Name Structure Retention time, min Molecular formula [M+H]+theoret. [M+H]+experim. Error, ppm Fragment ions m/z (relative intensity)
Diazepam (DIZ) 8.6 C16H13ClN2O 285.0789 285.0791 -0.7 285 (100), 154 (25), 257 (19), 193 (17), 222 (17), 228 (15), 182 (5)
DEGRADATION PRODUCTS 1 4.5 C16H15ClN2O2 303.0895 303.0880 4.9 167 (100), 239 (72), 285 (40), 303 (36)
2 10.3 C14H12ClNO 246.0680 246.0690 -4.1 246 (100), 195 (50), 228 (42), 177 (40), 149 (37)
3 4.2 C15H13ClN2O 273.0789 273.0777 4.4 158 (100), 273 (80), 196 (13), 228 (12)
4 7.6 C15H13ClN2O2 289.0738 289.0736 0.7 289 (100), 156 (27), 260 (19), 223 (17), 230 (17), 193 (15)
5 8.9 C13H10ClNO 232.0524 232.0533 -3.9 232 (100), 129(48), 158 (44), 117 (40) 214 (36), 191 (32), 154 (28), 141 (28)
6 6.9 C15H11ClN2O 271.0632 271.0645 -4.8 271 (100), 140 (88), 165 (56), 208 (50), 243 (18), 193 (13), 226 (9)
7 7.6 C15H11ClN2O 271.0632 271.0638 -2.2
8 8.1 C14H10ClNO 244.0524 244.0535 -4.5 153 (100), 209 (90), 177 (52)
9 7.4 C14H9ClN2O 257.0476 257.0488 -4.7 207 (100), 124 (530, 223 (20)
Table 2: Degradation products of DIZ identified during the irradiation of river water samples by Xe-lamp light.