By J. C. Van Loon
ISBN-10: 0127141707
ISBN-13: 9780127141701
Written for the training analyst, Analytical equipment for Geochemical Exploration bargains completely proven chemical research equipment for picking what base or beneficial metals are in geochemical exploration samples, resembling rocks, soil, or sediment. idea is stored to a minimal and entire tactics are supplied in order that no extra assets are had to behavior analyses
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Sample text
Background correction is used to o v e r c o m e the interferences, as described later. Chemical Interferences T h e s e interferences o c c u r in both flame and electrothermal a n a l y z e r s . T h e y are c a u s e d by chemical interactions in the sample which alter the proportion of the analyte which is atomized or the rate at which analyte atomization t a k e s place. P u r e standard solutions may not be subject to the same chemical interactions, so e r r o n e o u s results are possible in direct c o m p a r i s o n s of 28 2.
Matrix matching is important in c o m p e n s a t i n g for interferences. 10. Selection of Instruments A list of commercial instruments together with brief descriptions is published in 4 ' A n n u a l R e p o r t s on Analytical Atomic S p e c t r o s c o p y " by the Royal Society of C h e m i s t r y , L o n d o n . T h e list c o v e r s single- and double-beam instruments of major manufacturers in North America, the Western European area, Australia, and Japan. A major factor in the choice of an instrument will be the type and volume of work being u n d e r t a k e n in a laboratory.
T h e best accuracy is I. Atomic Absorption Spectrometry 31 available w h e n the sample c o n c e n t r a t i o n s o c c u r in a linear part of the calibration c u r v e . Extrapolations are not r e c o m m e n d e d , but they may be necessary if the a m o u n t of sample is limited. M o d e r n instruments contain microprocessor-controlled functions which allow for direct readout of c o n c e n t r a t i o n s . In calibration w o r k , linear regression and curve-fitting p r o g r a m s are carried out automatically.
Analytical Methods for Geochemical Exploration by J. C. Van Loon
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