Highly hydrophobic organic chemicals (HOCs), like pyrethroids, strongly adsorb to eroded soil and suspended sediment. This makes concentrations of total suspended solids in ponds a major factor in determining the proportion of chemical in the sediment-sorbed state versus the dissolved (bioavailable) state. The AGRO-2008 model includes a dynamic sediment mass balance, not currently available in other regulatory exposure models, such as EXAMS. The AGRO-2008 model simulates fluctuating levels of suspended sediment in ponds, improving prediction of chemical partitioning, giving AGRO a strong basis for modeling concentrations of HOCs. AGRO-2014 includes the same sediment dynamics as AGRO-2008 with a recalibration appropriate for smaller water bodies based on pyrethroid mesocosm data. Additional enhancements improve the physical realism of model input time periods and increase transparency in reporting of internal processes. The updated AGRO-2014 model offers improvements over EXAMS and AGRO-2008 for predicting aquatic concentrations of HOC compounds in small water bodies receiving erosive runoff.

Development and testing of an updated AGRO model (AGRO-2014) for use in predicting aquatic and benthic pesticide concentrations in ponds

248th National Meeting (2014)

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