Soil Analysis of Trifluralin: Methodology and Factors Affecting Quantitation1
- R. M. Harrison and
- O. E. Anderson2
A simplified soil extraction procedure was evaluated for the recovery of trifluralin (a,a,a,-trifluoro-2,6-dinitro-N,N-dipropyl-p-toluidine). Soil recovery values for the herbicide compared favorably with those reported in the literature. Recoveries of 90 to 93% of soil-incorporated trifluralin were obtained over a 7-day period, regardless of soil moisture conditions, ranging from 0 to 200% of field capacity, and whether treated soils were exposed to the atmosphere or maintained under airtight conditions. After 14 days, herbicide recovery for all treatments was approximately 64%.
Trifluralin in methanol or N-hexane solution was rapidly degraded by ultraviolet light. In a 24-hour U.V. exposure study, seven degradation products were observed using gas-liquid chromatography (GLC). Under laboratory conditions trifluralin solutions were maintained in the dark for 30 days without degradation but exhibited a 1.4% loss per day when maintained under laboratory light conditions.
Linear electron capture detector response was shown to be related to injection volume of trifluralin solutions when analyzed quantitatively.Please view the pdf by using the Full Text (PDF) link under 'View' to the left.
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