Mobilization of selenium from the Mancos Shale and associated soils in the lower Uncompahgre River Basin, Colorado

Mast, M. Alisa; Mills, Taylor J.; Paschke, Suzanne S.; Keith, Gabrielle; Linard, Joshua

doi:10.1016/j.apgeochem.2014.06.024

Cited by 29 publications

(12 citation statements)

References 31 publications

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“…Water samples were promptly filtered and analyzed for standard cations, anions, silica, and selected metals including strontium, iron, aluminum, manganese, and selenium. Metals were chosen to assist in the delineation of flow paths through the underlying Mesozoic sedimentary units since the Mancos Shale is a known source of selenium [ Mast et al , ; Tuttle et al , , ].…”

Section: Site Description and Methodsmentioning

confidence: 99%

Is there a geomorphic expression of interbasin groundwater flow in watersheds? Interactions between interbasin groundwater flow, springs, streams, and geomorphology

Frisbee

Tysor

Stewart-Maddox

et al. 2016

Geophysical Research Letters

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Interbasin groundwater flow (IGF) can play a significant role in the generation and geochemical evolution of streamflow. However, it is exceedingly difficult to identify IGF and to determine the location and quantity of water that is exchanged between watersheds. How does IGF affect landscape/watershed geomorphic evolution? Can geomorphic metrics be used to identify the presence of IGF? We examine these questions in two adjacent sedimentary watersheds in northern New Mexico using a combination of geomorphic/landscape metrics, springflow residence times, and spatial geochemical patterns. IGF is expressed geomorphically in the landscape placement of springs and flow direction and shape of stream channels. Springs emerge preferentially on one side of stream valleys where landscape incision has intercepted IGF flow paths. Stream channels grow toward the IGF source and show little bifurcation. In addition, radiocarbon residence times of springs decrease and the geochemical composition of springs changes as the connection to IGF is lost.

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Section: Site Description and Methodsmentioning

confidence: 99%

Is there a geomorphic expression of interbasin groundwater flow in watersheds? Interactions between interbasin groundwater flow, springs, streams, and geomorphology

Frisbee

Tysor

Stewart-Maddox

et al. 2016

Geophysical Research Letters

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“…It has been shown that irrigation of agricultural lands overlying Se rich rocks mobilizes Se which leads to high Se concentrations in subsurface drainage especially in semiarid regions [41][42]. Selenium is readily mobilized to groundwater and surface water by rainwater or irrigation of selenium rich soils and bedrock [43][44]. Dissolved nitrate has been found to inhibit reduction of Se in groundwater which leads to high concentrations of Se in groundwater [44][45].…”

Section: Agriculturementioning

confidence: 99%

“…Selenium is readily mobilized to groundwater and surface water by rainwater or irrigation of selenium rich soils and bedrock [43][44]. Dissolved nitrate has been found to inhibit reduction of Se in groundwater which leads to high concentrations of Se in groundwater [44][45]. Se enriched water is sometimes used for irrigation of farmlands which could lead to Se enrichment of soils.…”

Section: Agriculturementioning

confidence: 99%

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Selenium in the Soil-Plant Environment: A Review

Saha¹

2017

IJAAS

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Selenium (Se) exhibits a "double-edged" behavior in animal and human nutrition. It is a micronutrient required in low concentrations by animals and humans, but toxic at high concentrations. Selenium deficiency has been associated with cancer and other health problems. Selenium requirements are commonly met through soils and plants such as wheat, rice, vegetables and maize in many countries. Selenium concentration in the soil generally ranges from 0.01-2.0 mg kg-1 but seleniferous soils usually contain more than 5 mg kg-1. Seleniferous soils have been reported in Ireland, China, India and USA. Weathering of parent rocks and atmospheric deposition of volcanic plumes are natural processes increasing Se levels in the environment. Anthropogenic sources of Se include irrigation, fertilizer use, sewage sludge and farmyard manure applications, coal combustion and crude oil processing, mining, smelting and waste incineration. Mobility of Se in the soil-plant system largely depends on its speciation and bioavailability in soil which is controlled by pH and redox potential. Plant uptake of Se varies with plant species and Se bioavailability in the soil. The uptake, translocation, transformation, metabolism, and functions of Se within the plant are further discussed in the paper. The release of Se in soils and subsequent uptake by plants has implications for meeting Se requirements in animals and humans.

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“…Selenium (Se) within lakes, wetlands, and estuaries poses a concern because Se exposure may lead to Se bioaccumulation and toxic health effects in wildlife (Lemly, 1985;Lemly, 2002;Ohlendorf et al, 1986;Presser, 1994).Se presence in natural waters may arise from natural sources such as erosion from seleniferous soils or ores, or from anthropogenic inputs such as deposition from combustion or waste disposal from petroleum processing (Lemly, 2004;Mast et al, 2014;Tuttle et al, 2014).…”

Section: Introductionmentioning

confidence: 99%

Oxygen kinetic isotope effects in selenate during microbial reduction

Schellenger

Onnis‐Hayden

Jaisi

et al. 2015

Applied Geochemistry

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The redox cycling of selenium oxyanions, elemental selenium, and selenides within water resources has implications for Se bioavailability and ecotoxicity. Dual stable isotope analysis of Se and O may provide important information for interpreting environmental Se transformations. Stable Se isotope systematics within the Se redox cycle has been well characterized within the literature, however concomitant oxygen isotope composition requires additional investigation. This study reports the O isotope fractionation of selenate (SeO 4 2-) during microbial reduction by the dissimilatory Sereducing bacterium Sulfurospirillum barnesii SES-3. Microbial reduction experiments were conducted under various conditions in order to investigate the range of 18 O enrichment factors ( O) in selenate. The reduction of selenate to selenite coupled to the oxidation of lactate to acetate resulted in an 18 O kinetic isotope effect with  O values 1.5-5.8 ‰. Greater 18 O enrichment was observed with increasing pH, but no correlation was found between  O and reduction rates, lactate availability, or cell density.  O values from biotic reduction by S. barnesii here are significantly less than those observed for abiotic reduction with Fe(II)-rich minerals reported in the literature, and this difference could be explained by a diffusion limitation during enzymatic reduction. Our results expand the isotope systematics of the selenium redox cycle and suggest  O has potential usefulness as indicators for in situ selenate reduction.

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Mobilization of selenium from the Mancos Shale and associated soils in the lower Uncompahgre River Basin, Colorado

Cited by 29 publications

References 31 publications

Is there a geomorphic expression of interbasin groundwater flow in watersheds? Interactions between interbasin groundwater flow, springs, streams, and geomorphology

Is there a geomorphic expression of interbasin groundwater flow in watersheds? Interactions between interbasin groundwater flow, springs, streams, and geomorphology

Selenium in the Soil-Plant Environment: A Review

Oxygen kinetic isotope effects in selenate during microbial reduction

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