Analysis of alluvial soils for environment survey by micro LIBS (µLIBS)

Abstract

The chemical composition of a material gets fundamental importance for numerous tasks of process control and quality assurance in industrial production and environmental technology [1, 2]. The Laser Analysis and Surface Study Laboratory of the CEA Saclay in collaboration with the Department of Applied Geoscience from Bordeaux I University tried to evaluate the capability of the micro Laser Induced Breakdown Spectroscopy (µLIBS) for application in environmental field. First samples provided come from alluvial sediments catched at different locations along Garonne bed river (south east of France). These researches aim at controlling the heavy metal transport and understanding processes involved into the Garonne river mud. The same samples were analysed at Bordeaux I University by SEM/X-EDS and ICP/AES after dilution. Qualitative surface mapping analysis by µLIBS have been performed with the use of Fe and Mn lines in an Al, Si and Ca matrix. Those elements of interest (Fe & Mn) are considered to be the vehicule of the pollutant (Ni, Zn, Cd, Pb, etc) transport mechanism. Multi elemental surface mapping reconstruction has allowed to obtain a composition approach of the different micro texture observed on the sample surface.

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