1
March 18, 2005
¾
Exam #2 –
solution key to be posted this weekend
¾
Office Hours Cancelled for today
/
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Instrumentation for AES
Simple! Get rid of source and change the atom cell:
Atomization/
Excitation
Cell
I
Dispersive
Device
Detector
Sample
-atom cell now also needs to create
excited state
atoms (need higher
temperature)
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Atomization/Excitation
Sources for AES
Flames
-
need high temperatures
(4500
o
C possible with O
2
/(CN)
2
flame)
-need a
short pathlength
(eliminates problems with
self-absorption)
-use a
total consumption burner
(noisy, small, inefficient)
-complementary with Flame AAS
(ppm - ppb detn limits)
4
Plasma Sources for
Atomization/Excitation
Plasmas:
hot, ionized gas
Arcs and Sparks
• electrical (directly coupled) ionization
• useful for solid samples
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- Spring '10
- JoelGoldberg
- Atom, Plasma, inductively coupled plasma, ppb detn limits, atomization •Efficient excitation
-
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