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Please use this identifier to cite or link to this item: http://hdl.handle.net/123456789/8713

Title: Water analysis by laser induced breakdown spectroscopy (LIBS)
Authors: Alsulmi, Abdullah Sulaiman
Keywords: Laser induced breakdown spectroscopy
LIBS
Issue Date: 2008
Abstract: Laser induced breakdown spectroscopy (LIBS) has evolved over the past 40 years into a useful tool for elemental analysis applicable to solid, liquid, and gas phase samples. LIBS analysis is often performed by focusing pulsed laser radiation onto a sample to ablate material that is atomized and thermally excited in the resulting plasma to emit characteristic radiation. Each element can be uniquely identified by the frequency of the emitted light for qualitative applications or the relative intensity of the light for quantitative analysis. LIBS has been extensively used for elemental determinations in solids due to the convenience of combined sampling and excitation compared to more common atomic spectroscopy techniques that require lengthy preparation procedures prior to analysis. In contrast, applications of LIBS to liquids have been less common, primarily due to inferior analytical performance compared to traditional laboratory methods. Since these methods are confined to the laboratory, a strong motivation for developing LIBS methods for liquids is remote, on-site, and in situ applications where the ability to perform the measurement outweighs the compromise in performance. As developments in LIBS continue to grow and applications for liquids become more widespread, improving limit of detection becomes more important. This dissertation addresses water analysis by laser induced breakdown spectroscopy (LIBS). This thesis was divided into five chapters, as follows: The first chapter This chapter includes general introduction about Laser-Induced Breakdown Spectroscopy and general theoretical background for LIBS including LIBS plasma fundamentals (spectral line profiles, plasma opacity, thermodynamic equilibrium, plasma temperature and electron density). This chapter also describes the advantages and disadvantages of LIBS. The second chapter This chapter provides a brief review of the recent literature concerning the applications of LIBS in liquids involveing 5 main sampling configurations; bulk, droplets, wet aerosols, surface, and jets. The third chapter this chapter describes the experimental setup, which includes laser system, optical parts, pumpbacked stream, monochromator and samples and explains the procedure of the experiment. The fourth chapter This chapter studies the experimental parameters for developing the detection of elemental species in water and it also describes the construction calibration curves using standard solutions for three elements (Na, Ca and Mg). It also presents the results of the experiments for water samples that were collected from various locations and a discussion of those results obtained in this study. The fifth chapter This chapter makes the final conclusion of this project and provides a summary for future research.
Description: This study is conducted & thesis submitted to the Faculty of the Graduate Studies of the King Saud University in partial fulfillment of the requirements for the degree of Master of Science, Department of Physics & Astronomy, Riyadh, Kingdom Saudi Arabia, 2008G
URI: http://hdl.handle.net/123456789/8713
Appears in Collections:College of Science

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