Figure 3From: Polar non-hydrocarbon contaminants in reservoir core extractsPartial reconstructed mass chromatogram (summed ions m/z 167 + 181 + 195 + 209 + 217) representing C0–C3-alkylcarbazoles and benzocarbazoles isolated during C18 NEC SPE of diesel. Key: 1, carbazole; 2, 1-methylcarbazole (1-MC); 3, 3-MC; 4, 2-MC; 5, 4-MC; C2-, C2-alkylcarbazoles; C3-, C3-alkylcarbazoles.Back to article page