Importance of atmospheric inputs and Fe-oxides in controlling soil uranium budgets and behavior along a Hawaiian chronosequence. Pett-Ridge, J. C., Monastra, V. M., Derry, L. A., & Chadwick, O. A. Chemical Geology, 244(3-4):691–707, October, 2007. ![Importance of atmospheric inputs and Fe-oxides in controlling soil uranium budgets and behavior along a Hawaiian chronosequence [link]](https://bibbase.org/img/filetypes/link.svg "link")
Paper doi abstract bibtex A long-term budget of uranium calculated for a chronosequence of Hawaiian soils demonstrates the importance of mineral aerosol deposition as a geochemical pathway. A series of sequential extractions on the same soils shows a strong association between Fe-oxides and uranium, especially the amorphous and poorly-crystalline Fe-oxides present in intermediate-age soils (20 and 150 ka). Despite intense leaching conditions, soil U contents were found to increase between 20-fold and 60-fold with age along the chronosequence, from 9 to 17 μg cm− 2 at 0.3 ka sites to 344–543 μg cm− 2 at the 4100 ka site. An open-system transport function comparing U to an index “least mobile” element (Nb) was used to calculate U gains or losses from the soils, relative to the input from parent material weathering. Results show small losses or small gains (±25%) of U occurred in soils 150 ka and younger, while gains of up to 531% U occurred in soils older than 150 ka, highlighting the importance of mineral aerosol (dust) deposition at the older sites. In the 4100 ka soil, the ratio of dust-derived U inputs to parent material-derived U inputs is approximately 6. Sequential extractions show that between 0.1% and 1.2% of the total U in the soils was extracted with ammonium acetate, indicating that very little U exists as exchangeable cations. A second extraction employing citrate–dithionate and hydroxylamine hydrochloride was performed to extract U associated with Fe-oxides. Average percent occurrences for U in the Fe-oxide extraction for each profile are, 7% at 0.3 ka, 53% at 20 ka, 40% at 150 ka, and 17% at 4100 ka, illustrating an increase with age to 20 ka followed by a subsequent decline. This parallels the trend observed in amorphous Fe-oxide content, suggesting that adsorption on amorphous Fe-oxides is the dominant control on U in the intermediate-age soils.
@article{pett-ridge_importance_2007,
title = {Importance of atmospheric inputs and {Fe}-oxides in controlling soil uranium budgets and behavior along a {Hawaiian} chronosequence},
volume = {244},
copyright = {https://www.elsevier.com/tdm/userlicense/1.0/},
issn = {00092541},
url = {https://linkinghub.elsevier.com/retrieve/pii/S0009254107003452},
doi = {10.1016/j.chemgeo.2007.07.016},
abstract = {A long-term budget of uranium calculated for a chronosequence of Hawaiian soils demonstrates the importance of mineral aerosol deposition as a geochemical pathway. A series of sequential extractions on the same soils shows a strong association between Fe-oxides and uranium, especially the amorphous and poorly-crystalline Fe-oxides present in intermediate-age soils (20 and 150 ka). Despite intense leaching conditions, soil U contents were found to increase between 20-fold and 60-fold with age along the chronosequence, from 9 to 17 μg cm− 2 at 0.3 ka sites to 344–543 μg cm− 2 at the 4100 ka site. An open-system transport function comparing U to an index “least mobile” element (Nb) was used to calculate U gains or losses from the soils, relative to the input from parent material weathering. Results show small losses or small gains (±25\%) of U occurred in soils 150 ka and younger, while gains of up to 531\% U occurred in soils older than 150 ka, highlighting the importance of mineral aerosol (dust) deposition at the older sites. In the 4100 ka soil, the ratio of dust-derived U inputs to parent material-derived U inputs is approximately 6. Sequential extractions show that between 0.1\% and 1.2\% of the total U in the soils was extracted with ammonium acetate, indicating that very little U exists as exchangeable cations. A second extraction employing citrate–dithionate and hydroxylamine hydrochloride was performed to extract U associated with Fe-oxides. Average percent occurrences for U in the Fe-oxide extraction for each profile are, 7\% at 0.3 ka, 53\% at 20 ka, 40\% at 150 ka, and 17\% at 4100 ka, illustrating an increase with age to 20 ka followed by a subsequent decline. This parallels the trend observed in amorphous Fe-oxide content, suggesting that adsorption on amorphous Fe-oxides is the dominant control on U in the intermediate-age soils.},
language = {en},
number = {3-4},
