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Table 1 Assigned values for different peaks in FT-IR

From: Instrumental characterization of organic wastes for evaluation of vermicompost maturity

Wave number/cm−1

Vibration

Functional group

3300-3500

O–H stretch

Phenols and carboxylic groups

3180-3090

NH2 strech

Primary amides

2925-2850

C–H stretch

Aliphatic methylene groups of lipids and fats

2590-2560

S–H stretch

Thiol group

1740-1720

C=O

Aldehyde, ketone, carboxylic acids and esters

1655-1640

C=O

C=C

Amide I, carboxylates

Aromatic ring modes, alkenes

1570-1550

N–H deformation and C=N stretch

Amides II

1515-1510

Aromatic C=C stretch

Lignin

1421-1410

COO− stretch

C–N stretch

Carboxylic acids

Amide III

1384

N–O stretch

Nitrate band

1320

C–N stretch

Aromatic primary and secondary amines

1000-1100

C–O stretch

Si–O stretch

Polysaccharides

Clay minerals

875

C–O out of plane

Carbonate

850-750

NH2 out of plane

Primary amine group

750-700

N–H wag

Secondary amine group

680-610

S–O bends

Inorganic sulphates

  1. Source: Grube et al. (2006); Smidt and Meissl (2007); Deka et al. (2011); Lv et al. (2013); Ravindran et al. (2013)