Combining µXANES and µXRD mapping to analyse the heterogeneity in calcium carbonate granules excreted by the earthworm

DOI: 10.1107/S160057751303083X
PMID: 24365942

Authors: Loredana Brinza (Diamond Light Source) , Paul Schofield (Natural History Museum) , Mark Hodson (University of York) , Sophie Weller (University of Oxford) , Konstantin Ignatyev (Diamond Light Source) , Tina Geraki (Diamond Light Source) , Paul Quinn (Diamond Light Source) , Fred Mosselmans (Diamond Light Source)
Co-authored by industrial partner: No

Type: Journal Paper
Journal: Journal Of Synchrotron Radiation , VOL 21 , PAGES 235 - 241

State: Published (Approved)
Published: January 2014
Diamond Proposal Number(s): 7755 , 3895

Abstract: The use of fluorescence full spectral micro-X-ray absorption near-edge structure (µXANES) mapping is becoming more widespread in the hard energy regime. This experimental method using the Ca K-edge combined with micro-X-ray diffraction (µXRD) mapping of the same sample has been enabled on beamline I18 at Diamond Light Source. This combined approach has been used to probe both long- and short-range order in calcium carbonate granules produced by the earthworm Lumbricus terrestris. In granules produced by earthworms cultured in a control artificial soil, calcite and vaterite are observed in the granules. However, granules produced by earthworms cultivated in the same artificial soil amended with 500 p.p.m. Mg also contain an aragonite. The two techniques, µXRD and µXANES, probe different sample volumes but there is good agreement in the phase maps produced.

Journal Keywords: Full Spectral Xanes Imaging; Microfocus Diffraction Mapping; Earthworm Granules; Absorption Spectroscopy; Calcium Carbonates; Data Analysis; Diamonds; Fluorescence; Light Sources; Mapping; Probes; Soils; Two-Dimensional Calculations; X Radiation

Subject Areas: Environment, Technique Development, Materials


Instruments: I18-Microfocus Spectroscopy

Documents:
hf5244.pdf