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By Howard E. Taylor

Inductively coupled plasma-mass spectrometry presents chemists with a number of possible choices for fixing analytical difficulties. Taylor, a learn chemist with the U.S. Geological Survey in Boulder, CO, summarizes the operational features of the expertise, the categories of instrumentation presently on hand, the relative benefits of other forms of pattern advent, thoughts for reaching and studying effects, and power issues of info acquisition and interpretation for particular functions. applicable as a supplementary textual content for graduate classes concerning analytical chemistry or hint aspect research, relatively in chemistry, environmental technological know-how, geology, engineering, oceanography, archaeology, physics, and biology.

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Different integration times for each isotope m/z can be used to accommodate differences in isotopic abundances (see Appendix 2) of the analyte elements, permitting similar sensitivity and precision to be achieved for all analyte elements being measured. , minimizing the effects of fluctuations in the ICP). The peak hopping approach is generally considered the most desirable for quantitative analysis. It also provides the most time-efficient approach, because time is not w^asted making quantitative measurements in regions of the mass spectrum that are not of interest.

After separation, the individual ion beams, which are characteristic of specific charged isotopic or molecular species, are sequentially or simultaneously (multicollector spectrometer) directed to a detector devised to measure their individual ion currents. The magnitude of these ion currents is proportional to the population of the analyte ion species in the multicomponent ion beam sampled from the ICP. Therefore, the measurement of the m/z of the ion allows qualitative identification of the isotope or molecule being measured, and the magnitude of the ion current is used to provide quantitation of the amount of the analyte in the original sample.

Usually the latter geometry is used in ICP-MS applications because of the better abundance sensitivity that can be achieved in this configuration. 10 compares the single-focusing and double-focusing spectrometers (electrostatic analyzer between the magnetic sector and the detector) with an illustration of the comparative resolution of the mass spectra obtained from each. 11. 9 Nier-Johnson geometry double-focusing magnetic-sector instrument. 10 Comparison of single-focusing and double-focusing magnetic-sector mass spectrometers with an illustration of comparative resolutions.

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