Analysis of Trace Siderophile Elements at High Spatial Resolution Using Laser Ablation ICP-MS

Details Analysis of Trace Siderophile Elements at High Spatial Resolution Using Laser Ablation ICP-MS Analysis of Trace Siderophile Elements at High Spatial Resolution Using Laser Ablation ICP-MS

May 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006agusm.u41b..02c&link_type=abstract

American Geophysical Union, Fall Meeting 2007, abstract #U41B-02

Statistics

3662 Meteorite Mineralogy And Petrology (1028, 6240), 1028 Composition Of Meteorites (3662, 6240), 1094 Instruments And Techniques

Scientific paper

Laser ablation inductively coupled plasma mass spectometry is an increasingly important method of performing spatially resolved trace element analyses. Over the last several years we have applied this technique to measure siderophile element distributions at the ppm level in a variety of natural and synthetic samples, especially metallic phases in meteorites and experimental run products intended for trace element partitioning studies. These samples frequently require trace element analyses to be made at a finer spatial resolution (25 microns or better) than is frequently attained using LA-ICP-MS. In this presentation we review analytical protocols that were developed to optimize the LA-ICP-MS measurements for high spatial resolution. Particular attention is paid to the trade-offs involving sensitivity, ablation pit depth and diameter, background levels, and number of elements measured. To maximize signal/background ratios and avoid difficulties associated with ablating to depths greater than the ablation pit diameter, measurement involved integration of rapidly varying, transient but well-behaved signals. The abundances of platinum group elements and other siderophile elements in ferrous metals were calibrated against well-characterized standards, including iron meteorites and NIST certified steels. The calibrations can be set against the known abundance of an independently determined element, but normalization to 100 percent can also be employed, and was more useful in many circumstances. Evaluation of uncertainties incorporated counting statistics as well as a measure of instrumental uncertainty, determined by replicate analyses of the standards. These methods have led to a number of insights into the formation and chemical processing of metal in the early solar system.

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