Combining μXANES and μXRD mapping to analyse the heterogeneity in calcium carbonate granules excreted by the earthworm Lumbricus terrestris
Combining μXANES and μXRD mapping to analyse the heterogeneity in calcium carbonate granules excreted by the earthworm Lumbricus terrestris
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DOI：
10.1107/s160057751303083x
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发表时间：
2014-01-01
影响因子：
2.5
通讯作者：
Mosselmans, J. Frederick W.
中科院分区：
文献类型：
--
作者：
Brinza, Loredana;Schofield, Paul F.;Mosselmans, J. Frederick W.
荧光全光谱微X射线吸收近边结构（mu XANES）映射的使用在硬能区中变得越来越普遍。该实验方法使用Ca K边缘结合相同样品的微X射线衍射（mu XRD）绘图，已经在金刚石光源的光束线I18上实现。这种结合的方法已被用来探测由蚯蚓terrestris产生的碳酸钙颗粒的长程和短程顺序。在对照人工土壤中培养的蚯蚓产生的颗粒中，在颗粒中观察到方解石和球霰石。然而，在用500 ppm Mg改良的相同人工土壤中培养的蚯蚓产生的颗粒也含有文石。这两种技术，mu XRD和mu XANES，探测不同的样品体积，但有很好的协议，在所产生的相图。
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.