Detailed model for the mobility of arsenic in lacustrine sediments based on measurements in Lake Ohakuri

Aggett, J.; O'Brien, Glennys

doi:10.1021/es00133a002

Cited by 162 publications

(85 citation statements)

References 6 publications

(19 reference statements)

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“…Arsenate is strongly adsorbed to iron hydroxides in oxidized sediment, whereas in anaerobic sediment it is largely free arsenate or reduced to arsenite, which is much less strongly bound to particles (Masscheleyn et al 1991). Thus, arsenate tends to migrate into oxidized surface sediments from the water column, while arsenite fluxes out of sediments when the surfac'e sediment and bottom water become reducing (Aggett and O'Brien 1985;Riedel et al 1987Riedel et al , 1989, and accumulates in anoxic bottom water. When that water is mixed with surface oxidized water, it will rapidly be ox- DMA has been noted on several occasions in the Patuxent River.…”

Section: Arsenatementioning

confidence: 99%

“…Two inorganic forms are commonly found in nature. Arsenate (AS0 4 3-), the oxidized form, is the most common, while arsenite (As0 2 -) is found predominantly in reducing conditions such as sediment pore waters or anoxic bottom waters (Andreae 1978(Andreae , 1979Peterson and Carpenter 1983;Andreae and Froelich 1984;Aggett and O'Brien 1985; Van der Weijden et al 1990). In oxic water or sediment, arsenite oxidizes relatively rapidly, with a half-time on the order of days, depending upon temperature, pH, biological activity, and the presence of iron and manganese hydroxides (Johnson and Pilson 1975;Scudlark andJohnson 1982;De Vitre et al 1991).…”

Section: Introductionmentioning

confidence: 99%

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The Annual Cycle of Arsenic in a Temperate Estuary

Riedel

1993

Estuaries

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Dissolved concentrations of four forms of arsenic: arsenite, arsenate, monomethylarsenic, and dimethylarsenic, were measured in the Patuxent River Estuary near Benedict, Maryland, over two annual cycles. In each year, total arsenic concentrations peaked in the summer, in lateJuly and August, while minimum concentrations occurred in winter. Except in late winter, arsenate was a predominant form of arsenic present. In late winter and spring, dimethylarsenic was also a predominant form. A period of monomethylarsenic abundance occurred in summer, following the predominance of dimethylarsenic. Arsenite occurred irregularly in spring. Concurrent temperature and salinity measurements indicate that total arsenic concentrations rose before the summer increase in salinity, suggesting an arsenic source other than the end members, the Patuxent River or Chesapeake Bay.

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Section: Arsenatementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

The Annual Cycle of Arsenic in a Temperate Estuary

Riedel

1993

Estuaries

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“…Several authors have studied the concentrations of arsenic in components of the river system (Reay 1973;Timperley 1979;Aggett & Aspell 1980) and a model for some aspects of this element's behaviour in the river has been proposed (Aggett & O'Brien 1985). The Waikato River catchment showing sampling sites for water and macrophytes at the eight reservoir dams (2-10), at the Lake Taupo outlet (1), in the Waipa River (12), and at four sites on the lower Waikato River (11,(13)(14)(15).…”

Section: Introductionmentioning

confidence: 99%

Lithium and rubidium in the Waikato River, New Zealand

Timperley

1988

New Zealand Journal of Marine and Freshwater Research

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Lithium and rubidium in the Waikato River originate partly from geothermal fluids and partly from weathering of surficial volcanic rocks. This paper reports on the distribution and behaviour of these metals in the river system. Total Li concentrations in the river water increased from 0.079 g/m 3 at the Lake Taupo outlet to 0.435 g/m 3 at Mercer, but the ratios of filtrable to particulate metal decreased from 1.82 to 0.322, respectively. The corresponding concentrations for Rb were 0.038 and 0.626 g/m 3, and the ratios were 0.095 and 0.040. Geothermal fluids are the source of about 80% of filtrable Li but only 50% of filtrable Rb. Weathering of volcanic rocks contributes the remainder of the metals. Approximately 11001 each of total Li and total Rb flow annually past Lake Aratiatia and more than 99% of these totals flow into the Tasman Sea. About 3 t of Li and 6 t of Rb accumulate each year into reservoir sediment; reservoir macrophytes, which probably turn over each year, could contain up to 0.5 t of Li and 8.4 t of Rb. Within the reservoir sediments and macrophytes, Li, Rb, and K each show different distributions.

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“…Since these samples were filtered in the laboratory, it is reasonable to assume that there were losses of iron due to the precipitation of hydrous iron oxides that occurred during shipping and storage (prior to filtration) and that the losses of the As anion resulted from co-precipitation with the hydrous iron oxides. Several studies (Korte and Fernando 1991;Korte et al 1976;Jenne 1968) have shown that anions are more readily removed by iron oxides than cations, and that the most important mechanism for the accumulation of arsenic in sediment is adsorption on and coprecipitation with hydrous iron oxides (Aggett and O'Brien 1985;Aggett and Roberts 1986 [as given by Mok and Wai 1990]; Korte 1991). The findings between the filtered and unfiltered Snap Sampler samples were also similar.…”

Section: Comparing the Filtered Vs Unfiltered Low-flow Samplesmentioning

confidence: 63%

Demonstration/Validation of the Snap Sampler Passive Ground Water Sampling Device for Sampling Inorganic Analytes at the Former Pease Air Force Base

Parker¹,

Mulherin²,

Gooch³

et al. 2009

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Laboratory studies and a field demonstration were conducted to determine the ability of the Snap Sampler to recover representative concentrations of several types of inorganic analytes from ground water. Analytes included non-metals, transition metals, alkaline earth metals, alkali metals, and a metalloid. In the laboratory studies, concentrations of analytes in Snap Sampler samples were com-parable with concentrations of the analytes in samples collected from a standpipe (i.e., control samples). For the field demonstration, there were sampling events at the former Pease Air Force Base. Samples taken using a Snap Sampler were compared with samples collected using conventional low-flow purging and sampling and a regenerated cellulose passive diffusion sampler. Based upon statistical analyses, analyte concentrations were found to be equivalent to those in the low-flow samples with one exception -unfiltered iron, where concentrations were significantly higher in the Snap Sampler samples. Differences were most pronounced in samples collected from the two stainless steel wells and from wells with higher turbidity levels. Elevated turbidities may have resulted from installing additional sampling equipment (including the baffle, pump, samplers, and bottom weight) in the well before sampling. We will examine this issue further at our next test site.

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Detailed model for the mobility of arsenic in lacustrine sediments based on measurements in Lake Ohakuri

Cited by 162 publications

References 6 publications

The Annual Cycle of Arsenic in a Temperate Estuary

The Annual Cycle of Arsenic in a Temperate Estuary

Lithium and rubidium in the Waikato River, New Zealand

Demonstration/Validation of the Snap Sampler Passive Ground Water Sampling Device for Sampling Inorganic Analytes at the Former Pease Air Force Base

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