Number

Substance

Retention time (min)

1

Acetone

2.18

2

Methanol

2.76

3

Ethanol

3.12

4

Isobutanol

5.23

5

n-butanol

5.88

6

Acetic acid

8.62

7

Propionic acid

9.46

8

Isobutyric acid

9.74

9

Butyric acid

10.37

10

Isovaleric acid

10.80

11

Valeric acid

11.52

12

Crotonic acid

11.94

13

Caproic acid

12.65