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

By J. C. Van Loon

Written for the practising analyst, Analytical equipment for Geochemical Exploration bargains completely proven chemical research tools for picking out what base or useful metals are in geochemical exploration samples, similar to rocks, soil, or sediment. conception is stored to a minimal and entire strategies are supplied in order that no extra resources are had to behavior analyses

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In electrothermal analyzers, adjustments of drying and charring times and t e m p e r a t u r e s to volatilize as much as possible of the interfering matrix is a good p r o c e d u r e . A n o t h e r method is matrix matching. T h e compositions of standard solutions are altered to c o r r e s p o n d as closely as possible to those of the samples. Matrix matching may not be possible if the overall composition of the samples is not known. If the composition is complex, matching is not practical.

2. Internal Reference Element T h e performance of the nebulizer is d e p e n d e n t o n t h e physical properties of the solution. S t a n d a r d s and samples should b e m a t c h e d as closely as possible in their c o n c e n t r a t i o n s of acids a n d dissolved salts. If matching is not feasible, an alternative p r o c e d u r e is t o u s e an internal reference element in s t a n d a r d s and samples. T h e reference element should b e o n e that is not e x p e c t e d to be present in the samples.

In the early w o r k on x-ray a n a l y s e s , primary x-rays w e r e used to excite the characteristic secondary x-rays from the sample. H e n c e , the technique is described as x-ray fluorescence s p e c t r o m e t r y . In analyses of geological s a m p l e s , x-ray fluorescence ( X R F ) is used for meas u r e m e n t s of major e l e m e n t s , as well as m a n y minor and trace e l e m e n t s . M o d e r n instruments are capable of high-speed analyses with good sensitivity to the low parts per million range.

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