Bentazon
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IUPAC name
3-Isopropyl-1H-2,1,3-benzothiadiazin-4(3H)-one 2,2-dioxide
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3D model (Jmol)
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| ECHA InfoCard | 100.042.335 |
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PubChem CID
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| Properties | |
| C10H12N2O3S | |
| Molar mass | 240.28 g·mol−1 |
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Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
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Bentazon (Bentazone, Basagran, Herbatox, Leader, Laddock) is a chemical manufactured by BASF Chemicals for use in herbicides. It is categorized under the thiadiazine group of chemicals. Sodium bentazon is available commercially and appears slightly brown in colour.
Bentazon is a selective herbicide as it only damages plants unable to metabolize the chemical. It is considered safe for use on alfalfa, beans (with the exception of garbanzo beans ), corn, peanuts, peas (with the exception of blackeyed peas ), pepper, peppermint, rice, sorghum, soybeans and spearmint; as well as lawns and turf. Bentazon is usually applied aerially or through contact spraying on food crops to control the spread of weeds occurring amongst food crops. Herbicides containing bentazon should be kept away from high heat as it will release toxic sulfur and nitrogen fumes.
Bentazon is currently registered for use in the United States in accordance with requirements set forth by the United States Environmental Protection Agency. However as of September 2010, the herbicides Basagran M60, Basagran DF, Basagran AG, Prompt 5L and Laddock 5L are currently under review for pending requests for voluntary registration cancellation.
In general, bentazon is quickly metabolized and degraded by both plants and animals. However, soil leaching and runoff is a major concern in terms of water contamination. In 1995 the Environmental Protection Agency (EPA) stated that levels of bentazon in both ground water and surface water "exceed levels of concern". Despite the establishment of a 20 parts per billion Health Advisory Level there is no requirement to measure for bentazon in water supplies as the Safe Drinking Water Act does not regulate bentazon. The United States EPA found bentazon in 64 out of 200 wells in California - the highest number of detections in their 1995 study. This prompted the State of California to review existing toxicology studies and establish a "Public Health Goal" that limits bentazon in drinking water to 200 parts per billion.
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