Arsenic transport between water and sediments

Cornett, Jack; Chant, L.A.; Risto, B. A.

doi:10.1007/bf00026241

Cited by 16 publications

(7 citation statements)

References 30 publications

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“…Particle flux measurements from sediment traps deployed in other lakes are also consistent with other observations (Evans, 1994;Dillon et al, 1990). Further support for this conclusion also can be derived from the models of Cornett et al (1992), Robbins & Eadie (1991), and Walgren et al (1980). These mass balance models required the inclusion of a resuspended flux of activity in order to account for the persistence of isotopes and other contaminants in the water column.…”

Section: Basinsupporting

confidence: 83%

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Identifying resuspended particles using isotope ratios

et al. 1994

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Three simple methods were developed to estimate the proportion of particles in lake water derived from resuspended material. These techniques use the different distributions of long and short-lived radioisotopes sorbed onto particles and were tested in the three basins of Lake Erie using 'Be, 13'Cs and 210Po/210Pb.While the concentration of 210Po on particles did not vary significantly in the lake, resuspended particles were characterized by high concentrations of 13'Cs and low concentrations of 7Be. The distribution of these radioisotopes is consistent with a simple mixing model in which the fraction of particles in the lake water derived from resuspension ranged from I 8 y0 to about 100 %. Higher concentrations of resuspended particles were found in deeper samples from the nepheloid layer and in the shallow western basin where thermal stratification was very weak.

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Section: Basinsupporting

confidence: 83%

“…All "'PO analysis employed 209Po as a yield tracer. Details of the extraction procedure are given in Cornett et al (1984) and Cornett et al (1992).…”

Section: Methodsmentioning

confidence: 99%

Identifying resuspended particles using isotope ratios

et al. 1994

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“…Apatites from some Kiruna-type deposits (Cerro de Mercado and Great Bear) have the highest As contents (929-2,251 ppm) measured in this study. Arsenic is typically sourced from (meta)sedimentary rocks (Lollar, 2004), where it accumulates during the weathering cycle (Cornett et al, 1992). Consequently, an ore-forming fluid passing through (meta)sedimentary rocks may liberate As and make it available for incorporation into later forming minerals such as apatite.…”

Section: Discrimination Of Iocg and Kiruna-type Deposits (Step Iiib mentioning

confidence: 99%

Apatite Trace Element Compositions: A Robust New Tool for Mineral Exploration

et al. 2016

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“…In oligohaline and freshwater sediments, which often contain low concentrations of sulfur, arsenic solubility is less limited by formation of insoluble sulfide minerals. Arsenite, often as arsenolite (As 2 O 3 ), may remain quite mobile and tends to diffuse upward to be released into the overlying water column as either arsenite or arsenate [56,63,70,73, 74]. Thus, arsenic is much more mobile and probably more biovailable in freshwater than in marine ecosystems.…”

Section: Arsenic Speciationmentioning

confidence: 99%

Ecotoxicology of arsenic in the marine environment

Neff

1997

Enviro Toxic and Chemistry

213

241

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Arsenic has a complex marine biogeochemistry that has important implications for its toxicity to marine organisms and their consumers, including humans. The average concentration of total arsenic in the ocean is about 1.7 μg/L, about two orders of magnitude higher than the U.S Environmental Protection Agency's human health criterion (fish consumption) value of 0.0175 μg/L. The dominant form of arsenic in oxygenated marine and brackish waters is arsenate (As V). The more toxic and potentially carcinogenic arsenite (As III) rarely accounts for more than 20% of total arsenic in seawater. Uncontaminated marine sediments contain from 5 to about 40 μg/g dry weight total arsenic. Arsenate dominates in oxidized sediments and is associated primarily with iron oxyhydroxides. In reducing marine sediments, arsenate is reduced to arsenite and is associated primarily with sulfide minerals. Marine algae accumulate arsenate from seawater, reduce it to arsenite, and then oxidize the arsenite to a large number of organoarsenic compounds. The algae release arsenite, methylarsonic acid, and dimethylarsinic acid to seawater. Dissolved arsenite and arsenate are more toxic to marine phytoplankton than to marine invertebrates and fish. This may be due to the fact that marine animals have a limited ability to bioconcentrate inorganic arsenic from seawater but can bioaccumulate organoarsenic compounds from their food. Tissues of marine invertebrates and fish contain high concentrations of arsenic, usually in the range of about 1 to 100 μg/g dry weight, most of it in the form of organoarsenic compounds, particularly arsenobetaine. Organoarsenic compounds are bioaccumulated by human consumers of seafood products, but the arsenic is excreted rapidly, mostly as organoarsenic compounds. Arsenobetaine, the most abundant organoarsenic compound in seafoods, is not toxic or carcinogenic to mammals. Little of the organoarsenic accumulated by humans from seafood is converted to toxic inorganic arsenite. Therefore, marine arsenic represents a low risk to human consumers of fishery products.

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Arsenic transport between water and sediments

Cited by 16 publications

References 30 publications

Identifying resuspended particles using isotope ratios

Identifying resuspended particles using isotope ratios

Apatite Trace Element Compositions: A Robust New Tool for Mineral Exploration

Ecotoxicology of arsenic in the marine environment

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