水生生物に対する除草剤のリスクの評価

概要

論文の詳細を見る
Types and rates of pesticides applied to paddy fields vary spatially and temporally, and environmental fate and transport of pesticides considerably depend on environmental conditions, in addition to the physical-chemical properties. For ecological risk assessment of 4 herbicides applied to a paddy field in rice-planting season, exposure concentrations to aquatic organisms (PEC) were calculated using 2 mathematical models, which can estimate fate and transport in paddy fields and aquatic environment under the site-specific TEC, and Hazard Quotient defined as PEC/TEC, in which PEC is the 95th percentile value of PEC distribution show that assessed herbicides are at low risk to aquatic organisms.