Research Article
Analysis of the Dissipation Behavior of Defoliants in Cotton Fiber during Field and Scouring Process Using Liquid and Gas Chromatography
Table 1
Physicochemical properties of the defoliants tribufos, diuron, thidiazuron, and ethephon.
| | Defoliants | Chemical structure | Vapor pressure (mm Hg, 25°C) | Half-life in field soil (days) | Hydrolysis half-life (days) | Toxicitya |
| | Tribufos | | 6.50 × 10−6 | 64.8 | 124 (pH 9) | 192 | | Diuron | | 6.90 × 10−8 | 99.9–134 | 1240–1330 (pH 7) | 500 | | Thidiazuron | | 2.30 × 10−11 | 11.1–16.8 | 337 (pH 7) | 3740 | | Ethephon | | 9.80 × 10−8 | 3.3–9.7 | — | 3122 |
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aExpressed as oral LC50 in rats (mg/Kg).
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