Abstract
The potential of laser-induced breakdown spectroscopy (LIBS) for the rapid determination of platinum in liquid silicone oils has been evaluated in the framework of on-line process control. A comparison of LIBS sensitivity between three setups designed for liquid analysis (static, liquid jet and flowing liquid) was performed using a 266 nm Nd/YAG laser irradiation. Best results were obtained using the flowing liquid setup and a similar limit of detection was obtained using the liquid jet. The effect of different buffer gases (Ar, He, N2, etc.) on the signal sensitivity was studied in liquid jet analysis and best values were obtained with a nitrogen sheath gas. Detection limits were in the 100 mg/kg range for both setups. Quantitative determination of platinum in real liquid samples was also investigated using both liquid jet and flowing liquid setups. Calibration curves were plotted for Pt with the liquid jet and the flowing liquid setups under optimised temporal acquisition parameters (delay time and gate width). A normalisation using a silicon line was applied and recovery ranged from 3 to 15 % for Pt in catalyst samples with both setups showing that LIBS is a sensitive and accurate method for on-line applications.
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Acknowledgements
This work was performed in the frame of the global project INnovAL. Labelled by the cluster Axelera, INnovAL gathers 13 partners and was selected in the 9th call for projects from the Unique Interministerial Fund. It is supported up to 4.2M€ by the French state, the urban communities of Lyon (Grand-Lyon) and Grenoble (Grenoble-Alpes métropole) and the European Regional Development Fund (ERDF) of the European Union. We would like to thank M. Laurent Saint-Jalmes from Bluestar Silicones for the loan of platinum samples and Sébastien Perrier for his corrections on the manuscript.
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Part of this work was presented at the 2012 Winter Conference on Plasma Spectrochemistry in Tucson, Arizona.
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Barreda, FA., Trichard, F., Barbier, S. et al. Fast quantitative determination of platinum in liquid samples by laser-induced breakdown spectroscopy. Anal Bioanal Chem 403, 2601–2610 (2012). https://doi.org/10.1007/s00216-012-6019-2
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DOI: https://doi.org/10.1007/s00216-012-6019-2