Abstract
Environmental samples are extremely diverse but share a tendency for heterogeneity and complexity. This heterogeneity poses methodological challenges when investigating biogeochemical processes. In recent years, the development of analytical tools capable of probing element distribution and speciation at the microscale have allowed this challenge to be addressed. Of these available tools, laterally resolved synchrotron techniques such as X-ray fluorescence mapping are key methods for the in situ investigation of micronutrients and inorganic contaminants in environmental samples. This article demonstrates how recent advances in X-ray fluorescence detector technology are bringing new possibilities to environmental research. Fast detectors are helping to circumvent major issues such as X-ray beam damage of hydrated samples, as dwell times during scanning are reduced. They are also helping to reduce temporal beamtime requirements, making particularly time-consuming techniques such as micro X-ray fluorescence (μXRF) tomography increasingly feasible. This article focuses on μXRF mapping of nutrients and metalloids in environmental samples, and suggests that the current divide between mapping and speciation techniques will be increasingly blurred by the development of combined approaches.
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Acknowledgements
The authors would like to thank Mark Rivers (University of Chicago) and Stefan Vogt (Argonne National Laboratory) for the discussion of developments at the Advanced Photon Source, Argonne, IL, USA. Some of the research presented here was undertaken on the X-ray fluorescence microscopy beamline at the Australian Synchrotron, Victoria, Australia. Further synchrotron installations of Maia are anticipated; for more information, please contact C.G.R. (chris.ryan@csiro.au). E.L. gratefully acknowledges financial support by FT100100337 (Australian Research Council Future Fellowship).
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Lombi, E., de Jonge, M.D., Donner, E. et al. Trends in hard X-ray fluorescence mapping: environmental applications in the age of fast detectors. Anal Bioanal Chem 400, 1637–1644 (2011). https://doi.org/10.1007/s00216-011-4829-2
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DOI: https://doi.org/10.1007/s00216-011-4829-2