Determination of extractable and nonextractable radioactivity from small field plots 45 and 95 weeks after treatment with (/sup 14/C)dicamba, (2,4-dichloro(/sup 14/C)phenoxy)acetic acid, (/sup 14/C)triallate, and (/sup 14/C)trifluralin

Journal Article · · J. Agric. Food Chem.; (United States)

OSTI ID:5931967

Smith, A E; Muir, D C.G.

The degradation of ring-labeled (/sup 14/C)dicamba (2-methoxy-3,6-dichlorobenzoic acid), ring-labeled (/sup 14/C)-2,4-D ((2,4-dichlorophenoxy)acetic acid), (2-/sup 14/C)triallate (S-(2,3,3-trichloroallyl) diisopropylthiocarbamate), and ring-labeled (/sup 14/C)trifluralin (..cap alpha..,..cap alpha..,..cap alpha..-trifluoro-2,6-dinitro-N,N-dipropyl-p-toluidine) was studied under field conditions at rates of 1 kg/ha in small sandy loam plots. Duplicate plots were sampled to a depth of 10 cm after 45 and 95 weeks and extracted with aqueous acetonitrile to determine amounts of extractable radioactivity. The extracted soils were then oxidatively combusted to determine nonextractable, or bound, radioactivity. After 45 weeks, soluble radioactivity recovered from the dicamba-, 2,4-D-, triallate-, and trifluralin-treated plots was <1, 2, 50, and 77% of that applied, while the nonextractable activity accounted for 2, 10, 15, and 10% of that applied. After 95 weeks, <1, 1, 16, and 38% of the applied radioactivity were, on the average, extractable from the dicamba-, 2,4-D-, triallate-, and trifluralin-treated plots, while 3, 6, 30, and 22%, respectively, remained in a solvent nonextractable form. 31 references, 4 tables.

• Research Organization: Agriculture Canada Research Station, Regina, Saskatchewan
• OSTI ID: 5931967
• Journal Information: J. Agric. Food Chem.; (United States), Journal Name: J. Agric. Food Chem.; (United States) Vol. 32:3; ISSN JAFCA
• Country of Publication: United States
• Language: English

Related Subjects

553001* -- Agriculture &amp; Food Technology-- Tracer Techniques-- (-1987)
60 APPLIED LIFE SCIENCES
BUILDUP
CARBON 14 COMPOUNDS
CHEMICAL REACTIONS
DECOMPOSITION
FIELD TESTS
HERBICIDES
ISOTOPE APPLICATIONS
LABELLED COMPOUNDS
PESTICIDES
RADIOACTIVITY
SAMPLING
SOILS
TESTING
TRACER TECHNIQUES