enrico88
Harmless
Posts: 2
Registered: 25-8-2011
Member Is Offline
Mood: No Mood
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FTIR SPECTRUM
CAN YOU HELP ME INTERPRETATING THIS SPECTRUM??... RESIDUES OF KEROSNEE UNBURNED
Attachment: picchi kerosene giugno2.pdf (3kB)
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Attachment: kerosene giugno2.pdf (21kB)
This file has been downloaded 486 times
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Magpie
lab constructor
Posts: 5939
Registered: 1-11-2003
Location: USA
Member Is Offline
Mood: Chemistry: the subtle science.
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enrico please do not double and triple post. It is against forum policy and is very irritating. It is especially irritating to those who may be most
capable of helping you. I suggest you delete the first two posts, assuming that they are indeed duplicates of the last post.
The single most important condition for a successful synthesis is good mixing - Nicodem
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DDTea
National Hazard
Posts: 940
Registered: 25-2-2003
Location: Freedomland
Member Is Offline
Mood: Degenerate
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You don't have to explain every wiggle in the spectrum. Focus on the prominent peaks:
3820,30 ; ~3740; ~3275; ~3090; 2838,29; 2341,40; 1557,38; and 1109 cm^-1
Also, it looks like you've got some significant atmospheric contamination in this spectrum. That prominent peaks around 2341,40 cm^-1 are probably
due to CO2. CO2 also has prominent absorptions above 3600 cm^-1. If there's CO2 in your spectrum, there's probably water vapor there too--and in
fact, you can see some water vapor absorptions above 3600 cm^-1.
Spectrum of CO2: http://webbook.nist.gov/cgi/cbook.cgi?Spec=C124389&Index...
Take home message: ignore everything above 3600 cm^-1.
How did you collect this spectrum? Was it on a diamond ATR crystal, perchance? If I recall correctly, diamond has a strong absorption around 2800
cm^-1...
Pretty much, it looks like you forgot to run a background spectrum 
[Edited on 8-25-11 by DDTea]
"In the end the proud scientist or philosopher who cannot be bothered to make his thought accessible has no choice but to retire to the heights in
which dwell the Great Misunderstood and the Great Ignored, there to rail in Olympic superiority at the folly of mankind." - Reginald Kapp.
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