Sampling considerations when analyzing micrometric-sized particles in a liquid jet using laser induced breakdown spectroscopy

Abstract : Pollution of air and water are major concerns both at domestic and European Union level. With the aim in view to preserve and improve water quality, the European Community has adopted a water framework directive (WFD). Its objective is to achieve a good ecological and chemical status of waters by 2015. In this context, research in metrology has been engaged at INERIS in order to detect pollutants in liquids in ionic or particulate form, though the latter form is not directly targeted by the WFD. Still, particulates are known to play an important role in pollutant transportation such as heavy metals. In addition, NOAA (Nano Objects, their Agglomerates and their Aggregates) considered as an emerging pollutant are an object of concern whose detection should be made possible as well. All this emphasize the need to develop an instrument allowing insitu and real-time elemental identification and mass concentration determination of particles suspended in water. Environmental monitoring and surveillance of pollutants in particulate form possibly released in waste waters by industries involved in nanoparticle manufacturing and processing are two telling examples of applications of such instrumental development. The LIBS (Laser-Induced Breakdown Spectroscopy) technique was retained to tackle such issue. In this work, the coupling of the LIBS technique with the liquid jet is examined when tackling the issue of micrometric-sized particle detection in suspensions. Monodispersed micrometric-sized particles of borosilicate glass were used to simulate nanoparticle aggregates in suspensions. Using the recorded LIBS spectra, the evolution of the sampled volume within the liquid as a function of laser energy has been estimated along with the variations of the signal to noise ratio (SNR) corresponding to particle detection. Both the sampling volume and the SNR were found to saturate beyond a certain value of laser fluence. In addition, the sampled volume was found much smaller than the jet thickness times the estimated laser jet interaction surface. Last but not least, particles were found not to entirely vaporize. All these results point out the limitations of the coupling of the liquid jet with LIBS for particle detection in liquids.
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https://hal-ineris.archives-ouvertes.fr/ineris-00971200
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Submitted on : Wednesday, April 2, 2014 - 3:59:13 PM
Last modification on : Monday, September 2, 2019 - 1:06:01 PM

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  • HAL Id : ineris-00971200, version 1
  • INERIS : EN-2013-287

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Cheikh-Benoît Faye, Tanguy Amodeo, Emeric Frejafon, Nicole Delépine-Gilon, Christophe Dutouquet. Sampling considerations when analyzing micrometric-sized particles in a liquid jet using laser induced breakdown spectroscopy. 7. Euro-Mediterranean Symposium on Laser Induced Breakdown Spectroscopy (EMSLIBS 2013), Sep 2013, Bari, Italy. ⟨ineris-00971200⟩

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