By J. C. Van Loon
Written for the practising analyst, Analytical tools for Geochemical Exploration deals completely verified chemical research equipment for deciding on what base or invaluable metals are in geochemical exploration samples, equivalent to rocks, soil, or sediment. thought is stored to a minimal and whole systems are supplied in order that no extra resources are had to behavior analyses
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Extra info for Analytical Methods for Geochemical Exploration
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.
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). H o w e v e r , the sensitivity of such lines may not be sufficient for trace element determinations.
This m e t h o d is time-consuming. It is used w h e n interference p r o b l e m s o c c u r (except for nonspecific interferences). T h e a p p r o a c h is particularly valuable in electrothermal work. T h e usual p r o c e d u r e is to p r e p a r e t h r e e aliquot s. O n e of the aliquots is spiked with a quantity of standard so that the resulting analyte concentration is approximately twice that of the original sample. A second aliquot is spiked with sufficient standard to yield three times the initial analyte concentration.
Analytical Methods for Geochemical Exploration by J. C. Van Loon