A. Herring, OSU, uses tomography at 13 BMD to quantify pore scale trapping and to analyze how mechanisms affect the efficiency of capillary trapping of CO2 in saline aquifers.

Tomography at 13 BMD

Study in 'Science' finds missing piece of biogeochemical puzzle in aquifers using 13-ID-E's sulfur spectroscopy capabilities. Details in Argonne's press release

New paper in Science showcases the new sulfur capabilities at 13 IDE

X-ray diffraction patterns from a diamond anvil cell (DAC).

X-ray diffraction is the most powerful technique for crystal structure determination. From left to right, patterns from a single crystal, polychrystalline, nano-cyrstalline and amorphous crystals.

X-ray diffraction patterns from a diamond anvil cell.

High pressure x-ray tomographic microscopy module

The HPXTM module helps researchers study the texture change of their sample under extreme pressure and temperature conditions by collecting in-situ HP/HT 3D x-ray tomographic images.

High Pressure X-ray Tomographic Microscopy Module sitting outside of the 250 ton press in 13 BMD.

Peter Hong, Python Tomography Data Collection Project; Andrea Bryant, Determination of Cr, Ti, & V Valences in Olivine & Pyroxene from Ureilites; Catherine Eng, Design a Low Cost Inelastic X-ray Scattering Analyzer

GSECARS Summer Students 2014

GSECARS is a national user facility
for frontier research in the earth sciences using synchrotron radiation at the
Advanced Photon Source, Argonne National Laboratory.

GSECARS provides earth scientists with access to the high-brilliance hard x-rays from this third-generation synchrotron light source. All principal synchrotron-based analytical techniques in demand by earth scientists are being brought to bear on earth science problems:

  • High-pressure/high-temperature crystallography and spectroscopy using the diamond anvil cell
  • High-pressure/high-temperature crystallography and imaging using the large-volume press
  • Powder, single crystal and interface diffraction
  • Inelastic x-ray scattering
  • X-ray absorption fine structure spectroscopy
  • X-ray fluorescence microprobe analysis
  • Microtomography 

Science Highlight

"Protection of soil carbon within macro-aggregates depends on intra-aggregate pore characteristics"

Abstract : Soil contains almost twice as much carbon (C) as the atmosphere and 5–15% of soil C is stored in a form of particulate organic matter (POM). Particulate organic matter C is regarded as one of the most labile components of the soil C, such that can be easily lost under the right environmental settings. Conceptually, micro-environmental conditions are understood to be responsible for protection of soil C. However, quantitative knowledge of the specific mechanisms driving micro-environmental effects is still lacking. Researchers from Michigan State University, the Institute for Advanced Sustainability Studies and the University of Chicago have combined CO2 respiration measurements of intact soil samples with X-ray computed micro-tomography imaging and investigated how micro-environmental conditions, represented by soil pores, influence decomposition of POM. It was found that atmosphere-connected soil pores influenced soil C’s, and especially POM’s, decomposition. In presence of such pores losses in POM were 3–15 times higher than in their absence. Moreover, it was demonstrated the presence of a feed-forward relationship between soil C decomposition and pore connections that enhance it. Since soil hydrology and soil pores are likely to be affected by future climate changes, the findings indicate that not-accounting for the influence of soil pores can add another sizable source of uncertainty to estimates of future soil C losses.

The movie above shows an analysis of μCT images of the intact soil samples. Pores with > 13μm equivalent diameter (blue), particulate organic matter (POM) connected by > 13μm pores to the atmosphere (green), and POM not connected to the atmosphere (yellow) identified within an intact soil sample.

Kravchenko, Alexandra N., Wakene C. Negassa, Andrey K. Guber, and Mark L. Rivers. "Protection of soil carbon within macro-aggregates depends on intra-aggregate pore characteristics." Scientific Reports 5 (2015): 16261. DOI: 10.1038/srep16261