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Enhanced Phosphorus Characterization in Soil with DUV Raman Microspectroscopy

Explore the innovative technique of Deep Ultraviolet Raman Microspectroscopy for precise characterization of phosphorus in soil. Learn about the advantages, disadvantages, theory, and enhancements of DUV Raman Microspectroscopy, along with insights on detecting P-phases and future outlook.

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Enhanced Phosphorus Characterization in Soil with DUV Raman Microspectroscopy

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  1. 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 andTesting, Berlin, Germany Paul-Drude-Institut, Berlin, Germany

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

  3. 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.

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

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

  6. 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

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

  8. Advantages and Disadvantages of DUV Raman Microspectroscopy • Advantages: • 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

  9. 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

  10. 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

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