Fig. 2: Chromatograms of benzene polycarboxylic acids (BPCAs) molecular markers for polycyclic aromatics in Chang’E 5 lunar soil samples measured by liquid chromatography-triple quadrupole mass spectrometry (LC-MS/MS). | Nature Communications

Fig. 2: Chromatograms of benzene polycarboxylic acids (BPCAs) molecular markers for polycyclic aromatics in Chang’E 5 lunar soil samples measured by liquid chromatography-triple quadrupole mass spectrometry (LC-MS/MS).

From: Polycyclic aromatics in the Chang’E 5 lunar soils

Fig. 2: Chromatograms of benzene polycarboxylic acids (BPCAs) molecular markers for polycyclic aromatics in Chang’E 5 lunar soil samples measured by liquid chromatography-triple quadrupole mass spectrometry (LC-MS/MS).

The LC-MS/MS ion source utilized electrospray ionization (ESI) operated in negative mode. The BPCAs were separated on a reversed-phase LC column (InfinityLab Poroshell 120 SB-C18, 4.6 × 100 mm, 2.7 μm, Agilent) using a binary gradient elution system, with 4% formic acid as mobile phase A and acetonitrile as mobile phase B. The identified BPCAs included mellitic acid (B6CA) and benzenepentacarboxylic acid (B5CA) (A), pyromellitic acid (1,2,4,5-B4CA) and its two isomers (B), trimellitic and hemimellitic acids (1,2,4-B3CA and 1,2,3-B3CA) (C) and 3-nitrophthalic and 5-nitro-1,2,3-benzenetricarboxylic acids (3-NO2-1,2-B2CA and 5-NO2-1,2,3-B3CA) (D).

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