Publication details
Feasibility of iodine determination in pellets with Laser-Induced Breakdown Spectroscopy
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| Year of publication | 2015 |
| Type | Conference abstract |
| MU Faculty or unit | |
| Citation | |
| Description | The work is based on iodine detection in pressed pellets using LIBS. Generally, detection of halogens using such method has been regarded challenging1. For this study a double pulse (DP)-LIBS system was employed. It consists of a Nd: YAG 266 nm ablation laser and a Nd: YAG 1064 nm re-excitation laser, both arranged in orthogonal configuration. The mail goal was to compare different types of binders, non-conductive and conductive ones. From the first category, frequently used microcellulose and from the second one silver powder was used. We focused on the influence of the binder on sensitivity and changes in set of accessible lines of iodine. The observed iodine atomic and ionic lines fall to interval of 500-600 nm. Iodine emission was measured at LIBS of potassium iodide and potassium iodite salts mixed and pressed with a binder. The iodine content was in the range of several percents. Secondly we studied effect of nanoparticles on emission intensity enhancement. As previous studies proved2 Nanoparticle Enhanced Laser Induced Breakdown Spectroscopy (NELIBS) can increase the emission of some lines. Based on theoretical knowledge we assumed effect of a conductive binder on intensification of analytical signal at least in the presence of nanoparticles. The yielded results indicate that the intensification of the iodine signal depends not only on the nanoparticle presence but also on selected line, iodine matrix and the used binder. High excitation energies of iodine ionic lines, easy excitation of silver and different ablation rates of cellulose and silver play an important role. Careful selection of the above mentioned parameters can lead to sensitivity increase but also signal depression can occur when inappropriate conditions are applied. |
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