Modelling of iron cycling and its impact on the electron balance at a petroleum hydrocarbon contaminated site in Hnevice, Czech Republic

Vencelides, Zbyněk; Šráček, Ondřej; Prommer, Henning

doi:10.1016/j.jconhyd.2006.09.003

Cited by 33 publications

(24 citation statements)

References 28 publications

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“…Several electron-accepting processes seem to operate simultaneously, for example, NO 3 -, Fe(III) and SO 4 2-reduction. One of reasons may be the variable reactivity of Fe(III) minerals and their coating by precipitated Fe(II) minerals observed at petroleum hydrocarbon-contaminated sites (Vencelides et al 2007). Reductive dissolution of Fe(III) in the coarse aquifer sediments also results in the release of adsorbed PO 4 3-along with As into the groundwater Mukherjee and Bhattacharya 2001;Bhattacharya et al 2002bBhattacharya et al , 2006.…”

Section: Discussionmentioning

confidence: 99%

Groundwater chemistry and arsenic mobilization in the Holocene flood plains in south-central Bangladesh

Bhattacharya

Hasan

Šráček

et al. 2009

Environ Geochem Health

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A comparative study of arsenic enrichment in the Bengal Delta (BD) was carried out in three alluvial aquifers in south-central Bangladesh. Investigated sites included Sonargaon in Narayanganj, Chandina in Comilla and Sirajdikhan in Munshiganj districts. At all sites samples from different depths were collected, and water chemistry and redox status vs. depth trends were determined. The concentrations of DOC and HCO(3)(-) were highest at Sirajdikhan site, while at the Sonargaon and Chandina sites the concentrations were lower. On the contrary, the NH(4)(+) concentration was high at the Chandina site as compared to the other sites. There was a good match between dissolved As and Fe at the Sirajdikhan and Sonargaon sites, but not at the Chandina site. The dissolved aqueous concentration of Mn was low at the Chandina site, which suggested that the Mn(IV) redox buffering step was missing. Speciation modeling indicated a possibility of siderite precipitation at all sites, but precipitation of rhodochrosite only at the Sonargaon and Sirajdikhan sites. At the Sirajdikhan site, the log P(CO2) values were very high (-1.37), which revealed the production of CO(2) in redox processes. Principal component analysis (PCA) indicated an impact of sea water and redox status of different samples. These results suggest that the dissolved As is de-coupled from dissolved Mn because when released, As is re-adsorbed onto the Fe(III) minerals in solid phase, as well as from dissolved Fe when precipitation of Fe(II) minerals controls the aqueous concentrations of Fe. In addition, several other concurrent redox processes may exert kinetic constraints depending on refractory characteristics of Fe(III) minerals.

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Section: Discussionmentioning

confidence: 99%

Groundwater chemistry and arsenic mobilization in the Holocene flood plains in south-central Bangladesh

Bhattacharya

Hasan

Šráček

et al. 2009

Environ Geochem Health

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“…Nonconservative behaviour of Fe is probably due to the precipitation of secondary Fe(II) phases such as siderite, FeCO 3 , and vivianite, Fe 3 (PO 4 ) 2 ·8H 2 O Ahmed et al, 2004). These secondary Fe(II) phases may also form coatings on the surface of Fe(III)-oxyhydroxides, thus preventing their further dissolution (Vencelides et al, 2007). Suggested precipitation of secondary phases of both Fe(II) and Mn(II) is in a good agreement with positive saturation indices for minerals such as siderite, vivianite (in both districts) and rhodochrosite, MnCO 3 (only in Bongaigaon district).…”

Section: Arsenic Release Processesmentioning

confidence: 99%

Hydrogeochemical controls on mobilization of arsenic in groundwater of a part of Brahmaputra river floodplain, India

Mahanta

Enmark

Nordborg

et al. 2015

Journal of Hydrology: Regional Studies

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“…For example, precipitation of iron minerals may results in de-coupling of As and Fe ) and, furthermore, secondary minerals such as siderite may be coating primary Fe-oxyhydroxides, preventing their dissolution (Vencelides et al 2007).…”

Section: Speciation Modelingmentioning

confidence: 99%

Arsenic enrichment in groundwater in the middle Gangetic Plain of Ghazipur District in Uttar Pradesh, India

Kumar

Ramanathan

et al. 2010

Journal of Geochemical Exploration

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Modelling of iron cycling and its impact on the electron balance at a petroleum hydrocarbon contaminated site in Hnevice, Czech Republic

Cited by 33 publications

References 28 publications

Groundwater chemistry and arsenic mobilization in the Holocene flood plains in south-central Bangladesh

Groundwater chemistry and arsenic mobilization in the Holocene flood plains in south-central Bangladesh

Hydrogeochemical controls on mobilization of arsenic in groundwater of a part of Brahmaputra river floodplain, India

Arsenic enrichment in groundwater in the middle Gangetic Plain of Ghazipur District in Uttar Pradesh, India

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