Biogeochemical Mechanisms of Arsenic Mobilization and Sequestration

Campbell, Kate M.; Hering, Janet G.

doi:10.1002/9780470371046.ch5

Cited by 3 publications

(7 citation statements)

References 124 publications

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“…At BH2, there were similarities in peaks between LOI and As and U between 30 and 50 cm depths. This substantiates that accumulation at BH2 was a product of As and U strong binding affinity to natural organic matter and subsequent deposition (Campbell and Hering 2008;Kalin et al 2004). Similar correlations were also observed at BH5 (Fig.…”

Section: Trace Metal Normalizationssupporting

confidence: 85%

“…Loss of ignition (LOI) was determined to estimate the weight percent of organic matter present in the soils after Singh and Nayak (2008) who reported that the movement of redox sensitive metals in sediments may be controlled by the clay and organic carbon fraction. Sedimentary decomposition of plant or animal matter forms compounds such as melanins, humic acids, and fulvic acids comprise a large group of substances often referred to as natural organic matter, and is considered a probable electron source or substrate for microbial reductive processes including reduction of redox-sensitive elements (Campbell and Hering 2008). For LOI analysis, samples were finely ground with mortar-pestle, dried for 1 h at 105°C, and incinerated at 550°C for 3 h following procedures by Heiri et al (2001).…”

Section: Methodsmentioning

confidence: 99%

“…Arsenic and U are of particular interest for this study due to: (1) prior U mining activities within the BH watershed prompting elevated sediment and surface water As and U concentrations (Stone et al 2007;Kipp et al 2009;Tuombe 2008); (2) the complex geochemistry of As and U [e.g., (Abdelouas et al 1999;Campbell and Hering 2008)]; and (3) potential toxicity towards aquatic and human health (ATSDR 2007(ATSDR , 1999NRC 1999). Currently, there are no established guidelines for sediment As or U concentrations in the United States, although sediment quality guidelines have been established to recommend sediment concentration levels, design monitoring programs, and measure remedial effectiveness (MacDonald et al 2000).…”

Section: Introductionmentioning

confidence: 99%

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Sediment-bound Arsenic and Uranium Within the Bowman–Haley Reservoir, North Dakota

Larson

Stone

2010

Water Air Soil Pollut

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The purpose of this study was to determine the impacts of regional historical uranium mining activities within sediments of the Bowman-Haley reservoir of southwestern North Dakota. The extent of anthropogenic-influenced watershed impacts were quantified through the determination of sediment metals concentrations and metal enrichment factors to evaluate the potential of geochemically influenced As and U remobilization within the reservoir sediments. Sediment cores were collected and analyzed for total metal concentrations at five locations within the reservoir: Spring Creek delta, Alkali Creek delta, two locations within the North Fork of the Grand River confluence, and adjacent to the reservoir outfall. Pearson-moment correlations were used to establish inter-core metal correlations, while sediment enrichment factors were determined relative to background concentrations. Enrichment factor results suggest all sampling sites are classified as minor to moderately enriched for As and U. Metal behavior for the three reservoir inlets indicated similar metal loading sources and post-depositional behavior, while metals migration within the vicinity of the reservoir outlet appear to be controlled by geochemical and/or physical processes. For the reservoir outlet, As and U normalized to Al suggest the occurrence of vertical migration of As, while surface-bound U remobilization was apparent within the water column immediately above the sediments. Elevated U was found within the Spring Creek inlet, and appear attributed to historical uranium processing operations located in Griffin, North Dakota. While the reservoir As and U sediment concentrations may be considered low, their presence appears directly attributed to historical uranium mining activities within the Bowman-Haley reservoir watershed.

