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

By J. C. Van Loon

ISBN-10: 0127141707

ISBN-13: 9780127141701

Written for the working towards analyst, Analytical tools for Geochemical Exploration deals completely established chemical research tools for selecting what base or important metals are in geochemical exploration samples, reminiscent of rocks, soil, or sediment. thought is saved 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

Sample text

A s u m m a r y of the extensive literature on interferences in electrothermal atomization has been prepared by Slavin and Manning (11). Matrix matching and modification d o not o v e r c o m e all chemical interferences. Separation of the elements of interest from the bulk of the sample may be the only practical way to deal with severe p r o b l e m s . Ionization Interferences A t o m s of some elements can b e c o m e ionized in flames or electrothermal a t o m i z e r s . A s a result, the a t o m population diminishes and sensitivity declines.

T h e x-rays emitted by the elements c o m p o s i n g the sample h a v e intensities and wavelengths which are characteristic of the a t o m s of the various e l e m e n t s . T h u s , x-ray emission s p e c t r o m e t r y is a technique that provides both qualitative and quantitative analytical data. The s p e c t r o m e t e r s are capable of measuring both wavelengths and intensities of xrays emitted by the sample. T h e identity of an element emitting a particular line is established by measuring the wavelength of that line and comparing the wavelength with those in tables of standards.

N o n a b s o r b i n g - L i n e M e t h o d In this m e t h o d , the background signal is measured at a wavelength not m o r e than 20 nm from the r e s o n a n c e line. T h e background 30 2. Principles of Determinative Methods a b s o r b a n c e is then subtracted from the a b s o r b a n c e of the sample. T h u s , each sample must be analyzed at the t w o c h o s e n wavelengths unless a dual-channel instrument is being used. T h e line c h o s e n must be a nonabsorbing line of the element being m e a s u r e d .

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


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