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Soil Analysis of Trifluralin: Methodology and Factors Affecting Quantitation 1
Author(s) -
Harrison R. M.,
Anderson O. E.
Publication year - 1970
Publication title -
agronomy journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.752
H-Index - 131
eISSN - 1435-0645
pISSN - 0002-1962
DOI - 10.2134/agronj1970.00021962006200060029x
Subject(s) - trifluralin , chemistry , gas chromatography , extraction (chemistry) , soil water , electron capture detector , environmental chemistry , chromatography , agronomy , environmental science , pesticide , soil science , biology
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.