Abstract
The determination of adsorption and dissipation parameters of pesticides in soils allows for better prediction of their behavior and potential for groundwater contamination. The objective of this study was to compare two methods of estimating the indices for retardation factor and for attenuation factor logtransformed (AFT). The indices were applied to estimate lixiviation risks of the herbicides acetochlor, atrazine and s-metolachlor in the horizons A, B, C and the whole profile for two soils from Buenos Aires province (Argentina). The comparison of the methods consisted in estimating the indices using adsorption and persistence of herbicides obtained from batch experiments (multilayer setting) and from databases (monolayer setting). Herbicide sorption (Koc) and half-life (T1/2) were determined for horizons A, B and C from controlled batch experiments. Estimates of AFT calculated from batch experiments for different recharge rates (0.3, 1.1 and 2.3 mm/day), resulted in very unlikely leaching potentials for the three herbicides in all horizons and soil profiles. However, using tabulated indices it was determined an increased leaching risk, which increased with increasing depth in the following order C> B> A> profile.
| Original language | American English |
|---|---|
| Pages (from-to) | 69-78 |
| Number of pages | 10 |
| Journal | AgriScientia |
| Volume | 30 |
| Issue number | 2 |
| DOIs | |
| State | Published - 2013 |
ASJC Scopus subject areas
- Agronomy and Crop Science
- Soil Science
Keywords
- Attenuation factor
- Groundwater
- Herbicides
- Leaching potential
- Retardation factor