CCZO -- Soil Geochemistry -- Mössbauer spectroscopy -- Calhoun CZO -- (2015)

OVERVIEW

Description/Abstract

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.

Creator/Author

Thompson, Aaron|Richter, Daniel deB.|Wilmoth, Jared|Barcellos, Diego

CZOs

Calhoun

Contact

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

Subtitle

Soil depth: Enriched Fe horizon

SUBJECTS

Disciplines

Biogeochemistry|Soil Science / Pedology

Topics

Soil Geochemistry

Subtopic

Mössbauer spectroscopy

Keywords

Iron|soil|Calhoun

Variables

Velocity (mm/s)|intensity (counts)

Variables ODM2

Iron Fractionation|Velocity

TEMPORAL

Date Start

2015-05-01

Date End

2015-12-31

SPATIAL

Field Areas

Calhoun Long-Term Soil-Ecosystem Plots and Reference Areas

Location

Calhoun CZO

North latitude

34.60803

South latitude

34.60803

West longitude

-81.722091

East longitude

-81.722091

REFERENCE

Publications of this data

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

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

CZO ID

4678

COMMENTS

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.