nhecolâ ndia, a 24,000 km 2 subregion of the Pantanal wetland in Brazil. This study aims to understand the origin of such diversity in surface water, which is a key aspect for the wetland services and biodiversity in the region. Both soil observations and water samples were collected at the regional or local scale and supplemented by previously published data sets. Statistical and geostatistical treatments were carried out and completed by discrete watertable monitoring. The results confirmed the absence of a regional pattern in surface-water salinity, and the independence of electrical conductivity values, even for neighboring lakes. Despite great differences in chemical composition, all surface waters in the region belong to the same chemical family, corresponding to several concentration stages of the Taquari River water that supplies the region. The concentration stage depends on the hydrological functioning of each lake, which is itself controlled by the relative importance of low-permeability soils as a barrier to movement of water into or out of the lakes through the subsurface. In this framework, oligosaline ponds, freshwater lakes, and saline lakes work as recharge, flow-through, and discharge wetlands, respectively. The salinity observed in some lakes results from an ongoing process of accumulation and evaporation under relatively humid climatic conditions and poor drainage.

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Section: Discussionmentioning

confidence: 93%

Chemical diversity and spatial variability in myriad lakes in Nhecolândia in the Pantanal wetlands of Brazil

Furian

Martins

Parizotto

et al. 2013

Limnology & Oceanography

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show abstract

“…At the local level, water and solute flows are complex (Hamilton et al, 1998) and depend on many classical factors affecting water flows in wetlands, such as the configuration of levees, slight variations in the topography, resistance to flow related to vegetation, local rainfall intensity and tributary inputs (Girard et al, 2010). In addition, in some parts of the Pantanal characterized by an absence of apparent drainage networks, the sub-surface flows are controlled by systems of thresholds between lakes (Barbiero et al, 2007. According to Hamilton et al (1997) and on annual basis, the inflow of water in the Pantanal is nearly equivalent to the amount drained.…”

Section: The Pantanal Wetlandsmentioning

confidence: 99%

Hydrochemical variability at the Upper Paraguay Basin and Pantanal wetland

Filho

Furian²,

Victória³

et al. 2012

Hydrol. Earth Syst. Sci.

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Abstract.Compartmentalization is a prerequisite to understand large wetlands that receive water from several sources. However, it faces the heterogeneity in space and time, resulting from physical, chemical and biological processes that are specific to wetlands. The Pantanal is a vast seasonally flooded continental wetland located in the centre of South America. The chemical composition of the waters that supply the Pantanal (70 rivers) has been studied in order to establish a compartmentalization of the wetland based on soil-water interactions. A PCA-based EMMA (EndMembers Mixing Analysis) procedure shows that the chemistry of the rivers can be viewed as a mixture of 3 endmembers, influenced by lithology and land use, and delimiting large regions. Although the chemical composition of the end-members changed between dry and wet seasons, their spatial distribution was maintained. The results were extended to the floodplain by simple tributary mixing calculation according to the hydrographical network and to the areas of influence for each river when in overflow conditions. The resulting map highlights areas of high geochemical contrast on either side of the river Cuiaba in the north, and of the rivers Aquidauana and Abobral in the south. The PCAbased treatment on a sampling conducted in the Nhecolândia, a large sub region of the Pantanal, allowed the identification and ordering of the processes that control the geochemical variability of the surface waters. Despite an enormous variability in electrical conductivity and pH, all data collected were in agreement with an evaporation process of the Taquari River water, which supplies the region. Evaporation and associated saline precipitations (Mg-calcite, Mg-silicates Ksilicates) explained more than 77 % of the total variability in the chemistry of the regional surface water sampling.

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“…Essa região tem sido objeto de recentes pesquisas, das quais se destacam aquelas voltadas aos processos pedológicos que acompanham a mineralização das águas (Rezende Filho, 2006;Furquim, 2007;Barbiero, et al, 2008). Os estudos de solos realizados entre lagoas contíguas mostraram que os regimes hídricos das lagoas são comandados por horizontes verdes argilosos, mais ou menos cimentados, cujos complexos sortivos, saturados em sódio (Na/T>25%), limitam fortemente a permeabilidade.…”

Section: -Introdução E Justificativaunclassified

“…A presença desses horizontes vinha sendo associada ao ambiente alcalino do entorno das lagoas salinas (Sakamoto, 1997;Rezende Filho, 2006;Furquim, 2007;Furquim et al, 2004;2009). Contudo, eles também foram encontrados em áreas não ocupadas por salinas, em pequenas depressões preenchidas com águas apenas durante as enchentes.…”

Section: -Introdução E Justificativaunclassified

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Estudo morfológico e hidroquímico de pequenas depressões na Nhecolândia, Pantanal, MS

Parizotto¹

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Natural arsenic in groundwater and alkaline lakes at the upper Paraguay basin, Pantanal, Brazil

Cited by 13 publications

References 27 publications

Chemical diversity and spatial variability in myriad lakes in Nhecolândia in the Pantanal wetlands of Brazil

Chemical diversity and spatial variability in myriad lakes in Nhecolândia in the Pantanal wetlands of Brazil

Hydrochemical variability at the Upper Paraguay Basin and Pantanal wetland

Estudo morfológico e hidroquímico de pequenas depressões na Nhecolândia, Pantanal, MS

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