Premium
Movement of Methazole and Its Degradation Products in Soils
Author(s) -
Swoboda Allen R.,
Merkle Morris G.
Publication year - 1977
Publication title -
journal of environmental quality
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.888
H-Index - 171
eISSN - 1537-2537
pISSN - 0047-2425
DOI - 10.2134/jeq1977.00472425000600040011x
Subject(s) - loam , soil water , distilled water , chemistry , leachate , leaching (pedology) , environmental chemistry , environmental science , soil science , chromatography
The movement of 2‐(3,4‐dichlorophenyl)‐4‐methyl,1,2,4‐oxadiazolidine‐3,5‐dione (methazole) tagged with 14 C was studied in Lakeland sand, Nacogdoches sandy loam, Norwood clay loam, and Miller clay soils. The herbicide, at a rate equivalent to 3.4 kg/ha, was incubated for 30 days with each soil. The treated soil, equivalent to 2.5 cm in a 15‐cm diameter column, was placed on the surface of untreated soil contained in columns. The columns were subsequently leached daily with 1.25 cm of distilled water for 42 days. Very little 14 C‐activity was detected in the leachate. The percentage of 14 C‐tagged material added which leached through the soils was 2.75, 0.84, 2.87, and 1.01 for the Lakeland, Nacogdoches, Norwood, and Miller soils, respectively. Upon sectioning the columns, the majority of 14 C‐active material was found in the 0‐ to 2.5‐ and 2.5‐ to 7.5‐cm sections, although a considerable amount of material was found in the 7.5‐ to 15‐cm sections of the Lakeland and Norwood soil columns. Very little herbicide was found below 15 cm in any of the soil columns. Essentially all of the 14 C‐active material present in the soils could be extracted by either shaking for 2 hours with methanol or refluxing with methanol for 16 hours in a soxhlet extractor. Wet combustion of soil samples indicated that very little 14 C‐activity remained in the samples extracted by the soxhlet method. Methazole was readily converted to 1‐(3,4‐dichlorophenyl)‐3‐methylurea (DCPMU) and 1‐(3,4‐dichlorophenyl) urea (DCPU) in the soils studied, with DCPMU being present in the largest quantities. Very little unaltered methazole or unidentified degradation products were detected in the soils.