Laser Ablation-Inductively Coupled Plasma-Mass Spectrometer (LA-ICP-MS) in Geosciences: Further Improvement for Elemental Analysis.
Degree: PhD, Geowissenschaften und Geographie, 2017, Georg-August-Universität Göttingen
A quantitative reduction strategy consisting of Ratioing, Standardization, and Normalization (RSN) was proposed to process the LA-ICP-MS transient signal of NIST, MPI-DING, USGS and CGSG glass reference materials. The RSN strategy allows the quantitative reduction without knowing the concentration of internal standard prior to LA-ICP-MS analysis. The down-hole fractionations of the investigated glasses in initial 5-35s ablation period were insignificant and independent of the chosen internal standards under the given laser conditions. The analytical accuracy obtained from internal standardization was affected by the given value of the internal standard. Contrarily, accuracy obtained from RSN strategy was independent of the chosen internal standard. Matrix effects between NIST610 and geological glasses were negligible. Imprecise certified values of several elements were identified. The prefer values reported in this study are the better-estimated values for these elements. Laser spot size could be down to 15 um where the applicability of RSN strategy was still acceptable. The short- and long-term precision (359 repetition analysis over three years) illustrated that either instrument conditions or the capability of RSN strategy were approvingly acceptable. The simplicity and applicability of RNS strategy in comparison with internal standardization strategy make it suitable for quantitative reduction for silicate glasses.
Quantification strategy as an essential issue for laser ablation ICP-MS plays an important role in the guarantee of analytical accuracy. In this study, the reference value uncertainties of current available glass reference materials (including NIST, MPI-DING and USGS) as well as the matrix effects were systematically evaluated. The results illustrated that NIST610 was better than other glass reference materials from aspect of reference value uncertainty. The matrix effects among NIST, MPI-DING and USGS glasses were insignificant under the experimental conditions. The quantification strategy based on two reference materials (NIST610 and StHs6/80-G) and bulk normalization as 100 % (wt) was proposed to reduce the LA-ICP-MS generated transient signals, which eliminates the deficiencies encountered with the quantification strategy using single reference material, such as the extreme low content or large uncertainty of some elements. The comparison of ML3B-G results obtained from three quantification strategies (single reference material NIST610, single reference material StHs6/80-G and two reference materials) illustrated that the proposed strategy improved the analytical accuracy. Three reference materials including BCR-2G, CGSG-2 and KL-2G were quantified using the proposed strategy, and almost all data matched well with reference values. The data reported in this study could supplement the reference value database for BCR-2G, CGSG-2 and KL2-G.
A comparison of sample preparation methods including ultrafine powder pellet and flux-free fusion glass for LA-ICP-MS analysis of granitic rock samples was…
Advisors/Committee Members: Wörner, Gerhard (advisor), Wörner, Gerhard (referee), Simon, Klaus (referee).
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APA (6th Edition):
Wu, S. (2017). Laser Ablation-Inductively Coupled Plasma-Mass Spectrometer (LA-ICP-MS) in Geosciences: Further Improvement for Elemental Analysis. (Doctoral Dissertation). Georg-August-Universität Göttingen. Retrieved from http://hdl.handle.net/11858/00-1735-0000-0023-3EF8-1
Chicago Manual of Style (16th Edition):
Wu, Shitou. “Laser Ablation-Inductively Coupled Plasma-Mass Spectrometer (LA-ICP-MS) in Geosciences: Further Improvement for Elemental Analysis.” 2017. Doctoral Dissertation, Georg-August-Universität Göttingen. Accessed May 23, 2018.
MLA Handbook (7th Edition):
Wu, Shitou. “Laser Ablation-Inductively Coupled Plasma-Mass Spectrometer (LA-ICP-MS) in Geosciences: Further Improvement for Elemental Analysis.” 2017. Web. 23 May 2018.
Wu S. Laser Ablation-Inductively Coupled Plasma-Mass Spectrometer (LA-ICP-MS) in Geosciences: Further Improvement for Elemental Analysis. [Internet] [Doctoral dissertation]. Georg-August-Universität Göttingen; 2017. [cited 2018 May 23].
Available from: http://hdl.handle.net/11858/00-1735-0000-0023-3EF8-1.
Council of Science Editors:
Wu S. Laser Ablation-Inductively Coupled Plasma-Mass Spectrometer (LA-ICP-MS) in Geosciences: Further Improvement for Elemental Analysis. [Doctoral Dissertation]. Georg-August-Universität Göttingen; 2017. Available from: http://hdl.handle.net/11858/00-1735-0000-0023-3EF8-1