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|Title: ||Water analysis by laser induced breakdown spectroscopy (LIBS)|
|Authors: ||Alsulmi, Abdullah Sulaiman|
|Keywords: ||Laser induced breakdown spectroscopy|
|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
|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|
|Appears in Collections:||College of Science|
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