出版社：Thai Society of Higher Eduction Institutes on Environment
摘要：Due to an increase in the import and use of pesticides, agricultural areas in Thailand need to beevaluated in term of the leaching risk of pesticides in order to prevent groundwater from beingcontaminated with pesticides. In this study, the attenuation factor/ retardation factor model(AF/RF), integrated with GIS software, was used to assess the leaching potential of the appliedpesticides, consisting of atrazine, glyphosate, hexazinone, picloram, ethylene dibromide, andmetalaxyl in Song Phi Nong District, Suphan Buri Province, Thailand. The results indicated thatpicloram had the highest risk of leaching due to the sorption coefficient (Koc) and half-life (t1/2) ofthe pesticide. The remaining pesticides had a lower risk because of their higher sorption by soils.Additionally, soil with a lower organic matter and higher average water flow rate through soil hada higher pesticide leaching risk than other soils. The results also showed that the groundwater inthe study area was safe under the existing conditions, including and the current application rateof pesticides. However, long-term monitoring of pesticide contamination in subsurface soils inthe area is necessary.
