Characteristic negative mass ions for the pyrethroids reviewed and selected for quantification.

Table 1: Characteristic negative mass ions for the pyrethroids reviewed and selected for quantification.

Compound	Characteristic Ions, m/z	Quantification Ion
Permethrin	171, 173, 207, 209, 211	207
Cyfluthrin	171, 173, 207, 209, 211	207
Cypermethrin	171, 173, 207, 209, 211	207
Deltamethrin	79, 81, 137	79
Fenvalerate	167, 169, 211, 213	167
Mirex, Standard	366, 368, 370, 402, 404, 406	368 or 404
DCBP, Standard	496, 498, 500	498