Rice Exposure Assessment Models for US, EU and Japan
Waterborne was interested in gaining a better understanding of how model predictions compare to one another, and which model best predicted environmental fate in rice paddies. We used five modeling approaches for estimating environmental concentrations associated with the use of agrochemicals on rice for this study. The comparison of EPA Tier 1, MED-RICE, Japanese regulatory spreadsheet “Ecotox2”, EXAMS-Rice and RICEWQ were made.
The evaluation found that RICEWQ is best suited for higher-tier risk assessment. This was based on its ability to conduct probabilistic assessments and to simulate multiple pesticide applications, metabolites, and the flooding, overflow, and controlled releases of water associated with rice production. These successful model approaches are now being used in the United States, European Union and Japan.