Analysis of the Dissipation Behavior of Defoliants in Cotton Fiber during Field and Scouring Process Using Liquid and Gas Chromatography
Table 3
Defoliant residues in cotton fiber after different time intervals from their application on the cotton field.
Time from application
Tribufosa (mg/kg)
Diuron (mg/kg)
Thidiazuron (mg/kg)
Ethephon (mg/kg)
Openedb
Unopenedc
Opened
Unopened
Opened
Unopened
Opened
Unopened
1 hour
12.4 ± 1.1
ND
10.2 ± 0.8
ND
5.3 ± 0.4
ND
19.5 ± 1.3
ND
7 days
7.6 ± 0.5
2.5 ± 0.2
5.3 ± 0.7
1.5 ± 0.2
2.5 ± 0.2
0.9 ± 0.1
11.8 ± 1.0
2.2 ± 0.3
14 days
4.8 ± 0.3
1.5 ± 0.2
3.3 ± 0.3
1.0 ± 0.2
1.3 ± 0.1
0.5 ± 0.1
6.7 ± 0.9
1.3 ± 0.2
21 days
3.4 ± 0.3
1.0 ± 0.1
2.2 ± 0.3
0.8 ± 0.1
0.7 ± 0.1
0.3 ± 0.0
4.5 ± 0.6
0.8 ± 0.1
28 days
1.9 ± 0.2
0.5 ± 0.1
1.3 ± 0.2
0.4 ± 0.1
0.5 ± 0.1
0.1 ± 0.0
3.3 ± 0.5
0.5 ± 0.1
aResults are expressed as the mean ± standard deviation of three replicate samples. bFiber from cotton bolls opened prior to pesticide application. cFiber from cotton bolls opened posterior to pesticide application. ND: not detected.