Natural attenuation processes for remediation of arsenic contaminated soils and groundwater

Wang, Suiling; Mulligan, Catherine N.

doi:10.1016/j.jhazmat.2006.09.048

Cited by 239 publications

(119 citation statements)

References 77 publications

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“…Dissolution of these soluble products of atmospheric/partial oxidation of pyrite enhanced the mobility of Pb but not As (Table 8). These differences could be attributed to the strong adsorption of As onto Fe-oxyhydroxides/oxides, which were also formed as a consequence of pyrite oxidation (Cornelis et al, 2008;Dousova et al, 2003;Dzombak and Morel, 1990;Gosh and Teoh, 1985;Lin and Puls, 2000;Wang and Mulligan, 2006). In contrast, Pb precipitation or adsorption onto Feoxyhydroxides/oxides was minimal especially in the acidic region, which could explain its substantial increase in the leachate of the bulk rock (Tables 8 and 11).…”

Section: Soluble Arsenic and Lead-bearing Phases Calcite Dissolutionmentioning

confidence: 99%

The roles of pyrite and calcite in the mobilization of arsenic and lead from hydrothermally altered rocks excavated in Hokkaido, Japan

Tabelin¹,

Igarashi²,

Tamoto³

et al. 2012

Journal of Geochemical Exploration

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This paper describes the enrichment of hydrothermally altered volcanic and sedimentary rocks with arsenic (As) and lead (Pb), and the effects of pyrite and calcite on the mobilities and release mechanisms of these toxic elements under oxic and anoxic conditions. Enrichment of the altered rock with As and Pb predominantly occurred in precipitated pyrite grains and not on the alumino-silicate minerals making up the matrix of the rock. Arsenic was incorporated in pyrite grains formed during alteration in both volcanic and sedimentary rocks, but Pb was only found in the pyrite grains of the volcanic rock samples. When in contact with water, altered volcanic rocks had acidic pH while altered sedimentary rocks had alkaline pH. The mobilities of both As and Pb from the altered rocks were enhanced at acidic and alkaline pH and a minimum was observed in the circumneutral pH under both oxic and anoxic conditions. The absence of O 2 retarded the oxidation of pyrite most notably in the alkaline region but not in the acidic and circumneutral pH. The absence of CO 2 increased the pH of samples with significant calcite content but did not affect those containing substantial amounts of pyrite. Increasing the CO 2 also had insignificant effect on the concentrations of As and Pb in the leachate. The mechanisms controlling the mobilization of As and Pb from these rocks like dissolution of soluble secondary minerals, pyrite oxidation and adsorption were all related to pyrite while the pH of the rock when in contact with water was controlled by pyrite and calcite. Thus, excavated waste rocks that have been altered can be grouped based on the relative abundance of pyrite and calcite and their pH when in contact with water.

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Section: Soluble Arsenic and Lead-bearing Phases Calcite Dissolutionmentioning

confidence: 99%

The roles of pyrite and calcite in the mobilization of arsenic and lead from hydrothermally altered rocks excavated in Hokkaido, Japan

Tabelin¹,

Igarashi²,

Tamoto³

et al. 2012

Journal of Geochemical Exploration

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“…The adsorption process also may be affected by competing anions, such as phosphate (P), chromate, sulfate, and molybdate, present in the medium. Maximum adsorption of arsenate on kaolinite, montmorillonite, and illite occurs at pH 5, 6, and 6.5, respectively, and the adsorption rate decreases in the presence of competing anions, such as phosphates [133,134]. Surface area is another important key factor affecting the adsorption of As by clay minerals.…”

