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Soil Analysis of Trifluralin: Methodology and Factors Affecting Quantitation¹

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.

Key Words: Trifluralin • Treflan • Herbicide • G.L.C.-herbicide • U.V.-degradation-trifluralin • Extraction-soil

² Assistant Professor of Soil Chemistry and Professor of Soil Science.

Received for publication April 4, 1970.