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

Journal of Synchrotron Radiation
Loredana BrinzaJ Frederick W Mosselmans

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.

References

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Citations

May 17, 2019·Journal of Environmental Science and Health. Part. B, Pesticides, Food Contaminants, and Agricultural Wastes·Paulo R Dores-SilvaMaria O O Rezende
Jun 24, 2015·Journal of Speech, Language, and Hearing Research : JSLHR·Supraja Anand, Cara E Stepp
Jul 7, 2018·Journal of Synchrotron Radiation·Sofia Diaz-MorenoStephen A Parry
Jan 22, 2021·ACS Applied Materials & Interfaces·Adriana Matamoros-VelozaAnne Neville

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Methods Mentioned

BETA
X-ray
PCA

Software Mentioned

Python
Athena
Dawn
Igor Pro
Mantis
Nexus
PyMCA
Axis2000
Nika
XANES

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