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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)
,
Kalotina
Geraki
(Diamond Light Source)
,
Paul
Quinn
(Diamond Light Source)
,
J. Frederick W.
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:
Earth Science,
Technique Development
Instruments:
I18-Microfocus Spectroscopy
Added On:
19/02/2014 14:22
Documents:
hf5244.pdf
Discipline Tags:
Technique Development - Earth Sciences & Environment
Earth Sciences & Environment
Technical Tags:
Diffraction
Spectroscopy
X-ray Absorption Spectroscopy (XAS)
X-ray Absorption Near Edge Structure (XANES)
microXRD