Soybeans |
158-278 g ai/ha |
Tobacco |
278-420 g ai/ha |
Type |
AI concn |
Suspension concentrate (SC) |
39.6% (w/v) |
Water-dispersible granule (WG) |
75% (w/w) |
Wettable power (WP) |
80% (w/w) |
Mallard duck |
LD50 >2,250 mg/L |
Rainbow trout [96 h] |
LC50 >130 mg/L |
Bluegill sunfish [96 h] |
LC50 93.8 mg/L |
Daphnia[48 h] |
LC50 60.4ppm |
Fate in soil:
Sulfentrazone is very stable to photolysis on soil. It has an aerobic half-life of 1.5 years and an anaerobic half-life of 9 years.
The average value for Koc is 43, with a Kd of less than 1, indicating that sulfentrazone is highly mobile in soil.
Sulfentrazone is degraded by microbial activity; the half-life is 18 months. It is non-volatile.
Fate in aquatic systems:
Sulfentrazone is chemically stable at pH 5 - 9 but readily undergoes direct photolysis in water with a half-life of less than 12 hours.
Sulfentrazone has a high potential to leach into groundwater under certain conditions and move offsite to surface water. Hence, use on soils with a shallow water table or on sand soils with an organic content of less than 1% is not recommended. The product label also makes clear recommendations to avoid run-off to surface waters.
From an analysis of drinking water exposure, carried out using the EPA′s standard environmental fate models, absorbed aggregate exposure estimates and water data from an FMC Corporation ground water study conducted in North Carolina, the calculated drinking water level of concern was estimated to be 298 ppb for all adults. This is greater than the maximum residue of 42 ppb obtained from the Carolina water-monitoring study. Hence exposure to sulfentrazone in drinking water should not pose a risk to human health.
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