期刊
JOURNAL OF SYNCHROTRON RADIATION
卷 21, 期 -, 页码 235-241出版社
INT UNION CRYSTALLOGRAPHY
DOI: 10.1107/S160057751303083X
关键词
full spectral XANES imaging; microfocus diffraction mapping; earthworm granules
资金
- Diamond Light Source [SP7755, NT3895]
The use of fluorescence full spectral micro-X-ray absorption near-edge structure (mu XANES) mapping is becoming more widespread in the hard energy regime. This experimental method using the Ca K-edge combined with micro-X-ray diffraction (mu XRD) 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, mu XRD and mu XANES, probe different sample volumes but there is good agreement in the phase maps produced.
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