Model for the formation of arsenic contamination in groundwater: 2. Influence of sorption

Ryzhenko, B. N.; Cherkasova, E. V.; Limantseva, O. A.

doi:10.1134/s0016702909100036

Cited by 5 publications

(5 citation statements)

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“…4), made on a computer program for simulating chemical reactions and transport processes called PHREEQC (pH-Redox-EquilibriumConcentrations) from the U.S. Geological Service, confirms explanation of mechanism desorption of oxide minerals, given that almost all elements (Fe, As, Mn, Cu and Pb) are in the oxide form. The As are in As(V) and As(III) species which are in negative saturation index, whereby solubilize in elemental forms, the same behavior happens for all other trace elements analyzed; oxides of (Fe, Mn, Cu and Pb) are solubilized in the groundwater with different intensities (Ryzhenko et al 2009). …”

Section: Arsenic Relationships and Variationsmentioning

confidence: 76%

“…The neutral pH and the reductive conditions are in accordant situations, where desorption of oxide minerals and reduction-related dissolution of Fe and Mn oxides are the solubility mechanisms of (As) (Ryzhenko et al 2009;Krainov et al 2007). These conditions are common in aquifers systems like Baix Ter, with young quaternary sediments, mineral carbonate abundance rich in iron and manganese oxides, low gradient and semiarid environments (Smedley and Kinniburgh 2002;Krainov et al 2007).…”

Section: Arsenic Relationships and Variationsmentioning

confidence: 99%

“…In many aquatic environments (As) species are in the form of oxyacid. Under oxidizing conditions (As), species are in the form of arsenic (V) or arsenate anions (AsO 4 3− ), where (H 2 AsO 4 − ) is the most thermodynamically stable species at pH between 2 and 7 (Ryzhenko et al 2009). In contrast, under reducing conditions the predominant species are As(III) or arsenite anions (AsO 3 3− ), where neutral arsenite (H 3 AsO 3 ) is thermodynamically the most stable species up to about pH 9 (Krainov et al 2007;Ryzhenko et al 2009).…”

Section: Introductionmentioning

confidence: 99%

“…Under oxidizing conditions (As), species are in the form of arsenic (V) or arsenate anions (AsO 4 3− ), where (H 2 AsO 4 − ) is the most thermodynamically stable species at pH between 2 and 7 (Ryzhenko et al 2009). In contrast, under reducing conditions the predominant species are As(III) or arsenite anions (AsO 3 3− ), where neutral arsenite (H 3 AsO 3 ) is thermodynamically the most stable species up to about pH 9 (Krainov et al 2007;Ryzhenko et al 2009). Arsenates, arsenate anions, and neutral arsenite constitute the main targets for field analysis, and they are actors in groundwater natural pollution (Pérez-Carrera and Fernández 2010).…”

Section: Introductionmentioning

confidence: 99%

“…The basic trigger mechanism for the dissolution of As in porewaters environments of sedimentary basins, with neutral pH and reducing geochemical environments, can be associated to reduction-related dissolution of Fe and Mn oxides minerals, which results in the migration of As(III), Fe(II) and Mn(II) into the aqueous phase where they can reach high concentrations of these elements with a positive correlation between them (Smedley and Kinniburgh 2002), while the concentrations of (SO 4 2− ) remains low (less than 1 mg/L). The high concentrations of phosphates, bicarbonates, silicates, and, possibly, organic matter may be favorable for As desorption (Anawar et al 2006;Ryzhenko et al 2009). …”

Section: Introductionmentioning

confidence: 99%

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Groundwater arsenic contamination and their variations on episode of drought: Ter River delta in Catalonia, Spain

2018

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The analysis and prospection using hydrogeochemical methodologies on arsenic (As) contamination episode in region of Spain (Girona, Cataluña) was investigated on the period (2000)(2001)(2002)(2003)(2004)(2005)(2006)(2007)(2008)(2009)(2010)(2011), to analyze the mechanisms and characteristics of process on the solubilization of As in groundwater and effects of the episode of severe drought (2006)(2007) on hydrogeochemical characteristics of the aquifer. The aquifer of study is a Mediterranean Delta; the geology of the zone has influence from sedimentary deposition of Ter River Basin and the prograde and draw back of the history coastline. The aquifer is an alluvial system where mean concentration of (As) is 30 µg/L in groundwater; parallel to this, the concentrations of elements iron (Fe) and manganese (Mn) exceed the guidelines of the World Health Organization (Guidelines for drinking-water quality electronic resource incorporating 1st and 2nd addenda, vol 1, Recommendations, 3rd edn, World Health Organization, Geneva, 2006) for drinking water. Range concentrations from other elements found in the groundwater were: Aluminum (Al, 4-716 µg/L), Barium (Ba, 48-603 µg/L), Cupper (Cu, 0.2-105.3 µg/L), Chrome (Cr, 1.1-47 µg/L) and Nickel (Ni, 1-51 µg/L). The arsenic solubilization trigger mechanism comes from desorption of oxide minerals and reduction related on neutral pH and reductive environment; the source of this kind of oxides is probably from marine sediments deposited in the process of delta's formation. During the climatic event of drought (2006)(2007), the As concentration was responding to decline levels of the water volume on the aquifer, increasing their concentration and localized in a small area of the study zone, and these are effects of the reduction in groundwater flow on the aquifer.

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Section: Arsenic Relationships and Variationsmentioning

confidence: 76%