Detailed Emission Potential Calculations of High Use Pesticide Products Using a Confidential Statement of Formula Based Method
Abstract
This memorandum details the emission potential (EP) calculation of 11 high use pesticide products utilizing the California Department of Pesticide Regulation’s (DPR’s) recently suggested Confidential Statement of Formula (CSF)-based speciation EP method (Oros 2009). Although, the CSF-based method does not replace the more established thermogravimetric analysis (TGA) EP determination, it does provide a quick, easy and efficient alternative method that has been shown to provide TGA comparable EP estimates (Oros and Spurlock 2011). Therefore, CSF-based EP determinations can be used, on a case-by-case basis, until TGA data has been reported by registrants and verified by DPR. Of the 11 pesticide products selected, 6 were found to have an EP value of 0%. Roundup PowerMax®, Glystar Plus®, Mirage®, Rely®, and Ignite 280 SL® EPs were calculated to be 35.28%, 31.27%, 23.80%, 10%, and 7.34%, respectively. For some of the pesticide product formulation ingredients where the specific identity or vapor pressures (VPs) were not available, unless otherwise noted, the ingredients were assumed to contribute to the volatile fraction of the product, and thus, were included in the EP calculation. Therefore, it is noteworthy to point out that some of the calculated EPs might be higher than EP values determined via TGA.