Download PDF by L. Ebdon, E. H. Evans, Andy S. Fisher, S. J. Hill: An Introduction to Analytical Atomic Spectrometry

By L. Ebdon, E. H. Evans, Andy S. Fisher, S. J. Hill

ISBN-10: 047197417X

ISBN-13: 9780471974178

ISBN-10: 0471974188

ISBN-13: 9780471974185

An creation to Analytical Atomic Spectrometry is a completely revised and up to date model of the hugely winning booklet via Les Ebdon, An advent to Atomic Absorption Spectroscopy. The switch in name displays the variety of major advancements within the box of atomic spectrometry considering the fact that ebook of the sooner booklet. New subject matters contain plasma atomic emission spectrometry and inductively coupled plasma mass spectrometry. Key features:* Self evaluation questions all through booklet to check realizing* keyword phrases highlighted to facilitate revision* sensible workouts utilizing glossy ideas* complete bibliography for extra readingThe accessibility of An creation to Analytical Atomic Spectrometry, makes it an excellent revision textual content for postgraduates, or for these learning the topic by way of distance studying.

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Additional resources for An Introduction to Analytical Atomic Spectrometry

Sample text

Double-beam operation offers far fewer advantages in AAS than it does in molecular absorption spectrometry, mainly because the reference beam does not pass through the most noise-prone area of the instrument, the flame. Double-beam systems can compensate for source drift, warm-up and source noise. This should lead to improved precision and often does. However, as the major source of noise is likely to be the flame, this advantage is slight and may be more than offset by the significant loss of intensity in the light signal, and hence lower signal-to-noise ratio.

Page 36 beam strikes the solid part of the chopper, it is interrupted; the hole in the centre allows it to pass. The sector is placed between the source and the flame. The atomic absorption signal is now modulated, but the atomic emission signal is not. An AC amplifier tuned to the atomic absorption signal, via phasing coils on the rotating sector, gates the amplifier and selectively amplifies the atomic absorption signal as opposed to the DC atomic emission signal. It is therefore essential that the sector be placed between the source and the flame.

Controls for 'curve correction' may be supplied which enable the calibration to be linearized by extra expansion on standards of high concentration. Many modern instruments provide an autosampler, and if this is in use then, for samples whose concentration exceeds the linear part of the calibration curve, the analytical procedure may be programmed so that automatic dilution is performed. Page 43 The computer will then multiply the concentration obtained by the relevant dilution factor automatically, and the concentration in the undiluted sample will be read out.

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An Introduction to Analytical Atomic Spectrometry by L. Ebdon, E. H. Evans, Andy S. Fisher, S. J. Hill

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