| Title: | "Influence of Temperature, Relative Humidity, and Soil Properties on the Soil-Air Partitioning of Semivolatile Pesticides: Laboratory Measurements and Predictive Models" |
| Author(s): | Davie-Martin CL; Hageman KJ; Chin YP; Rouge V; Fujita Y; |
| Address: | "Department of Chemistry, University of Otago , Dunedin 9016, New Zealand. School of Earth Sciences, The Ohio State University , Columbus, Ohio 43210, United States. Department of Mathematics and Statistics, University of Otago , Dunedin 9016, New Zealand" |
| ISSN/ISBN: | 1520-5851 (Electronic) 0013-936X (Linking) |
| Abstract: | "Soil-air partition coefficient (Ksoil-air) values are often employed to investigate the fate of organic contaminants in soils; however, these values have not been measured for many compounds of interest, including semivolatile current-use pesticides. Moreover, predictive equations for estimating Ksoil-air values for pesticides (other than the organochlorine pesticides) have not been robustly developed, due to a lack of measured data. In this work, a solid-phase fugacity meter was used to measure the Ksoil-air values of 22 semivolatile current- and historic-use pesticides and their degradation products. Ksoil-air values were determined for two soils (semiarid and volcanic) under a range of environmentally relevant temperature (10-30 degrees C) and relative humidity (30-100%) conditions, such that 943 Ksoil-air measurements were made. Measured values were used to derive a predictive equation for pesticide Ksoil-air values based on temperature, relative humidity, soil organic carbon content, and pesticide-specific octanol-air partition coefficients. Pesticide volatilization losses from soil, calculated with the newly derived Ksoil-air predictive equation and a previously described pesticide volatilization model, were compared to previous results and showed that the choice of Ksoil-air predictive equation mainly affected the more-volatile pesticides and that the way in which relative humidity was accounted for was the most critical difference" |
| Keywords: | "*Air *Humidity *Laboratories Linear Models *Models, Theoretical Pesticides/*analysis Soil/*chemistry Soil Pollutants/analysis *Temperature Volatilization;" |
| Notes: | "MedlineDavie-Martin, Cleo L Hageman, Kimberly J Chin, Yu-Ping Rouge, Valentin Fujita, Yuki eng Research Support, Non-U.S. Gov't 2015/08/11 Environ Sci Technol. 2015 Sep 1; 49(17):10431-9. doi: 10.1021/acs.est.5b02525. Epub 2015 Aug 21" |
