The volatilization, degradation, adsorption, and desorption characteristics of aldicarb [2-methyl-2-(methylthio) propionaldehyde 0-(methylcarbamoyl) oxime] in soils and clays

Abstract

Pesticide volatilization from solid and solution aldicarb and from Houston Black (calcareous) and Beaumont (acid) solid amended with 1 mg toxicant per g soil was determined by GLC analysis of trapped pesticide vapors. The apparatus used maintained sample temperatures at 23° or 42°C and was designed for simultaneous use as a bioassay technique and as a means of recovering aldicarb vapors emitting from the sample. Volatilization losses of aldicarb were generally depressed by the presence of water (solution aldicarb) and elevated temperatures. The highest mortality rates among the bioassay organisms were observed in the 23°C soil systems which were being gradually dried by a stream of dry air. For all systems, aldicarb volatilization losses ranged from 0.01 to 0.18% of the applied dose. ...