Micro-X-ray fluorescence

Fluorescence, 3 256 22 716. See also EDXRF instruments Micro X-ray fluorescence (MXRF) analysis Total reflection X-ray fluorescence spectrometry micro X-ray, 26 437-439 Raman scattering and, 21 324, 325 sensors using, 22 271... 

Bronk, H., Rohrs, S., Bjeoumikhov, N., et al. (2001). ArtTAX- a new mobile spectrometer for energy-dispersive micro X-ray fluorescence spectrometry on art and archaeological objects. Fresenius Journal of Analytical Chemistry 371 307-316. 

Link, D.D., H.M. Kingston, G.J. Havrilla, and L.P. Coletti. 2002. Development of microwave-assisted drying methods for sample preparation for dried spot micro-X-ray fluorescence analysis. Anal. Chem. 74 1165-1170. 

Gholap D, Izmer A, Samber B, van Elteren J, Selih V, Evens R, Schamphelaere K, Janssen C, Balcaen L, Lindemann I, Vincze L, Vanhaecke F (2010) Comparison of laser ablation-induc-tively coupled plasma-mass spectrometry and micro-X-ray fluorescence spectrometry for elemental imaging. Anal Chim Acta 664 19-26. doi 10.1016/j.aca.2010.01.052... 

Micro SXRF (Synchrotron-based micro-X-ray fluorescence) spectroscopy is an excellent tool to study elemental distributions on microscopic level. This method helps to understand the role of particular minerals in sorption properties of complex mineral assemblies. Iron and managanese oxide phases were detected in polished thin sections of natural zeolitic tuff by SXRF. This section was contacted with synthetic ground water containing Pu(V), and Pu was found to be predominantly associated with manganese oxide, but not with hematite [41]. Micro SXRF can be combined with micro-XANES, and micro-EXAFS to determine the oxidation state and coordination environment of Pu adsorbed at different regions of the tuff [42]. 

Marcus etal. (2004) have studied the speciationof Mn, Fe, Zn and As in one of the Baltic Sea concretions described by Hlawatsch et al. (2002) by means of micro X-ray fluorescence, micro X-ray diffraction and micro X-ray spectroscopy. The concretion was shown to consist of thin, alternating Fe- and Mn-rich layers. The Fe-rich layers consisted of two-line ferrihydrite in which As was mostly pentavalent and the Mn-rich layers consisted of birnessite in which Zn is tetrahedrally coordinated and soibed in the interlayers of birnessite. The occurrence of 15% of As(lll) in Fe-rich layers and of-15% Mrf+ in Mn-rich layers was thought to reflect the stagnation of the bottom waters at the time of the deposition of the Fe- and Mn-rich layers. 

MW molecular weight MXRF micro X-ray fluorescence spectrometry (also micro-XRF, JrXRF) mycorrhiza fungi fungi living in soil in close contact with plant roots (symbiosis, nutrient exchange)... 

In this chapter we first provide an overview of eommonly applied synchrotron radiation-based X-ray techniques for determining metal speciation in powdered samples, including X-ray absorption spectroscopy, micro X-ray fluorescence, and micro X-ray diffraction (XRD). The seeond part of this ehapter will provide an example of the application of these teehniques to an investigation of lead (Pb) speciation in a house dust sample, characterized by elevated total and bioaccessible Pb concentrations. 

Micro-X-Ray Fluorescence Analysis as an Accurate Method of Microanalysis... 

Multiphoton ionisation, c/r. MPI Microwave thermal analysis Microsample X-ray analysis Micro X-ray fluorescence (c/r fiXRF)... 

Menzel M, Schlifke A, Falk M et al (2013) Surface and in-depth characterization of lithium-ion battery cathodes at different cycle states using confocal micro-X-ray fluorescence-X-ray absorption near edge stmcture analysis. Spectrochim Acta Part B At Spectrosc 85 62-70. doi 10.1016/j.sab.2013.04.001... 

Boesenberg U, Falk M, Fittschen UFA et al (2015) Correlation between chemical and morphological heterogeneities in LiNio,5Mni,504 spinel composite electrodes for lithium-ion batteries determined by Micro-X-ray Fluorescence Analysis, Chemistry of Materials, doi 10. 1021 /acs. chemmater. 5b00119... 

The combination of XRF with electrophoresis can constitute a quasi-on-line coupling technique. Great efforts have been made to develop on-line analysis techniques with XRF. Mann et reported a technique of on-line SRXRF detection of metal ions, such as Fe, Co, Cu, and Zn, in their high binding-constant complexes for capillary electrophoresis (CE) separation. An X-ray transparent polymer coupling is used to create a window for the on-line X-ray detection. In contrast to ICP-MS, this detection technique is not limited by sample or the buffer volatility or atomization efficiency. Simultaneous XRF and UV absorbance detection can be used to provide on-line determination of metal/chelate ratios. A bench-top energy-dispersive micro X-ray fluorescence system was also combined with the CE apparatus constructed by a thin-walled fused-silica capillary for elemental analysis of the species containing Fe, Co, and Cu, for example. This coupled technique used for metalloprotein speciation analysis can avoid the compromise between optimal separation and sensitive detection, which must be taken into account in the HPLC-ICP-MS procedure. In addition, this detection scheme is non-destructive, so the separated material can be recovered for additional characterization. 

Carpenter DA (ed) (1997) Special Issue on Micro X-ray Fluorescence Analysis. X-ray Spectrometry 26(6) ... 

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