Sample A1

Sample A2

Sample B

Sample C

Abundance %

Abundance %

Abundance %

Abundance %

Alkanolamine solvent

Methyl Diethanol Amine (MDEA)

C₃H₁₂NO₂

90.2

ND¹

72.9

47.2

Pipezine (Pz)

C₄H₁₀N₂

ND¹

58.5

0.2

0.1

Alkanolamine degradation product (by targeted analysis)

N-methylmorpholine (MM)

C₅H₁₁NO

8.9

ND¹

5.3

3.3

N, N, N, N-tetrakis(2-hydroxylethyl) ethylenediamine (TEHEED)

C₁₀H₂₄N₂O₄

ND¹

ND¹

0.3

0.5