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Moore DR, Thompson RP, Rodney S, Fisher D, Ramanarayanan T, Hall T: Refined Aquatic Risk Assessment for Aldicarb. . Integr Environ Assess Manag. 2009 Aug 4:1.
Aldicarb is a systemic insecticide applied directly to soil and to control mites, nematodes, and aphids on a variety of crops (e.g., cotton, potatoes, peanuts). It is highly soluble in water (6,000 mg/L) and mobile in soils (Koc = 100). As a result, aldicarb has the potential to be transported to aquatic systems close to treated fields. The United States Environmental Protection Agency recently conducted an aquatic screening-level ERA for aldicarb as part of the re-registration review process. We conducted a refined risk assessment for aldicarb to better characterize and understand the risks posed by aldicarb to fish and invertebrates inhabiting ponds and lower-order streams near agricultural areas. For the exposure assessment, Tier 2 PRZM/EXAMS (Predicted Root Zone Model (PRZM) and Exposure Analysis Modeling System (EXAMS)) modeling was conducted to estimate 30-year distributions of peak and 21-day average concentrations of aldicarb and the carbamate metabolites (aldicarb sulfoxide, aldicarb sulfone) in surface waters of a standard pond arising from different uses of aldicarb. The effects assessment was performed using a species sensitivity distribution (SSD) approach. The resulting risk curves as well as available incident reports suggest that risks to freshwater fish, freshwater invertebrates, saltwater fish, and saltwater invertebrates from exposure to aldicarb are negligible. The available monitoring data did not provide conclusive evidence about risks to aquatic biota. |
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