To determine microplastic chemical content, I recently analyzed some samples. By using the KBr method, Infrared (IR) spectra were obtained using the IRprestige-21 model. I got 19-28 peaks in a band and the metadata was in ASCII file format. The database only contains transmittance values in ##.###### format. For a particular polymer, I need a single-band graph with the required peak. In Origin Pro software, I was unable to do it. Could anyone assist me with this matter? Your assistance will be greatly appreciated. Thanks in advance.
This doesn't make much sense... Most polymers have more than one characteristic peak in the infrared region.
Dear Ezenarro,
Thanks for your rapid response. Actually, I have got the raw graph 📉 and want to simplify this. Please find the reference photos. In the first photo attached, you can see a graph from an IR analysis of my sample, and I am interested in getting a simple graph similar to the second photo. In addition, I have data regarding the analysis. Unfortunately, I cannot complete it.
Dear Srijon Paul
It seems to me that you should optimise the spectra acquistion before starting the data processing. The two images don't seem to correspond to the same method/type of sample. In your spectrum there appear two broad bands that seem to mask the bands of the polymer, if that is a contamination you should purify your sample in order to obtain pure polymers or their mixtures and then measure the spectra to identify them. If you can't do anything about the samples or the method, I suggest you to use a baseline correction algorithm only, as your spectrum seems smooth enough.
You cannot reduce a polymer spectrum to a single band for identification. The first spectrum appears to be an inorganic (possibly a filler) plus water. A band at approx. 1000cm-1 is typical of silicate. A band at approx 1640cm-1 plus the background shape suggests water. Your polymer spectra show the usual hydrocarbon bands plus some inorganic. You cannot make those look like the first one as that will lose vital interpretation information. As the first is in transmission with a fixed pathlength whilst the MIR spectra are reflection with variable pathlength (penetration depth) across the spectrum any attempt at baseline manipulation just distorts the relative band strengths. Spectum E is mainly inorganic filler which is a hydrate. The little bands above 3500cm-1 and the sharp band at about 600m-1 are characteristic. I think it something like talcum powder (Hydrated Magnesium Silicate).
- Badges
- Science topic
- Similar topics
- Physics
- Condensed Matter Physics
- Solid State Physics
- PEAKS