Research Article

Photocatalytic Degradation of Trifluralin, Clodinafop-Propargyl, and 1,2-Dichloro-4-Nitrobenzene As Determined by Gas Chromatography Coupled with Mass Spectrometry

Table 2

Probable products formed during the photocatalytic degradation of clodinafop-propargyl (2) along with their retention time and corresponding mass fragmentation.

Retention Time (min)NameConfirmed ByMass fragmentation

24.1Prop-2-ynyl 2-(4-(5-chloro-3-hydroxypyridin-2-yloxy)phenoxy)propanoate (13)MS346.934 (M+)/348.926, 310.977, 281.030, 264.022/266.022, 235.985, 219.987, 207.977, 179.996, 172.055, 146.055, 127.986, 99.903, 90.983, 72.570, 62.376
24.0Allyl 2-(4-(5-chloro-3-fluoropyridin-2-yloxy)-2-hydroxyphenoxy)propanoate (20)MS366.986 (M+)/368.852, 266.016/268.014, 237.979/238.985, 221.978, 209.977, 176.026, 159.034, 129.981, 90.894
23.9Allyl 2-(4-(3-fluoro-5-hydroxypyridin-2-yloxy)phenoxy)propanoate (21)MS333.962 (M+), 226.014/228.012, 198.932, 183.971, 170.949, 154.030, 138.009, 124.974, 110.962, 92.868
22.92-Propynyl (R)-2-[4-(5-chloro-3-fluoro-2-pyridinyloxy)phenoxy]propionate
(clodinafop-propargyl) (2)
NIST348.943 (M+)/350.912/351.911, 310.992, 266.32/268.014, 251.997, 237.995/239.977, 221.978, 209.976, 204.010, 181.988, 176.025, 159.034, 129.980, 109.936, 90.894, 75.672, 62.374
17.62-(4-(5-Chloro-3-fluoropyridin-2-yloxy)phenoxy)acetaldehyde (14)MS281.083 (M+), 237.977/238.996/240.983, 210.984, 176.025/177.028, 149.033, 129.982, 80.755, 62.375
16.24-(5-Chloro-3-fluoropyridin-2-yloxy)phenol (19)MS237.979 (M+)/238.996/240.983, 210.984, 204.010, 176.029/177.028, 156.031, 149.032, 129.980, 108.982, 93.875, 80.755, 75.660, 64.444
13.9Prop-2-ynyl 2-(4-hydroxyphenoxy)propanoate (16)MS220.039 (M+)/221.043, 137.056/138.060, 109.994/111.003, 80.755, 64.444
5.92-Phenoxyacetic acid (18)MS152.038 (M+), 109.994, 80.755
3.85-Chloro-3-fluoropyridin-2-ol (17)MS146.983 (M+)/148.979, 118.976/120.986, 91.831, 56.180

Note that the number in the parenthesis corresponds to the number of the compound in the degradation scheme.