The figure shows the FTIR analysis for Plastic bag sample after three months of incubation with a fungal strain under special conditions. As demonstrated all T% at wave lengths in orange labels refer to standard FTIR polyolefins specifically LDPE as stated by Wiley Spectra Base (2020) in http://spectrabase.com/spectrum/IWxs9GBuNp. The other minor dips appearing in the carbonyl and double bond region blue labeled, and those in the finger-print region labeled in green were confusing, so please I need your help. FTIR of control (untreated Plastic bag) in red curve and that of treated in blue curve.
Dear Ahmed,
The treated sample FTIR peak and control sample FTIR seem to be the same and the only differences between them is the amount of transmitance%. In this situation there would be no change in chemical structure of the main sample or if there is, it might be negligible. To be sure about it, it is necessary to make a comparision between the ratio of all FTIR peaks of control and treated samples. For example, the ratio of %T of control sample to the treated sample at 2915, 2848, 1467, 876, and 717 (cm-1) must be calculated. If the difference between all of them is meaningful, so it is acceptable to consider change in chemical structure during treating. Otherwise, it is not possible to consider that its chemical structure was changed.
Ahmed,
There are no differences in the spectra, they do not contain any signs on changes in the compound composition
It would be better to do a baseline correction and normalisation to compare them.
what about crystallinity % and carbonyl index .. is it reliable to follow their calculations based on published articles?
Maximum T% dips in FTIR spectra for control and treated plastic bag samples in the following table
Decrease in T% and shifting in some dips might confirm some changes, your opinion?
I calculated the carbonyl index in Figure 7
and crystallinity % in Figure 8
in the control compared to treatments
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