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Code:
ThP21
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Time Slot/Poster Number:
023
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Session:
Forensics/Geoscience/Environmental Applications
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Behavior of Semi-volatile Particles under a Laser and Electron Beam – Influence on the Quality of Analytical Results
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| Anna Worobiec2; Sanja Potgieter-Vermaak1; Larysa Darchuk2; Herman Potgieter1; Rene Van Grieken2; Vladimir Vishnyakov1
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1Manchester Metropolitan University, Manchester, United Kingdom; 2University of Antwerp, Antwerp, Belgium
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| View Abstract PDF |
| Summary |
The combination of scanning electron microscopy (SEM) equipped with the energy dispersive X-ray detection (EDX) and micro-Raman spectrometry (MRS) for environmental research can give detailed information about individual atmospheric particles. It is very important to not only examine the fundamental analytical requirements of the individual techniques, but also the characteristic behaviour during measurement. One of the main aspects, which needs be taken into account during the analysis of individual particles by combined SEM-EDX/MRS, is particle damage and any subsequent molecular changes that might occur. It is vital that modifications induced by the analytical method employed, be properly understood and controlled.
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Code:
ThP21
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Time Slot/Poster Number:
024
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Session:
Forensics/Geoscience/Environmental Applications
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Conformational Stability Determination From Raman Spectra Of Ethylisocyanate and Cyclopropylisocyanate
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| Sarah Xiaohua Zhou; James Durig
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University of Missouri-Kansas City, Kansas City, MO
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| View Abstract PDF |
| Summary |
Raman and infrared spectra of the gaseous, liquid and/or solid ethylisocyanate and cycloproylisocyanate as well as variable temperature studies of the spectra in liquid xenon and/or liquid krypton have been recorded. Conformational stabilities have been determined, the stable conformer for ethylisocyanate is the cis form and for the cyclopropyl the trans form. These spectroscopic studies have been supported by ab initio calculations from which optimized geometries, conformational stabilities, harmonic force fields, infrared intensities, Raman activities and depolarization ratios have been obtained.
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Code:
ThP21
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Time Slot/Poster Number:
025
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Session:
Forensics/Geoscience/Environmental Applications
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The Influence of Intracellular Storage Material on Bacterial Identification by means of Raman Spectroscopy
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| Valerian Ciobota1; Eva-Maria Burkhardt2; Wilm Schumacher1; Petra Roesch1; Kirsten Kuesel2; Juergen Popp1, 3
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1Institute of Physical Chemistry, Jena, Germany; 2Institute of Ecology, Jena, Germany; 3Institute of Photonic Technology, Jena, Germany
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| View Abstract PDF |
| Summary |
The most common energy storage polymer produced by bacteria is polyhydroxybutyrate (PHB). Since PHB can be accumulated in high amounts within the bacterial cells, it is expected that the Raman signals from the above mentioned substance partially or totally overlap the bands from others cell components. Therefore, a study focused on the effects of PHB on the bacterial identification rates is required.
In our study six strains belonging to five species were investigated. The identification results obtained by means of support vector machines demonstrate that identification of microorganisms which accumulate PHB is achievable. However, some limitations exist.
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Code:
ThP21
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Time Slot/Poster Number:
027
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Session:
Forensics/Geoscience/Environmental Applications
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Foliar Lead Uptake by Lettuce Exposed to Atmospheric Fallouts: Raman Imaging Study
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| Sophie Sobanska1; Gaëlle Uzu2; Myriam Moreau1; Marie Choël1; Camille Dumat2
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1Université de Lille 1, LASIR UMR CNRS 8516, Villeneuve D'ascq, France; 2Université de Toulouse, INPT, UPS, Ecolab, ENSAT, Castanet-Tolosan, France
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| View Abstract PDF |
| Summary |
The present work focuses on the molecular characterization and Raman imaging of the Pb rich areas observed in the leaf surface, in order to better understand the mechanism involved in the foliar transfer of atmospheric Pb rich fallouts at the leaf scale.
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Code:
ThP21
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Time Slot/Poster Number:
028
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Session:
Forensics/Geoscience/Environmental Applications
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Quantitative Model Based on Raman Spectra to Evaluate Contaminants in Crack (Cocaine)
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| Ciro Penido; Marcos T. T. Pacheco; Landulfo Silveira, Jr.
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Universidade Camilo Castelo Branco, Sao Jose Dos Campos, Brazil
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| View Abstract PDF |
| Summary |
Dscrimination between different types of drugs of abuse and purity analysis of these drugs is of vital importance to the public security and forensics in order to check the veracity of the sample. Raman spectroscopy was used to detect the adulteration in crack. Dilutions of 70% crack in lidocaine, sodium carbonate, benzocaine and caffeine were prepared and submitted to Raman spectroscopy. Principal components analysis scores were used to develop a quantitative model (regression) to correlate the amount of drug in the mixture. Results showed that, for binary mixtures, the PCA scores could detect the amount of crack with low error.
