[SMP38-P10] Laser Induced Breakdown Spectroscopy (LIBS) Analysis of H, O, N, C, Li, Ca and S in coal, organic-rich marine sediments and shale.
Keywords:LIBS, Sediments, Shale
We present H, O, N, C, Li, Ca, and S spectra, qualitative and quantitative data obtained by Laser Induced Breakdown Spectroscopy (LIBS) on coal, organic-rich marine sediments and shale reference materials. The reference material analyzed includes the USGS Cody Shale SCo-1 standard, the NIST 1632d, 1635a, 2692c, and 2693 coal standards, and the USGS Mag-1 and Environment Canada PACS-2 marine sediment standards. The instrument used for these analyses was the Applied Spectra J200 LIBS Instrument with dual detector configuration that features a broadband 6 channel CCD detector for simultaneous measurement of major and minor elements and a specialized ICCD detector to measure organic elements such as O, N, and H with highest possible sensitivity. Univariate calibration curves were built for C and H, a multivariate curve was developed for S, and a single standard calibration was performed for N. Reasonable precision and accuracy was achieved for all elements despite non-matrix matched standards, limited sampling area, and potential sample heterogeneities. Improvements can be made with better sample preparation techniques (i.e. pressing pellets), wider sampling area, and fine-tuning laser ablation parameters These results demonstrate the great potential of LIBS in the analysis of those elements that are difficult, if not impossible, to analyze by LA-ICP-MS in organic-rich geological samples.