title: Confirmation and identification of the impurities in metolachlor using gas chromatography interfaced with orthogonal acceleration time-of-flight mass spectrometry (GC-oaTOFMS).
abstract: The confirmation and identification of the impurities in metolachlor (a herbicde) by using gas chromatography-orthogonal acceleration time of flight mass spectrometry (GC-oaTOFMS) and gas chromatography-quadrupole mass spectrometry (GC-qMS) are described. For the accurate mass measurement can be carried by GC-oaTOFMS, the elemental compositions of molecular and fragment ions in the spectra are suggested. In the experiment the average of mass deviations between the measured and theoretical values was below 2.5mDa. Finally ten impurities were confirmed and identified. They accounted for 94% of the total impurities by weight.
authors.affiliation: Advanced Analytical Center, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Liaoning, Dalian 116012, PR China; State Key laboratory of Fine Chemicals, Dalian University of Technology, Liaoning, Dalian 116012, PR China.
authors.forename: Yu
authors.initials: Y
authors.lastname: Wanying
authors.forename: Zhang
authors.initials: Z
authors.lastname: Hua
authors.forename: Huang
authors.initials: H
authors.lastname: Weidong
authors.forename: Chen
authors.initials: C
authors.lastname: Jiping
authors.forename: Liang
authors.initials: L
authors.lastname: Xinmiao