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Combining diffusive gradients in thin films (DGT) and spectroscopic techniques for the determination of phosphorus species in soils

Vogel, Christian; Sekine, Ryo; Steckenmesser, Daniel; Lombi, Enzo; Herzel, Hannes; Zuin, Lucia; Wang, Dongniu; Félix, Roberto; Adam, Christian. 2019 Combining diffusive gradients in thin films (DGT) and spectroscopic techniques for the determination of phosphorus species in soils. Analytica Chimica Acta, 1057. 80-87. https://doi.org/10.1016/j.aca.2019.01.037

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Abstract/Summary

A wide range of methods are used to estimate the plant-availability of soil phosphorus (P). Published research has shown that the diffusive gradients in thin films (DGT) technique has a superior correlation to plant-available P in soils compared to standard chemical extraction tests. In order to identify the plant-available soil P species, we combined DGT with infrared and P K- and L2,3-edge X-ray adsorption near-edge structure (XANES) spectroscopy. This was achieved by spectroscopically investigating the dried binding layer of DGT devices after soil deployment. All three spectroscopic methods were able to distinguish between different kinds of phosphates (poly-, trimeta-, pyro- and orthophosphate) on the DGT binding layer. However, infrared spectroscopy was most sensitive to distinguish between different types of adsorbed inorganic and organic phosphates. Furthermore, intermediates of the time-resolved hydrolysis of trimetaphosphate in soil could be analyzed.

Item Type: Publication - Article
Digital Object Identifier (DOI): https://doi.org/10.1016/j.aca.2019.01.037
UKCEH and CEH Sections/Science Areas: Pollution (Science Area 2017-)
ISSN: 0003-2670
Additional Keywords: phosphorus plant-availability, X-ray adsorption near-edge structure (XANES) spectroscopy, infrared spectroscopy, diffusive gradients in thin films (DGT)
NORA Subject Terms: Agriculture and Soil Science
Chemistry
Date made live: 27 Mar 2019 15:20 +0 (UTC)
URI: http://nora.nerc.ac.uk/id/eprint/522696

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