Download e-book for kindle: Analytical Methods for Geochemical Exploration by J. C. Van Loon

By J. C. Van Loon

ISBN-10: 0127141707

ISBN-13: 9780127141701

Written for the practising analyst, Analytical equipment for Geochemical Exploration bargains completely proven chemical research tools for picking what base or worthy metals are in geochemical exploration samples, reminiscent of rocks, soil, or sediment. thought is saved to a minimal and entire approaches are supplied in order that no extra assets are had to behavior analyses

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T h e coefficient is calculated by using a pure solution of Β and measuring the line intensity in the a b s e n c e of A. T h u s C A (corrected) = C A (total) - A : A BC B (actual) w h e r e C stands for c o n c e n t r a t i o n . T h e c o n c e n t r a t i o n s of Β must be k n o w n in the samples being analyzed. If m o r e than one element interferes, then appropriate corrections must be applied for each element. A third m e t h o d is the use of multielement s t a n d a r d s in the preparation of calibration c u r v e s .

T h e description which follows deals with practical a s p e c t s . F o r additional information, the reader should consult the t e x t b o o k s listed in Refs. 29 and 30. B. INSTRUMENTS X-ray fluorescence s p e c t r o m e t e r s are of t w o t y p e s . In the wavelength-dispersive design, a single crystal diffracts the x-rays emitted from the sample in o r d e r to isolate narrow wavelength b a n d s . In energy-dispersive s p e c t r o m e t e r s , the polychromatic b e a m of radiation from the sample falls on a d e t e c t o r , which isolates narrow energy b a n d s .

T h e scanning channels can also be used for measurements of lines of elements which are required less frequently than the elements with their o w n preset c h a n n e l s . During an analysis, each channel accumulates c o u n t s for a specific time or until a standard channel a c c u m u l a t e s a designated count (one of the channels is used as the standard channel). W h e n the counting period has been c o n c l u d e d , the count in each channel is either printed or used by a c o m p u t e r in a program which yields the quantitative results.

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Analytical Methods for Geochemical Exploration by J. C. Van Loon

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