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		Tribufos^a (mg/kg)		Diuron (mg/kg)		Thidiazuron (mg/kg)		Ethephon (mg/kg)
		Opened^b	Unopened^c	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.