Get Analytical Atomic Absorption Spectroscopy. Selected Methods PDF

By Jon A. Van Loon

ISBN-10: 0127140506

ISBN-13: 9780127140506

ISBN-10: 0323154867

ISBN-13: 9780323154864

Analytical Atomic Absorption Spectroscopy

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A b o o k b y Fuller (12) d o c u m e n t s m u c h of this w o r k . L / v o v (13) i n t r o d u c e d e l e c t r o t h e r m a l a t o m i z e r s into a t o m i c a b s o r p ­ tion analysis. T h e t e r m " e l e c t r o t h e r m a l a t o m i z e r " will b e u s e d in this b o o k to refer to electrically h e a t e d d e v i c e s s u c h as g r a p h i t e f u r n a c e s a n d r o d s . T h e c o m m o n d e s i g n a t i o n , flameless o r n o n f l a m e a t o m i z e r , will n o t b e e m p l o y e d to a v o i d i m p l i c a t i o n s t h a t o t h e r d e v i c e s s u c h as cold v a p o r a b s o r p t i o n t u b e s are b e i n g d i s c u s s e d in t h i s s e c t i o n .

In a t o m i c a b s o r p t i o n the m o n o c h r o m a t o r is placed after t h e a t o m r e s e r v o i r to help d i m i n i s h light flux o n t h e p h o t o t u b e . T h e p u r p o s e of t h e m o n o c h r o m a t o r is to isolate t h e r e s o n a n c e line a n d to d e c r e a s e t h e emission intensity from the atomizer. Both prisms and gratings have b e e n u s e d in c o m m e r c i a l i n s t r u m e n t s b u t the latter a r e of m u c h g r e a t e r popularity. W h e n gratings are used, two are c o m m o n l y employed, one for t h e ultraviolet a n d t h e o t h e r for the v i s i b l e r e g i o n s of t h e s p e c t r u m .

T h i s is b e c a u s e the a b s o r b a n c e p e r u n i t c o n c e n t r a t i o n h a s fallen to s u c h a small level t h a t the u n c e r t a i n t y g o e s u p v e r y s h a r p l y . C u r v e c o r r e c t i o n is particularly well h a n d l e d w i t h m i c r o p r o c e s s o r - c o n t r o l l e d i n s t r u m e n ­ tation. M o d e r n a t o m i c a b s o r p t i o n e q u i p m e n t p r o v i d e s a w i d e c h o i c e of signal i n t e g r a t i o n t i m e a n d scale e x p a n s i o n interval.

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Analytical Atomic Absorption Spectroscopy. Selected Methods by Jon A. Van Loon


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