Non-Target Screening Of Halogenated Organic Compounds Using Liquid Chromatography-Tandem Mass Spectrometry Precursor Ion Scan

A new analytical method based on liquid chromatography. tandem mass spectrometry (LC-MS/MS) precursor ion scan (PIS) was developed for the non. target screening of halogenated organic compounds (HOCs). Briefly, fragmented halogen ions from the precursor of HOCs could pass Q3 channels fixing at m/z 35, 37, 79, 81 and 127, and the corresponding precursors were simultaneously recorded in Q1. Therefore, the halogenated species and molecular ions of HOCs could be inferred from the selection of Q3 and Q1. Results showed that PIS had a higher sensitivity to HOCs when the collision energy in Q2 was set at 50 eV. Bernoulli experiment models were used to calculate theoretical isotopic abundances of HOCs. This method was successfully applied to the screening of HOCs in laboratory reaction samples and seawater. This work suggested that PIS was potentially an effective tool for the non. target screening of HOCs in various environmental matrices.