Submitted to: Agronomy Abstracts
Publication Type: Abstract Only
Publication Acceptance Date: 10/29/1992
Publication Date: N/A
Citation: N/A Interpretive Summary:
Technical Abstract: Three radiolabeled pesticides, representing a wide range of volatility, were applied to abiotic (gamma-irradiated) soil to study the mechanisms of pesticide aging in soil. The pesticides, listed in increasing order of volatility included atrazine, clomazone, and 1,2-dichloroethane (DCE). Soils were incubated under 100 kPa water pressure at 25 C. Soil subsamples were extracted with 0.01 M CaCl2 as well as acetone before and after pulverization with a disc mill. Soil grinding increased by a factor of 3-5 the quantity of DCE released with the aqueous extractant. Grinding also significantly increased the release of aged clomazone with the aqueous extractant, though the extent of the increase was much less, and had little effect on release of aged atrazine. These results indicate the lability of aged material to grinding increases with increasing pesticide volatility, supporting a role of volatility in the intraparticle diffusion process.