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Volatilization and Degradation Losses of Aldicarb from Soils¹

ABSTRACT

Aldicarb, 2-methyl-2(methylthio) propionaldehyde O-(methylcarbamoyl) oxime, volatilization from two soils amended with 1 mg toxicant per gram of soil was determined by GLC analysis of trapped pesticide vapors. Volatilization losses were generally depressed by the presence of water and elevated temperatures. Losses ranged from 0.01 to 0.18% of the applied dose during an 18-day period. The highest mortality rates of bioassay organisms subjected to the volatilization vapors were observed at 23C in a soil system being gradually dried by a stream of dry air.

Degradation of aldicarb at 23C exceeded 10% of the applied dose only in the acid Beaumont soil, whereas 24 and 46% of the added material degraded in the moist and dry soil, respectively. At 42C, extensive degradation occurred in both acid and calcareous soil systems; losses ranged from 38 to 82% in the moist samples and 61 to 96% in those allowed to dry to an air-dry state.

Key Words: Temik • UC-21149 • herbicide • pesticides • bioassay

¹ Contribution from the Texas Agric. Exp. Stn.

² Area Agronomist, Texas Agric. Ext. Serv., Lubbock, TX 79409; Assoc. Professor and Professor, Soil and Crop Sci. Dep., Texas A&M Univ., College Station, TX 77843, respectively.

Received for publication December 10, 1976.