Infrared spectroscopy of diffusive gradients in thin films (DGT) binding layer
Source: BAM, Division Thermochemical Residues Treatment and Resource Recovery
A variety of methods to estimate the plant-availability phosphorus (P) in soil are at hand. However, these techniques do not identify those P species that are actually plant-available. The literature reveals that the diffusive gradients in thin films (DGT) technique provides superior correlation to plant-available P in soils over standard chemical extraction tests. The plant-available soil P species were identified using a combination of DGT with infrared and X-ray adsorption near-edge structure (XANES) spectroscopy, respectively. For this purpose, the dried binding layer of DGT devices after soil deployment spectroscopically investigated. All three spectroscopic techniques allowed distinguishing between different 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. In addition, intermediates formed during the time-resolved hydrolysis of trimetaphosphate in soil could be identified.
Combining diffusive gradients in thin films (DGT) and spectroscopic techniques for the determination of phosphorus species in soils
Christian Vogel, R. Sekine, D. Steckenmesser, E. Lombi, Hannes Herzel, L. Zuin, D. Wang, R. Felix, Christian Adam
pubished in Analytica Chimica Acta, 2019, Volume 1057, pages 80 - 87
BAM Division Inorganic Trace Analysis and Division Thermochemical Residues Treatment and Resource Recovery