LIBS in Environmental Analysis
| Authors | |
|---|---|
| Year of publication | 2005 |
| Type | Article in Proceedings |
| Conference | International Conference on Inorganic Environmental Analysis - Proceedings of the 4th Conference |
| MU Faculty or unit | |
| Citation | |
| Field | Analytic chemistry |
| Keywords | Laser ablation; LIBS;Time resolved emission spectrometry; Soil |
| Description | Laser induced breakdown spectrometry (LIBS) plays nowadays important role in environmental chemistry. Recently, LIBS has been applied to many kinds of samples such as liquid samples, direct analysis of solid samples and depth profiling of layered materials. LIBS has various advantages over more conventional methods of atomic emission spectroscopy. The most relevant characteristics are direct analysis of solid samples, no sample preparation, a small sample requirement, the possibility of on-line analysis, localized microanalysis, a single step of vaporization and excitation and simultaneous multielement analysis. In the present work, LIBS has been applied to the determination of heavy metals in soil samples. Samples were presented for the analysis as pressed pellets prepared by mixing with powdered silver binder or poured pellets with epoxide resin binder. Q-switched Nd:YAG laser with the wavelength of 1064 nm and repetition rate of 10 Hz was used for ablation of prepared pellets. Sample was attached to a holder, which was a part of a laboratory-made ablation chamber. This holder was mounted on a computer controlled xy translation stages. Emission of breakdown plasma from chamber was collected by a fiber optic system and delivered onto an entrance slit of the TRIAX 320 monochromator. The monochromator was equipped with a photomultiplier Hamamatsu R928 gated by a laboratory-built control unit. Time resolved signal was recorded by the digital storage oscilloscope TDS1012. The time dependences of LIBS signals were obtained and the dependences of signal on element concentration were constructed. |
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