Determination of Pyrethroids in Tea Brew by GC-MS Combined with SPME with Multiwalled Carbon Nanotube Coated Fiber

Table 1

The retention time, monitoring ions, and quantitative ions of 7 pyrethroids.

Peak number	Pesticides	Retention time (min)	Quantitative ions (m/z)	Monitoring ions (m/z)
(1)	Bifenthrin	13.25	181.0	166.0, 182.0, 165.0
(2)	Fenpropathrin	13.45	349.0	141.0, 265.0, 209.0
(3)	Permethrin	15.10	182.0	163.0, 91.0, 165.0
(4)	Cyfluthrin	15.89	163.0	206.1, 226.1, 165.0
(5)	Cypermethrin	16.40	181.0	163.0, 209.0, 91.0
(6)	Fenvalerate	17.6, 18.02	125.0	167.1, 181.0, 225.0
(7)	Deltamethrin	19.07	253.0	251.0, 255.0, 181.0