Wave number (cm
-1
)
Frequency Assignment
Control
Treated
3478
3445
O-H stretching of H
2
O molecules due to water absorption
1788
1648
N=O stretching
1340-1369
1267-1381
NO
3
asymmetric stretching
835
827
NO
3
symmetric stretching
Table 2:
FT-IR vibrational peaks observed in disodium hydrogen orthophosphate.