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Section: Trace Metal Normalizationssupporting

confidence: 85%

Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Sediment-bound Arsenic and Uranium Within the Bowman–Haley Reservoir, North Dakota

Larson

Stone

2010

Water Air Soil Pollut

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“…Coagulation/filtration was successful at the city of Los Angeles where source water had 22 μg As/L [46] and at the city of Antofagasta in Northern Chile [47] where source water was ~870 μg/L between 1958 and 1970 [48]. Although coagulation/filtration is an excellent method for treating arsenic sourced from surface water due to its efficient removal of inorganic As(V) for municipal water supply [49], it is not suitable for household water treatment due to the large space requirement.…”

Section: Part III Lessons From Maintaining Compliance To Arsenic In mentioning

confidence: 99%

Lessons Learned from Arsenic Mitigation among Private Well Households

Zheng

2017

Curr Envir Health Rpt

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Purpose of Review Many thousands of research papers have been published on the occurrence, health effects, and mitigation of arsenic in drinking water sourced from groundwater around the world. Here, an attempt is made to summarize this large body of knowledge into a small number of lessons. Recent Findings This is an opinion paper reflecting on why we are far from the goal of eliminating this silent and widespread poison to protect the health of many millions. The lessons are drawn from research in countries representing a range of economic development and cultural contexts. The replacement of household wells with centralized water supplies has reduced population level exposure to moderate (50–100 μg/L) and high (>100 μg/L) levels of arsenic in drinking water in some countries as they become wealthier. However, there remains a very large rural population in all countries where the exposure to low levels (10–50 μg/L) of arsenic continues due to its dispersed occurrence in the environment and frequent reliance on private well. A set of natural (geological and biological), socioeconomic, and behavioral barriers to progress are summarized as lessons. They range from challenges in identifying the exposed households due to spatially heterogeneous arsenic distribution in groundwater, difficulties in quantifying the exposure let alone reducing the exposure, failures in maintaining compliance to arsenic drinking water standards, to misplaced risk perceptions and environmental justice issues. Summary Environmental health professionals have an ethical obligationtohelpAsmitigationamongprivatewellwaterhouse-holds, along with physicians, hydrogeologists, water treatment specialists, community organizations, and government.

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“…Tri-valent arsenic primarily exists as H 3 AsO 3 (pK 1 = 9.2), while pentavalent arsenic exists as H 2 AsO 4 and HAsO 4 = (pK 1 = 2.2, pK 2 = 7.0, pK 3 = 11.5) (Smedley and Kinniburgh 2002). Arsenate is thermodynamically stable under oxidized conditions, while arsenite dominates in reducing conditions (Brookins 1988); however, arsenite may be significant in oxic waters due to slow abiotic oxidation kinetics (Campbell and Hering 2008).…”

Section: Introductionmentioning

confidence: 99%

Sediment Pore-Water Interactions Associated With Arsenic and Uranium Transport Within a Uranium Mining-Impacted Watershed in South Dakota

Stone¹,

Larson²,

Kipp³

2011

JASMR

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The extent of historical uranium mining impacts is well documented for the North Cave Hills region of Harding County, South Dakota. While previous studies indicate watershed sediment and surface water exhibit up to 90x established background concentrations for arsenic (As) and uranium (U), it was unclear whether or how localized changes in sediment redox behavior influence contaminant remobilization. Five pore-water equilibration samplers (peepers) were spatially and temporally deployed within the study area to evaluate seasonal solid-liquid equilibria as a function of sediment depth. At a sampling site 2 km downstream of the mine site within a wetlands-dominated deposition zone, seasonal variations of pore-water geochemistry were observed. Summer conditions promoted strongly reducing conditions, resulting in the remobilization of sediment-bound As(III). Fall conditions promoted oxidizing conditions within the sediments, resulting in decreased As (5x) and increased U (10x) concentrations within the sediment pore-waters. Peak pore-water U concentrations (781 μg/L) were 3.5x greater than observed within the surface water (226 μg/L) immediately above the sediments. Pore-water As(V) concentrations peaked directly below the sediment-water interface, suggesting As(V) was scavenged and accumulated by strong interactions with surficial iron (hydr)oxides. The study results suggest that localized redox conditions, especially those dominated by (bio)geochemically-influenced iron and sulfur reducing processes, may influence seasonal As and U behavior within these mining impacted alluvium sediments.

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Biogeochemical Mechanisms of Arsenic Mobilization and Sequestration

Cited by 3 publications

References 124 publications

Sediment-bound Arsenic and Uranium Within the Bowman–Haley Reservoir, North Dakota

Sediment-bound Arsenic and Uranium Within the Bowman–Haley Reservoir, North Dakota

Lessons Learned from Arsenic Mitigation among Private Well Households

Sediment Pore-Water Interactions Associated With Arsenic and Uranium Transport Within a Uranium Mining-Impacted Watershed in South Dakota

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