Jon A. Van Loon's Analytical Atomic Absorption Spectroscopy. Selected Methods PDF
By Jon A. Van Loon
Analytical Atomic Absorption Spectroscopy
summary: Analytical Atomic Absorption Spectroscopy
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Additional resources for Analytical Atomic Absorption Spectroscopy. Selected Methods
T h e g r e a t e r t h e line d e n s i t y o n a g r a t i n g , t h e h i g h e r t h e angle of d i s p e r s i o n . E In c o n t r a s t to a p r i s m , the g r a t i n g d i s p e r s e s light in a l i n e a r f a s h i o n o v e r the w a v e l e n g t h r a n g e . U n f o r t u n a t e l y , g r a t i n g s p r o d u c e s e c o n d a n d t h i r d - o r d e r lines of a g i v e n w a v e l e n g t h . T h e s e b e c o m e t r o u b l e s o m e for t h e analysis of e l e m e n t s in t h e h i g h - w a v e l e n g t h r a n g e .
Wavelength Fig. 23. Schematic representation of nonspecific background absorption. 46 1 GENERAL PRINCIPLES Table V Nonabsorbing Lines Element V Cr Cd Pb Ni Zn Cu Mn Ag a Analytical line (Ä) Background line (Ä) 3184 3579 2288 2833 2320 2139 3247 2795 3281 3196 (366x)° 2264 2820 2316 (212x)« 2961 2817 3324 Approximate value (accurate value not known). To c o r r e c t for b a c k g r o u n d u s i n g t h e n o n a b s o r b i n g - l i n e m e t h o d , t h e i n s t r u m e n t c h a r a c t e r i s t i c s m u s t b e c o n s i d e r e d .
T h e m e t h o d of s t a n d a r d a d d i t i o n s is useful for o v e r c o m i n g c h e m i c a l interference particularly in e l e c t r o t h e r m a l w o r k . T h i s t e c h n i q u e is, h o w e v e r , t i m e c o n s u m i n g c o m p a r e d to t h e a b o v e a p p r o a c h . Ionization Interferences A t o m s of e l e m e n t s p o s s e s s i n g v e r y l o w i o n i z a t i o n p o t e n t i a l s c a n b e c o m e i o n i z e d at flame a n d f u r n a c e t e m p e r a t u r e s .
Analytical Atomic Absorption Spectroscopy. Selected Methods by Jon A. Van Loon