Wavelength
functional group
plant
3300~3500
N-H in amines and amides
Vetiver Sunflower
3400~3200
-OH stretch from –COOH and –COH
1600~1650
Aromatic –C=C vibration, -C=O stretch from H-binded conjugated ketones, and –COO- asymmetric stretch1,2
1000~1200
C-O stretch of polysaccharides
1080
Si-O bending
The soil
