By J. C. Van Loon
Written for the training analyst, Analytical tools for Geochemical Exploration bargains completely verified chemical research equipment for deciding on what base or worthwhile metals are in geochemical exploration samples, comparable to rocks, soil, or sediment. concept is stored to a minimal and whole techniques are supplied in order that no extra assets are had to behavior analyses
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Additional resources for Analytical Methods for Geochemical Exploration
A multichannel instrument is designed so that a n u m b e r of single-channel s p e c t r o m e t e r s can be arranged radially about an x-ray tube and sample. E a c h of the subassemblies has its o w n collimator, analyzing crystal, and d e t e c t o r . In this m a n n e r , up to 28 elements in the sample can be measured simultaneously. Most of the channels can be preset for specific analyte lines. In addition, o n e or more channels can be equipped as for scanning and thus are suitable for qualitative w o r k .
T h e flexibility of the scanning m o n o c h r o m a t o r design is an advantage when samples of different elemental compositions must be analyzed. The o p e r a t o r is not limited by a prior selection of emission lines. C . INTERFERENCES S o m e of the interelement effects e n c o u n t e r e d in atomic absorption work are either absent or greatly reduced in an ICP source. The reason is that the high atomization t e m p e r a t u r e s in a chemically inert a t m o s p h e r e and the relatively long residence time of the analyte in the plasma result in almost complete dissociation and atomization of the analyte.
T h e preparation of calibration c u r v e s will involve background corrections and corrections for line overlaps as explained earlier. Most I C P calibration c u r v e s are linear. S o m e w o r k e r s h a v e reported nonlinearities in c u r v e s covering extended concentration ranges. T h e data systems of most modern instruments include curvefitting capabilities, and slight deviations from linearity c a n be a c c o m m o d a t e d . At least five s t a n d a r d s should be u s e d , and m o r e are desirable.