urldate = {2025-07-02},
journal = {Chemical Geology},
author = {Pett-Ridge, Julie C. and Monastra, Valerie M. and Derry, Louis A. and Chadwick, Oliver A.},
month = oct,
year = {2007},
pages = {691--707},
}
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A series of sequential extractions on the same soils shows a strong association between Fe-oxides and uranium, especially the amorphous and poorly-crystalline Fe-oxides present in intermediate-age soils (20 and 150 ka). Despite intense leaching conditions, soil U contents were found to increase between 20-fold and 60-fold with age along the chronosequence, from 9 to 17 μg cm− 2 at 0.3 ka sites to 344–543 μg cm− 2 at the 4100 ka site. An open-system transport function comparing U to an index “least mobile” element (Nb) was used to calculate U gains or losses from the soils, relative to the input from parent material weathering. Results show small losses or small gains (±25%) of U occurred in soils 150 ka and younger, while gains of up to 531% U occurred in soils older than 150 ka, highlighting the importance of mineral aerosol (dust) deposition at the older sites. In the 4100 ka soil, the ratio of dust-derived U inputs to parent material-derived U inputs is approximately 6. Sequential extractions show that between 0.1% and 1.2% of the total U in the soils was extracted with ammonium acetate, indicating that very little U exists as exchangeable cations. A second extraction employing citrate–dithionate and hydroxylamine hydrochloride was performed to extract U associated with Fe-oxides. Average percent occurrences for U in the Fe-oxide extraction for each profile are, 7% at 0.3 ka, 53% at 20 ka, 40% at 150 ka, and 17% at 4100 ka, illustrating an increase with age to 20 ka followed by a subsequent decline. This parallels the trend observed in amorphous Fe-oxide content, suggesting that adsorption on amorphous Fe-oxides is the dominant control on U in the intermediate-age soils.","language":"en","number":"3-4","urldate":"2025-07-02","journal":"Chemical Geology","author":[{"propositions":[],"lastnames":["Pett-Ridge"],"firstnames":["Julie","C."],"suffixes":[]},{"propositions":[],"lastnames":["Monastra"],"firstnames":["Valerie","M."],"suffixes":[]},{"propositions":[],"lastnames":["Derry"],"firstnames":["Louis","A."],"suffixes":[]},{"propositions":[],"lastnames":["Chadwick"],"firstnames":["Oliver","A."],"suffixes":[]}],"month":"October","year":"2007","pages":"691–707","bibtex":"@article{pett-ridge_importance_2007,\n\ttitle = {Importance of atmospheric inputs and {Fe}-oxides in controlling soil uranium budgets and behavior along a {Hawaiian} chronosequence},\n\tvolume = {244},\n\tcopyright = {https://www.elsevier.com/tdm/userlicense/1.0/},\n\tissn = {00092541},\n\turl = {https://linkinghub.elsevier.com/retrieve/pii/S0009254107003452},\n\tdoi = {10.1016/j.chemgeo.2007.07.016},\n\tabstract = {A long-term budget of uranium calculated for a chronosequence of Hawaiian soils demonstrates the importance of mineral aerosol deposition as a geochemical pathway. A series of sequential extractions on the same soils shows a strong association between Fe-oxides and uranium, especially the amorphous and poorly-crystalline Fe-oxides present in intermediate-age soils (20 and 150 ka). Despite intense leaching conditions, soil U contents were found to increase between 20-fold and 60-fold with age along the chronosequence, from 9 to 17 μg cm− 2 at 0.3 ka sites to 344–543 μg cm− 2 at the 4100 ka site. An open-system transport function comparing U to an index “least mobile” element (Nb) was used to calculate U gains or losses from the soils, relative to the input from parent material weathering. Results show small losses or small gains (±25\\%) of U occurred in soils 150 ka and younger, while gains of up to 531\\% U occurred in soils older than 150 ka, highlighting the importance of mineral aerosol (dust) deposition at the older sites. In the 4100 ka soil, the ratio of dust-derived U inputs to parent material-derived U inputs is approximately 6. Sequential extractions show that between 0.1\\% and 1.2\\% of the total U in the soils was extracted with ammonium acetate, indicating that very little U exists as exchangeable cations. A second extraction employing citrate–dithionate and hydroxylamine hydrochloride was performed to extract U associated with Fe-oxides. Average percent occurrences for U in the Fe-oxide extraction for each profile are, 7\\% at 0.3 ka, 53\\% at 20 ka, 40\\% at 150 ka, and 17\\% at 4100 ka, illustrating an increase with age to 20 ka followed by a subsequent decline. 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