Table 1.

Structure and mass spectra of photolysis by-products of CPF.

Name, RT	Proposed structure	Spectral data (m/z)
Dimethyl ethyl phosphatea (RT = 5.28 min)		153 (M+), 127, 113, 109, 96
O,O-Diethyl phosphateb (RT = 5.45 min)		154 (M+), 127, 109, 95, 79
O,O-Diethyl-methyl thiophosphate (RT = 6.51 min)		184 (M+), 156, 129, 107, 95, 79
O,O-Diethyl thiophosphate (RT = 6.97 min)		170 (M), 141, 113, 95, 81
2-Hydroxyl-3,5,6-trichloro pyridine (RT = 10.21 min)		197 (M+), 169, 134, 107
3,5,6-Trichloro-2-pyridinyl acetic acida (RT = 10.27 min)		226 (M+), 210, 182, 146, 110
3,6-Dichloro-2-[pyridinyl-O,O-ethyl] thiophosphate (RT = 15.14 min)		315 (M+), 280, 252, 224, 163, 97
CPF (RT = 17.7 min)		349 (M+), 314, 286, 258, 197, 125, 97
CPF oxon (RT = 20.88 min)		333 (M+), 310, 254, 203, 193

RT, retention time

^aFound in methanol solution only.

^bFound in water solution only.