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Code:
ThP21
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Time Slot/Poster Number:
029
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Session:
Forensics/Geoscience/Environmental Applications
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Differential Raman Cross-Section of Dimethyl Sulfide
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| Robert Barletta; Christopher Roe
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Department of Chemistry, Univ. of South Alabama, Mobile, AL
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| View Abstract PDF |
| Summary |
Biogenic sulfur compounds such as dimethyl sulfide (DMS) are important contributors to the global carbon cycle. The relative differential Raman cross-section of gas-phase DMS, σDMS, has been measured with visible (Ar-ion laser) and ultraviolet (KrF–laser) excitation in order to assess the applicability of Raman for the direct, quantitative measurement of this compound.
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Code:
ThP21
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Time Slot/Poster Number:
031
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Session:
Forensics/Geoscience/Environmental Applications
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Comparison of Absolute Raman Cross Sections of Explosives in the Solid State and in Solution
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| Erik Emmons; Augustus Fountain; Steven Christesen; Jason Guicheteau
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U.S. Army Edgewood Chemical Biological Center, Apg, MD
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| View Abstract PDF |
| Summary |
Due to the increased threat of attack by improvised explisve device, the U.S. Army is interested in developing standoff techniques for detecting traces of explosives on surfaces. Raman spectroscopy is a potentially valuable technique in this regard, but suffers from signal levels that are generally quite low. In order to better quantify these levels, absolute Raman cross sections of explosives in the solid state and in solution have been measured. Variations in the spectra and cross sections in the different phases are discussed.
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Code:
ThP21
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Time Slot/Poster Number:
032
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Session:
Forensics/Geoscience/Environmental Applications
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Analysis of air pollution aerosols by Raman Spectroscopy and spectral resolution methods
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| Yasmina Dellaa1; Rahmoune Chaabane2; Jacky Kister1; Nathalie Dupuy1
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1laboratoire systèmes chimiques complexes, Marseille, France; 2Ecotoxicology and Abiotic stress laboratory, Constantine, Algeria
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| View Abstract PDF |
| Summary |
By their physical and chemical properties, carbonates and sulfates, produced by the cement industry, are one of the most important classes of atmospheric aerosols. They can have an impact on ecosystems, health and process of atmospheric chemistry and an important role in global climate change.
In the study of this pollution, the confocal Raman microscopy use has a great interest for the characterization of cement dusts collected on aerial parts of plants. Coupled with chemometric data processing, it allows determining particulate heterogeneous components in dust. The study of their effects on metabolic changes was also investigated in this work.
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Code:
ThP21
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Time Slot/Poster Number:
033
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Session:
Forensics/Geoscience/Environmental Applications
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Micro Raman spectroscopy investigation of patinas formed by exposure of copper to vapor of several aqueous electrolyte solutions.
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| Lucia Noda; Carolina Vautier-Giongo; Caue Moreira; Norberto Gonçalves; Daniel Rettori
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Universidade Federal de São Paulo, Diadema, Brazil
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| View Abstract PDF |
| Summary |
Patina is a thin layer of corrosion, naturally formed when copper or alloys of copper are exposed to the environment over time. Artificial patinas obtained by the exposition of copper sheets to the vapor from electrolytic aqueous solutions of NaCl, acetic acid, hydrogen chloride and acetic acid plus NaCl, were characterized by micro Raman spectroscopy. The compound formed in patinas obtained from vapor of acetic acid or acetic acid plus NaCl solutions was copper acetate. Patinas obtained from HCl solution are made of atacamite and cuprite and the ones obtained from NaCl solution are made of cuprite.
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Code:
ThP21
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Time Slot/Poster Number:
034
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Session:
Forensics/Geoscience/Environmental Applications
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Composition Of aerosols From The Shelter Of The Chernobyl Power Plant
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| Larysa Darchuk1; Anna Worobiec1; Victor Krasov2; Valeryi Khan2; Rene Van Grieken1
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1University of Antwerp, Antwerp, Belgium; 2Institute for Problems of SNPP, Chornobyl, Ukraine
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| View Abstract PDF |
| Summary |
The goal of the investigation was to study the indoor aerosol composition from a room with the nuclear fuel lava. Single particles were collected by Berner cascade impactor. Molecular analysis of the samples was provided by a micro-Raman spectrometer (Renishaw in via, GB) with laser excitation at 785 nm. Raman spectra of more than half of the analyzed particles consist of bands assigned to organic substances. Raman bands typical for uranium oxide, haematite, chalcocite were detected as a composition of the collected single particles.
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