Section: Arsenic Adsorption On Clay Mineralsmentioning

confidence: 99%

Natural Arsenic in Global Groundwaters: Distribution and Geochemical Triggers for Mobilization

et al. 2016

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The elevated concentration of arsenic (As) in the groundwaters of many countries worldwide has received much attention during recent decades. This article presents an overview of the natural geochemical processes that mobilize As from aquifer sediments into groundwater and provides a concise description of the distribution of As in different global groundwater systems, with an emphasis on the highly vulnerable regions of Southeast Asia, the USA, Latin America, and Europe. Natural biogeochemical processes and anthropogenic activities may lead to the contamination of groundwaters by increased As concentrations. The primary source of As in groundwater is predominantly natural (geogenic) and mobilized through complex biogeochemical interactions within various aquifer solids and water. Sulfide minerals such as arsenopyrite and As-substituted pyrite, as well as other sulfide minerals, are susceptible to oxidation in the near-surface environment and quantitatively release significant quantities of As in the sediments. The geochemistry of As generally is a function of its multiple oxidation states, speciation, and redox transformation. The reductive dissolution of As-bearing Fe(III) oxides and sulfide oxidation are the most common and significant geochemical triggers that release As from aquifer sediments into groundwaters. The mobilization of As in groundwater is controlled by adsorption onto metal oxyhydroxides and clay minerals. According to recent estimates, more than 130 million people worldwide potentially are exposed to As in drinking water at levels above the World Health Organization's (WHO's) guideline value of 10 μg/L. Hence, community education to strengthen public awareness, the involvement and capacity building of local stakeholders in targeting As-safe aquifers, and direct action and implementation of best practices in identifying safe groundwater sources for the installation of safe drinking water wells through action and enforcement by local governments and international water sector professionals are urgent necessities for sustainable As mitigation on a global scale.

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“…Precipitation of dissolved Fe could effectively lower the concentration of As via co-precipitation and adsorption reactions (Cornelis et al, 2008;Dousova et al, 2003;Dzombak and Morel, 1990;Ghosh and Teoh, 1985;Wang and Mulligan, 2006). However, depletion of O 2 under anoxic conditions reduced the extent of Fe oxyhydroxides/oxides precipitation resulting in high Fe and…”

Section: Arsenic Mobilization Under Anoxic Conditionsmentioning

confidence: 99%

Mobilization and speciation of arsenic from hydrothermally altered rock containing calcite and pyrite under anoxic conditions

Tabelin

Igarashi

Yoneda

2012

Applied Geochemistry

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The effects of water residence time and anoxic conditions on the mobilization and speciation of arsenic (As) in a calcite-and pyrite-bearing altered rock excavated during a road-tunnel project has been evaluated using batch and column laboratory experiments. Higher infiltration rates (i.e., shorter water residence times) enhanced the leaching of As due to the higher pH values of the effluents and more rapid transport of dissolved As through the columns. The concentration of As in the effluent also increased under anoxic conditions regardless of the water residence time.This enhanced leaching of As under anoxic conditions could be attributed to a significant pH increase and decreased Fe oxyhydroxides/oxides precipitation compared to similar experiments done under ambient conditions. Processes that controlled the evolution of pH and the temporal release mechanisms of As under anoxic conditions were identical to those previously observed under ambient conditions: the dissolution of soluble phases, pyrite oxidation, co-precipitation and/or adsorption/desorption reactions. Speciation of As in the column experiments could partly be attributed to the pH-dependent adsorption of As species onto Fe oxyhydroxides/oxides precipitates. Moreover, apparent equilibriums of the total As and arsenite (As[III]) concentrations were delayed under anoxic conditions in both batch and column experiments.

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Natural attenuation processes for remediation of arsenic contaminated soils and groundwater

Cited by 239 publications

References 77 publications

The roles of pyrite and calcite in the mobilization of arsenic and lead from hydrothermally altered rocks excavated in Hokkaido, Japan

The roles of pyrite and calcite in the mobilization of arsenic and lead from hydrothermally altered rocks excavated in Hokkaido, Japan

Natural Arsenic in Global Groundwaters: Distribution and Geochemical Triggers for Mobilization

Mobilization and speciation of arsenic from hydrothermally altered rock containing calcite and pyrite under anoxic conditions

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