Abstract: Ion-Molecule Association Reactions in Quadrupole Mass Spectrometry Ⅱ. The Quadrupole Mass Spectrometry of Aromatic Aldehyeds, Ketones and Their Related CompoundsXu Jianguang; Huang Met(Analytical and Testing Center, Sichuan University, Chengdu 610064 1 China)Huang Shu(Department of Chemistry Sichuan University, Chengdu 610064, China)Abstract: The behavoirs of unsubstituted and substituted aromatic aldehydes, ketones andbetals, diketones, as well as benzoin and its ethers in quadrupole mass spectrometrywere explored. The results of experiments show that the ion--molecule association reactions taken place in the case of no electroabstracting group on the aromatic ring, andthen the adduct ions LM+ArCOJ+ and M+ArJ+ formed. The carbonyl oxygen servesas donor atoms in this type of association reaction.Keywords: aromatic aldehyde and ketones, related compounds, ion--molecule association reactions, quadrupole mass spectrometry.