Determination of glufosinate and its metabolite residues in tea by ultra-high performance liquid chromatography-tandem mass spectrometry coupled with precolumn derivatization

=10） ranged from 2.6% to 10.3%. Furthermore， the developed method was used to detect GLU and its metabolite residues in 34 tea samples， and the positive detection ratio was 26.5%. In summary， the proposed method is simple， reliable， practical， and suitable for determining GLU and its metabolite residues in various types of tea.