Christian Vogel, Manfred Ramsteiner and Christian Adam

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Presentation transcript:

Christian Vogel, Manfred Ramsteiner and Christian Adam Deep Ultraviolet Raman Microspectroscopy – Novel Technique for the Characterization of Phosphorus in Soil Christian Vogel, Manfred Ramsteiner and Christian Adam BAM Federal Institute for Materials Research and Testing, Berlin, Germany Paul-Drude-Institut, Berlin, Germany

Deep ultraviolet (DUV) Raman microspectroscopy Introduction Deep ultraviolet (DUV) Raman microspectroscopy Detection of P-Phases in soil Advantages and Disadvantages of DUV Raman microspectroscopy Outlook Conclusions

Deep Ultraviolet (DUV) Raman Microspectroscopy - Theory from Asher, Analytical Chemistry, 1993, 65(2), 59A-66A The electronic resonance enhancement effect can increase the intensity of the scattered light by a factor of 106.

Deep Ultraviolet (DUV) Raman Microspectroscopy – Enhancement Effect UV/VIS Guanosine-5´-monophosphate from Dietzek et al., Chapter 2 in Confocal Raman Microscopy (Springer 2010)

Deep Ultraviolet (DUV) Raman Microspectroscopy - Fluorescence from www.semrock.com/uv-raman-spectroscopy.aspx

DUV Raman Microspectroscopy of an Alluvial Soil Alluvial Soil: pH(H2O) = 7.4; P = 0.36 wt.% Instrument: HORIBA LabRam HR Evolution; Laser: 244 nm (Ar-Ion); Lateral Resolution: 1 µm; Spectral Resolution: 8 cm-1; Time: approx. 1h; Imaged Area: 15 x 15 µm2

AlPO4 (Berlinite) Hydroxyapatite Ca-Phytate Fe-Phytate Na-Phytate 500 DUV Raman Spectra of Different Phosphates AlPO4 (Berlinite) Hydroxyapatite Ca-Phytate Fe-Phytate Na-Phytate 500 1000 1500 2000 Wavenumber (cm-1)

Advantages and Disadvantages of DUV Raman Microspectroscopy Detection of organic and inorganic phosphates High lateral resolution (theoretical down to 150 nm) Almost no samples preparation required No fluorescence appears Disadvantage: Localization of P-phases

Outlook Problem of P Localization Combination with laboratory micro X-ray fluorescence (µ-XRF) µ-XRF Mapping of the Alluvial soil P Kα1 Ca Kα1 Si Kα1 Instrument: HORIBA XGT 7200; Area: 512 x 512 µm2; Lateral Resolution: 10 µm; Time: 5 min

Chemical state of inorganic and organic phosphates is detectable Conclusions Chemical state of inorganic and organic phosphates is detectable by DUV Raman Microspectroscopy Almost no sample pre-treatment is required Combination with µ-XRF make it easier to localize P-phases