Journal ArticleDOI
Chemical and phase composition of particles produced by laser ablation of silicate glass and zircon—implications for elemental fractionation during ICP-MS analysis
TLDR
In this paper, the chemical and phase compositions of particles produced by laser ablation (266 nm Nd:YAG) of silicate NIST glasses and zircon were studied by SIMS and HR-TEM techniques.Abstract:
The chemical and phase compositions of particles produced by laser ablation (266 nm Nd:YAG) of silicate NIST glasses and zircon were studied by SIMS and HR-TEM techniques. The data suggest that the formation of phases of different mineralogy and/or chemical composition from the original sample at the ablation site can result in elemental fractionation (non-stoichiometric sampling) in material delivered to the ICP-MS for quantitative analysis. Evidence of the element fractionation is preserved in chemically zoned ejecta deposited around the ablation pit. The chemical composition and mineralogy of particles varies with particle size so that the efficiency of transport of particles also plays a role in elemental fractionation. During the first 250 pulses in a typical ablation experiment using a 266 nm laser, particle sizes are mainly <2.5 μm; thereafter they decrease to <0.3 μm. Pb and U are fractionated significantly during the ablation of both silicate glass and zircon. During the ablation of glass, both micron-sized, melt-derived, spherical particles, and nm-sized, condensate-derived particle clusters, are produced; the very smallest particles (<0.04 μm) have anomalously high Pb/U ratios. For zircon, both larger (0.2–0.5 μm) spherical particles and agglomerates of smaller (∼0.005 μm) particles produced by ablation are mixtures of amorphous and crystalline materials, probably zircon, baddeleyite (ZrO2) and SiO2. Evidence for thermal decomposition of zircon to baddeleyite and SiO2 is preserved in the wall of the ablation pit, and may lead to the commonly observed increase in Pb/U recorded during laser ablation ICP-MS analysis. It follows that a matrix-matched external calibration is essential for achieving highly precise and accurate laser (266 nm wavelength) ablation ICP-MS analysis of Pb and U in silicate samples.read more
Citations
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Journal ArticleDOI
Reappraisement and refinement of zircon U-Pb isotope and trace element analyses by LA-ICP-MS
TL;DR: In this paper, a protocol was established for simultaneous measurements of zircon U-Pb ages and trace elements by LA-ICP-MS at spot sizes of 16-32?m.
Journal ArticleDOI
Improved laser ablation U‐Pb zircon geochronology through robust downhole fractionation correction
TL;DR: In this paper, the authors proposed a data reduction approach to correct the effects of downhole elemental fractionation by first observing the elemental response and then applying an appropriate (and often unique) model to the data.
Journal ArticleDOI
Electrospray-assisted laser desorption/ionization mass spectrometry for direct ambient analysis of solids
Jentaie Shiea,Min-Zon Huang,Hsiu-Jung Hsu,Chi-Yang Lee,Cheng-Hui Yuan,Iwona B. Beech,Jan Sunner +6 more
TL;DR: For the first time, mass spectra of intact proteins were obtained using laser desorption without adding a matrix in this study, demonstrating the applicability of ELDI to the analysis of proteins and synthetic organic compounds.
Journal ArticleDOI
Laser ablation in analytical chemistry.
TL;DR: Current issues in fundamental research, applications based on detecting photons at the ablation site and by collecting particles for excitation in a secondary source (ICP), and directions for the technology are discussed.
Journal ArticleDOI
Elemental fractionation in laser ablation-inductively coupled plasma-mass spectrometry: evidence for mass load induced matrix effects in the ICP during ablation of a silicate glass
Ivana Kroslakova,Detlef Günther +1 more
TL;DR: In this article, the mass load dependent matrix effects in LA-ICP-MS were studied and it was shown that an increase of the mass loads of the ICP by a factor of 16 (crater diameter from 30 to 120 μm) leads to a decrease in certain intensity ratios (e.g. As/Ca, Sn/Ca and the constant Be/Ca ratios).
References
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Journal ArticleDOI
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Journal ArticleDOI
Deposition and element fractionation processes during atmospheric pressure laser sampling for analysis by ICP-MS
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Journal ArticleDOI
Paragenesis and U-Pb systematics of baddeleyite (ZrO2)
Larry M. Heaman,A N LeCheminant +1 more
TL;DR: Baddeleyite is an ideal mineral for U-Pb dating because it has abundant U (up to 3000 ppm), negligible initial common Pb, rarely occurs as xenocrysts, and, in unmetamorphosed samples, experiences negligible Pb loss as discussed by the authors.
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