Sequential Separation of Uranium, Hafnium and Neodymium from Natural Waters Concentrated by Iron Coprecipitation

Arendt, Carli A.; Aciego, S.; Sims, Kenneth W.W.; Robbins, Mark J.

doi:10.1111/j.1751-908x.2014.00322.x

Cited by 26 publications

(13 citation statements)

References 28 publications

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“…Interference corrections to 176 Hf/ 177 Hf were <100 μg g −1 . Bracketing measurements of the Hf standard JMC475 were run between every sample, averaging 176 Hf/ 177 Hf=0.282115±0.000008 (2 s.d., n =83), which is in agreement with the prior measurements376270; all samples were normalized to JMC475 176 Hf/ 177 Hf=0.282160. The 176 Hf/ 177 Hf of BCR-2 and AGV-2 were in agreement with the literature values66.…”

Section: Methodssupporting

confidence: 78%

“…Isotopic ratios were measured using a Thermo-Finnigan Neptune Multicollector Inductively Coupled Mass Spectrometer (MC-ICPMS) in the Department of Geology & Geophysics at the University of Wyoming as described elsewhere70. Instrumental mass bias was corrected for by applying an exponential mass fractionation law with the 179 Hf/ 177 Hf=0.7325 and masses 182, 175 and 172 were monitored for W, Lu and Yb interferences.…”

Section: Methodsmentioning

confidence: 99%

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Dust outpaces bedrock in nutrient supply to montane forest ecosystems

et al. 2017

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Dust provides ecosystem-sustaining nutrients to landscapes underlain by intensively weathered soils. Here we show that dust may also be crucial in montane forest ecosystems, dominating nutrient budgets despite continuous replacement of depleted soils with fresh bedrock via erosion. Strontium and neodymium isotopes in modern dust show that Asian sources contribute 18–45% of dust deposition across our Sierra Nevada, California study sites. The remaining dust originates regionally from the nearby Central Valley. Measured dust fluxes are greater than or equal to modern erosional outputs from hillslopes to channels, and account for 10–20% of estimated millennial-average inputs of bedrock P. Our results demonstrate that exogenic dust can drive the evolution of nutrient budgets in montane ecosystems, with implications for predicting forest response to changes in climate and land use.

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Section: Methodssupporting

confidence: 78%

Section: Methodsmentioning

confidence: 99%

Dust outpaces bedrock in nutrient supply to montane forest ecosystems

et al. 2017

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“…This water sample was acidified to pH 2 with single-distilled concentrated HNO 3 . Water samples for uranium isotope analysis were collected following the procedure outlined in Arendt et al (2015). A pre-cleaned 15 L plastic water carrier was filled with 0.2 µm filtered water (filtered using a polycarbonate vacuum filtration unit connected to a hand pump), then 7 mL 9M HCl was added to the water followed by 3 mL of a pre-cleaned iron solution (FeCl 3 .6H 2 O in 3M HCl), resulting in an Fe concentration of 15 mg/L.…”

Section: Water Samplingmentioning

confidence: 99%

Li and U Isotopes as a Potential Tool for Monitoring Active Layer Deepening in Permafrost Dominated Catchments

2018

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Permafrost in the Arctic is decreasing in extent and the depth of the seasonally thawed layer, the active layer, is increasing. Increased exposure to water is increasing fluxes of organic and inorganic solutes with potential impacts for the global carbon cycle and downstream ecosystems. Understanding the relationship between solute release and active layer depth will be critical for modeling environmental impact, especially in inaccessible regions where there is a lack of data. In this study, we focus on the potential for the isotopes of lithium (Li) and uranium (U) to track active layer extent in two permafrost-dominated catchments in Svalbard: one glaciated and one unglaciated. These isotope systems can be measured to a much higher precision than concentration measurements and act as sensitive tracers of environmental change. The extent of Li isotope fractionation provides information on the balance between dissolution of primary phases and formation of secondary phases, such as clay minerals and oxides. The U activity ratio provides information on water-rock interaction times and physical properties. We observe contrasting behavior between the two catchments. The highest U activity ratios and Li isotope values (those most distinct from bedrock) are observed in summer in the unglaciated catchment, when the active layer depth is expected to be at its maximum extent, whereas negligible seasonal variation and the lowest values are observed in the glaciated catchment. We therefore propose that the extent of solute acquisition is directly linked to the active layer depth, which is restricted in the glaciated catchment due to a layer of "dead ice" underneath the glacial outwash plain, and could therefore provide a valuable tool to assess changes in active layer depth at catchment scales.

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“…Coupled Plasma Mass Spectrometer (MC-ICP-MS) as detailed in Arendt et al (2014). During 303 analysis, instrumental mass fractionation was corrected using 179 Hf/ 177 Hf = 0.7325 and the exponential fractionation law and masses 182, 175, and 172 were monitored for W, Lu and Yb interferences.…”

Section: Hafnium Radiogenic Isotope Analysesmentioning

confidence: 99%

A Sr-Nd-Hf isotope characterization of dust source areas in Victoria Land and the McMurdo Sound sector of Antarctica

Blakowski

Aciego

Delmonte

et al. 2016

Quaternary Science Reviews

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Determining the geographical provenance of dust provides crucial insight into the global dust cycle. For the East Antarctic Ice Sheet (EAIS), the importance of Southern hemisphere potential dust sources has been thoroughly investigated using radiogenic isotopes, whereas proximal dust source areas located on the periphery of the ice sheet remain poorly documented from a geochemical standpoint. In this work, we expand the existing isotopic (Srsingle bondNd) catalogue of dust and sand-sized sediments from Victoria Land and the McMurdo Sound sector, and incorporate Hf isotopic data to place additional constraints on dust source identification. The isotopic field for materials considered in this study is characterized by 87Sr/86Sr ratios ranging from 0.703 to 0.783, εNd between −12.01 and 6.36, and εHf from −16.77 to 6.89. As reported in previous works, the data reveal close relationships between Antarctic sediments and distinct parent lithologies; in addition, our findings emphasize the background presence of very fine dusts originating from dominant global sources and regional volcanic activity as barriers to direct source-to-sink comparison of isotopic signatures. Thus, geochemical characterizations of dust sources to the Antarctic ice sheet involving multiple size fractions, including coarser-grained particles more susceptible to short-range transport, can help us to rule out global sources of dust when examining local sediment cores and ice cores

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Sequential Separation of Uranium, Hafnium and Neodymium from Natural Waters Concentrated by Iron Coprecipitation

Cited by 26 publications

References 28 publications

Dust outpaces bedrock in nutrient supply to montane forest ecosystems

Dust outpaces bedrock in nutrient supply to montane forest ecosystems

Li and U Isotopes as a Potential Tool for Monitoring Active Layer Deepening in Permafrost Dominated Catchments

A Sr-Nd-Hf isotope characterization of dust source areas in Victoria Land and the McMurdo Sound sector of Antarctica

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