AGRO 83 |
| Each year, the Department of Pesticide Regulation (DPR) calculates a May-October pesticide VOC emission inventory for specified areas and compares emissions on a relative basis to a base year. Fumigants are among the highest VOC contributors. DPR currently assumes 100% of applied fumigants volatilize to the air. However, field monitoring shows fumigant emissions typically less than 100%, varying with application method. DPR has developed application method- and fumigant-specific emission adjustment factors, expressed as proportion of mass applied emitted to the air, for methyl bromide, metam sodium and metam potassium, 1,3-D, chloropicrin, dazomet, and sodium tetrathiocarbonate. Drip application methods for all fumigants show small adjustment factors, between 9 and 15%. The bed/tarp application method for methyl bromide shows the largest adjustment factor at 100%. Other methods with large adjustment factor values include shallow soil injection methods or no tarp methods. |
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Investigating VOCs from Pesticide and Fumigant Applications: State of the Science and New Approaches to Protect Air Quality
1:45 PM-5:10 PM, Monday, August 20, 2007 BCEC -- 259 A/B, Oral
Division of Agrochemicals |