all that is possible to see.Non mi definirei un esperto, ma ho analizzato un buon numero di risultati FT-IR.
Sembra che ci sia una discreta quantità di olio base estere che salta fuori, ma cosa stai cercando di scoprire sull'olio con questa scansione?
fantastico!! complimenti!!Ciao!!! Vedo che sei un fan di Mugen ... lo sono anch'io ... infatti ho incontrato il CEO di Mugen Hirotoshi Honda ...
fantastic!! compliments!!Ciao!!! I can see you're a Mugen fan... so am I... in fact I've met the CEO of Mugen Hirotoshi Honda...
The height of the peak would make me assume that oil has at least 2% ester. Less than 2% and greater than 2% (rough estimate) is about where I always saw the difference in peak height from relatively small to relatively large. No real way to tell the type of ester from that scan though.all that is possible to see.
esters is there, it's true. but I think it is impossible to understand the family and the%.
what else can you see
I'm saying that 2% was a common threshold I saw where the spike on the graph might be noticeably different.only 2% ?
In the pharmaceutical industry we use FT-IR for identification purposes to confirm what we bought as raw materials are correctly labeled and the right stuff. We compare the sample and reference spectra to confirm identity. When we first installed an FT-IR in our lab, the company told us that FT-IR was used in forensic analysis for car paint. If a car was hit and run and left some paint behind they could analyze it and based on its spectra and comparison to a state police library, identify the color and make/models of cars that used that color.
Without references, I don't know how you'd perform any semi-quantitative analysis with FT-IR.
Unless an extensive Forensic Analysis is done it is very difficult to determine exactly what constitutes those peaks.I am not an expert on FT-IR by any means but here's my $0.02. In this scan it probably would have been better if the peaks were labelled with their wavenumbers. A modern FT-IR can do this very easily. There is a lot of stuff going in in the 1500-900 CM-1 range where there are a couple of peaks that might help differentiate esters. There may be suggestions of them but they are not well defined. In my experience, if you are looking for qualitative IR, the transmission mode often provides more detail than absorbance. If you are looking to quantify compounds absorbance, with references, is the only way to go. The 1750-1700 CM-1 peak may be the most important in this scan. The fact that it appears to be in the 1730-1715 CM-1 range suggests that it may be a trimellitate or a phthalate ester. Beyond that I don’t think you can differentiate with this scan.
I agree. There is room for a lot of variation in IR interpretation that requires additional analytical methods to clarify.Unless an extensive Forensic Analysis is done it is very difficult to determine exactly what constitutes those peaks.
There are so many DI additive components today that are esters one cannot really say the ester-type peaks is a base oil alone.
For example, ZDDP is an ester, the Boron is an ester, and the dispersant may be an ester as well.