Hi, everyone, I’m utilizing the FTIR to analysis microplastics. However, I cannot find the C-C bond peak or C-H bond peak in the result(black one). The result was shown in the below. As you can see, only two peaks were detected which are –OH stretching and C=C stretching. Hence, I wonder that if the aqueous will affect the FT-IR result.
On the other hand, some bonds have the same absorption wavenumber such as OH stretching (3550-3200 cm-1) and NH stretching(3400-3300cm-1). As for that, when the OH bond and NH bond exist at the same time, will the OH bond peak cover the NH bond peak.
Thank you so much.
I can't see anything else but water in your spectrum. The band you think is the C=C stretching vibration is nothing else but the deformation vibration of water. See e.g. Article ChemInform Abstract: Light at the Interface: The Potential o...
Thomas Mayerhöfer
Thank you very much for your answer. I have found a way to dry the microplastics to remove the water effect. But I still have a problem. As we can see the data that is attached. Sample had lower absorbance (pink one, fig1) than the data from the database (black one, fig2). On the other hand, I wonder that the absorbance is always greater than 0 even if there is no peak.
Sandeep B. Somvanshi
Thank you very much for the answer. You said that as for fingerprint frequencies, these are highly characteristic of the molecule as a whole; they tell what is going on within the molecule. I am sorry that I just don’t know the exact meaning of that. Could you please explain that to me?
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