Although Bentazone does not have soil activity, it has low to moderate persistence with a soil dissipation half-life, DT50, of 7-33 days.5 The dissipation time, DT50 for foliar residues is 5.5 days.6 Bentazone does not adsorb strongly to soil, Koc = 3-176 mL/goc.5 It has a medium to high potential to leach to groundwater or move offsite to surface water. Monitoring studies have demonstrated that bentazon can leach to groundwater in certain vulnerable environments. Bentazone can also runoff fields dissolved in surface water.

Detection in Minnesota Waters

The MDA monitors groundwater and surface water for Bentazone through its Agricultural Chemical Monitoring and Assessment Program. In 2020, bentazon was detected in 15% of the 223 groundwater samples analyzed. It was detected more frequently than its major degradate, Bentazone AIBA. The maximum concentration detected was 2,780 ng/L, which is approximately 10% of the Minnesota Department of Health’s human health-based reference value of 30,000 ng/L. Bentazone was detected in 28% of the 386 surface water samples analyzed by MDA in 2020, with a maximum concentration of 834 ng/L.6 The lowest EPA Office of Pesticide Programs (OPP) aquatic life benchmark for bentazon is 4,500,000 ng/L (for non-vascular plants).9 The degradate, bentazon AIBA, was not detected in surface water samples.

Water Quality Portal data for the Upper Midwest indicated that 9% of groundwater sample between 1993 and 2020 had detections of bentazon10. Minnesota groundwater samples had 17% detection frequency for bentazon, including the maximum detection of 24,500 ng/L. This detection was 82% of the Minnesota Department of Health reference value (30,000 ng/L). Bentazon was detected in 17% of Minnesota surface water samples with a maximum concentration of 4,690 ng/L which is 0.1% non-vascular plant benchmark.

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DiazinonBentazone is used as herbicide in wheat field
Although Bentazone does not have soil activity, it has low to moderate persistence with a soil dissipation half-life, DT50, of 7-33 days.5 The dissipation time, DT50 for foliar residues is 5.5 days.6 Bentazone does not adsorb strongly to soil, Koc = 3-176 mL/goc.5 It has a medium to high potential...