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Arsenic: Arsenic ( 46 articles)

Groundwater arsenic variations: the role of local geology and rainfall (Hits : 13)
High concentrations of As were detected in the aquifer system of Zimapán Valley, Mexico. Arsenic is related to a multisource system, both natural and anthropogenic. The main source is As bearing-rocks. Groundwater As variations were detected in the more polluted urban deep well.
Mineralogical and geomicrobiological investigations on groundwater arsenic enrichment in B (Hits : 8)
Sources of As in the Ganges sediments and microbial mechanisms of its release in groundwater were examined in the present study, where the authors have systematically examined the pertinent mineral species present in the sediments using XRD, TEM-EDS and EPMA techniques.
Redox control of arsenic mobilization in Bangladesh groundwater (Hits : 8)
Detailed hydrochemical measurements, 34SSO4 and 3H analyses were performed on 37 groundwater samples collected during February 1999, January and March 2000 from 6 locations in eastern and southeastern Bangladesh to examine redox processes that lead to As mobilization in groundwater.
Arsenic enrichment in groundwater of the alluvial aquifers in Bangladesh: an overview (Hits : 8)
Arsenic in the groundwater of Bangladesh is a serious natural calamity and a public health hazard. Most groundwater from the shallow alluvial aquifers (<150 m), particularly in the Holocene plain lands, are vulnerable to As-enrichment.
Behavior of arsenic and geochemical modeling of arsenic enrichment in aqueous environments (Hits : 8)
Arsenic is present in aqueous environments in +III and +V oxidation states. In oxidizing environments, the principle attenuation mechanism of As migration is its adsorption on Fe(III) oxide and hydroxides. The adsorption affinity is higher for As(V) under lower pH conditions and for As(III) under higher pH conditions.
Study of the precipitation equilibria of arsenate anion with calcium and magnesium in sodi (Hits : 8)
The stabilities of solid Ca and Mg arsenates were established by solubility experiments from the pH and total aqueous Ca, Mg and As concentrations. The experimental data were consistent with the following solid phases defined as a function of the pH range
Arsenic mobility in groundwater/surface water systems in carbonate-rich Pleistocene glacia (Hits : 8)
Within the Lower Peninsula of Michigan, groundwaters from the Marshall Formation (Mississippian) contain As derived from As-rich pyrites, often exceeding the World Heath Organization drinking water limit of 10 g/L. Many Michigan watersheds, established on top of Pleistocene glacial drift derived from erosion of the underlying Marshall Formation
Geochemical and hydrodynamic controls on arsenic and trace metal cycling in a seasonally s (Hits : 8)
The phase distribution of trace metals and oxyanions, including U and As, in 2 surface water bodies was investigated within a South Texas watershed hosting a high density of surface U mine pits and tailings.
Spatial variability of arsenic in some iron-rich deposits generated by acid mine drainage (Hits : 8)
Potential contamination of rivers by trace elements can be controlled, among others, by the precipitation of oxyhydroxides. The streambed of the studied area, located in “La Châtaigneraie” district (Lot River Basin, France).
Arsenic fractionation in a fine soil fraction and influence of various anions on its mobil (Hits : 8)
The degree to which anions can affect As mobility in subsurface environments depends on As speciation and fractionation in the soil. In this study, the fine soil fraction of an acidic soil was deliberately contaminated with arsenate (As(V)) and adequately aged for more than 220 days.

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