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Calhoun CZO - Soil Geochemistry - Mössbauer spectroscopy (2015)

Soil depth: Enriched Fe horizon

Variables:  Velocity (mm/s), intensity (counts)

Date Range:  (2015-2015)

Dataset Creators/Authors:  Aaron Thompson; Dan Richter; Jared Wilmoth; Diego Barcellos

Contact:  Aaron Thompson, University of Georgia, AaronT@uga.edu; 706-410-1293

Field Area:   Calhoun Long-Term Soil-Ecosystem Plots and Reference Areas

Description
Keywords & XML
Citation
Publications
  • Description

    Soil samples analyzed via Mössbauer spectroscopy at three temperatures (295K, 77K and 4.2K). In each case the sample is loaded into the machine without prior modification (no grinding) to an ideal thickness based on the amount of iron in the sample. Transmission 57Fe Mössbauer spectroscopy was performed with a variable temperature He-cooled system with a 1024 channel detector. A 57Co source (~50 mCi) embedded in a Rh matrix was used at room temperature. Samples were mounted between two pieces of 0.127 mm thickness Kapton tape. In some cases, this was done inside an anoxic glovebox, and transferred immediately to the spectrometer cryostat to avoid sample oxidation prior to analysis. In other cases dried samples were used. The velocity (i.e., gamma-ray energy) was calibrated using α-Fe foil at 298 K. The transducer was operated in constant acceleration mode and folding was performed against the calibrated Fe foil to achieve a flat background. The raw sample files here are folded spectra using the most recent collected calibration standard. Data collection times are typically 24 h per sample per temperature, however can be longer/shorter in samples with less/more iron concentration.
    Comments
    Soil samples of enriched and depleted iron horizons were collected previously by Dan Richter and passed to Aaron Thompson in 2015. Each sample was previously air-dried. Dried samples were loaded into the Mössbauer spec. at the University of Georgia, located in Barrow Hall on the main Athens campus and each sample was analyzed for ~24h at three temperatures (295K, 77K and 4.2K). Samples from the upper two horizons did not have sufficient iron to collect quality spectrum.
  • Keywords

    Iron, soil, Calhoun

    XML Metadata

    criticalzone.org/national/data/xml-metadata-test/4678/

    XML is in ISO-19115 geographic metadata format, compatible with ESRI Geoportal Server.

  • Citation for This Dataset

    Aaron Thompson, Dan Richter, Jared Wilmoth, Diego Barcellos, 2015, Mössbauer spectroscopy of Enriched Fe horizon of Calhoun historic soil pits, http://criticalzone.org/calhoun/data/dataset/4678/

    Citation for This Webpage

    Aaron Thompson; Dan Richter; Jared Wilmoth; Diego Barcellos (2015). "CZO Dataset: Calhoun CZO - Soil Geochemistry (2015) - Mössbauer spectroscopy." Retrieved 19 Feb 2019, from http://criticalzone.org/national/data/dataset/4678/

  • Publications

    Primary Publications

    2015

    Depth Variation of Soil Iron Crystallinity at the Calhoun Critical Zone Observatory. Thompson A, Barcellos D, Wilmoth J, & Richter D (2015): Goldschmidt Conference, Prague, CZ

    2015

    Depth Variation of Soil Iron Crystallinity at the Calhoun Critical Zone Observatory. Thompson, A., Barcellos, D., Wilmoth, J., and Richter, D. (2015): Calhoun CZO 2015 Summer Science Meeting

Data

Calhoun historic soil pits - Soil Iron - Mössbauer spectra

(.zip)   Data Level 1,  [Private]

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