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

By J. C. Van Loon

Written for the training analyst, Analytical equipment for Geochemical Exploration deals completely demonstrated chemical research tools for selecting what base or priceless metals are in geochemical exploration samples, akin to rocks, soil, or sediment. conception is saved to a minimal and entire techniques are supplied in order that no extra resources are had to behavior analyses

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Echelle spect r o m e t e r s give especially good resolution. Line coincidence will result in positive errors unless the o p e r a t o r recognizes the problem. Reference b o o k s which list many spectral interferences are available (23,24). A n u m b e r of m e t h o d s of o v e r c o m i n g interferences c a u s e d by line coincidence are available. T h e first is the use of reference data in the selection of an analyte line free of interference from lines of o t h e r elements in the sample (25).

T h e value of the intercept is the concentration of the a n a l y t e . F o r the m e t h o d to be successful, the F i g u r e 2 . 6 . C a l i b r a t i o n g r a p h for m e t h o d of s t a n d a r d additions. STANDARD ADDITIONS 2. 32 Principles of Determinative Methods calibration graph must be linear within the range of concentrations as in Fig. 6. Care must be taken in work with electrothermal analyzers as the linear range is often very short. Background correction and additions to suppress interferences should also be used.

Signals can be e n h a n c e d or d e p r e s s e d . Although solutions containing elements such as calcium and p h o s p h a t e , calcium and aluminum, and combinations of alkali metals have been studied by a n u m b e r of r e s e a r c h e r s , conflicting results have been r e p o r t e d . T h e s e interferences are complex in nature and involve volatilization of analyte, temperature changes in the plasma, and ionization suppression (26). , changing rf power, argon flow rate in the sample line, and observation height in the plasma.

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