Concentration of -COOH not found properly by ATR-FT-IR.
But if you want to try, take known amount or concentration of -COOH solutions FT-IR spectra. Then make sure that -COOH band around 3300-3100 is visualized. If heights of the same bands are not changing then measure the area under the peak. If height of bands have changed then Plot the graph of the concentration Vs. Peak height or Peak area. This calibration plot is used for found the concentration of -COOH group in your sample.(R2=0.999)
Now scanned your samples in FT-IR range. Now found the height or peak area of the band (3300-3100) of each sample. Obtained values of peak height or area match with that of calibration plot.
Same experiment also done using proton NMR spectroscopy. NMR spectroscopy gives reliable results. Peak of -COOH's proton is found near 10-12 delta ppm
All compounds having-cooH group gives band between 3350-3150.
Broad band is observed in ftir spectrum
The -OH stretching band of -COOH group normally observed in range of 3300-3100, but sometimes its observed near 3000 Cm-1
sometimes band become more broad difficult to identified.
The C=O stretching band of -COOH group, observed near 1700 Cm-1 .
can we share your explanation through any supportive documents Mehdihasan Shekh
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