By Howard E. Taylor
Inductively coupled plasma-mass spectrometry presents chemists with a number of possible choices for fixing analytical difficulties. Taylor, a study chemist with the U.S. Geological Survey in Boulder, CO, summarizes the operational features of the know-how, the kinds of instrumentation presently to be had, the relative merits of other sorts of pattern creation, innovations for achieving and analyzing effects, and strength issues of information acquisition and interpretation for particular functions. acceptable as a supplementary textual content for graduate classes regarding analytical chemistry or hint aspect research, quite in chemistry, environmental technological know-how, geology, engineering, oceanography, archaeology, physics, and biology.
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Additional info for Inductively Coupled Plasma-Mass Spectrometry
Sample text
Regions of the mass spectrum that did not include m/z values of elements of interest could be skipped over to save time. For instance, the rod voltages could be set, under computer control, to scan an m/z range of 6 to 11 to measure the major isotopes of Li, Be, and B; from 63 to 67 to measure the isotopes of Cu and Zn; and from 203 to 208 to measure the isotopes of Tl and Pb. Using this strategy, time would not be wasted measuring other mass ranges where no useful ion current information for the elements of interest would be found.
Samples can be reproducibly introduced with a minimum of sample handling. However, significant advantages, for example, enhancement of sensitivity by preconcentration, can be realized using the solvent evaporation approach for some types of samples, except for the analysis of volatile analytes.
This correction is particularly important when making isotope ratio measurements, especially when there is a significant difference in abundance between the two isotopes being ratioed. 15 shows the effect of overor undercorrecting for dead time. An alternate mode of operation of the electron multiplier is the analog mode. In this mode, a lower applied potential is applied to the detector, reducing the gain to 10"^ or less. 15 The effects of dead time corrections. the entrance of the detector. This current is amplified and digitized by an analog-to-digital (A-D) converter and is subsequently related to the analyte ion concentration.
