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Dislodgeable foliar residues are lognormally distributed for agricultural re-entry studies

Journal of Exposure Science & Environmental Epidemiology volume 15, pages 160–163 (2005)Cite this article

Abstract

The Agricultural Reentry Task Force (ARTF) conducted a study to determine if dislodgeable foliar residues (DFR) are either normally or lognormally distributed. This is important because the data are used with worker exposure data, which generally appear to be lognormally distributed, to calculate transfer coefficients that will be used to assess farm worker re-entry exposure. Two chemicals were used for this study. Carbaryl, a moderately water-soluble chemical, was applied to cabbage at a rate of 2.0 lbs active ingredient/acre (lb ai/A), while methomyl, a highly water soluble chemical, was applied to cabbage at a rate of 0.9 lb ai/A. The residues were dislodged following an ARTF standardized procedure of collecting leaf punches and shaking in a solution of 0.01% Aerosol OT 75. A total of 28 samples were analyzed for each chemical. The mean±SD residue of the carbaryl samples was higher than that for methomyl (511±196 and 170±71 μg per sample, respectively). However, several types of statistical analyses of the data indicated that, for both chemicals, the residues are lognormally distributed.

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Abbreviations

ARTF:

Agricultural Reentry Task Force

DFR:

dislodgeable foliar residue

TC:

transfer coefficient

References

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Acknowledgements

The AFTF is deeply indebted to the many people who have served on both its administrative and technical committees of the ARTF over the last 7 years. Only through the dedication of such individuals, as well as the commitment of the member companies in allowing their employees to dedicate the time and effort required for such a massive, long-term project, could it have been successfully completed. The product of their labors will be a cornerstone of agricultural re-entry risk assessments for decades to come.

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Authors and Affiliations

  1. Uniroyal Chemical Company, Bethany, CT, 06524, USA

    Stefan Korpalski

  2. Walnut Creek, CA, 94596, USA

    Eric Bruce

  3. Sielken & Associates Consulting, Inc., Bryan, TX, 77802, USA

    Larry Holden

  4. Toxicology & Exposure Assessment Services, Inc., Raleigh, NC, 27613, USA

    Dennis Klonne

Authors
  1. Stefan Korpalski
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  2. Eric Bruce
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  3. Larry Holden
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  4. Dennis Klonne
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Additional information

Address all correspondence to: Dr. D. Johnson, Stewart Agricultural Research Services, Inc., 1893 Highway K, Clarence, MO 63437, USA. Tel.: +01-660-762-4240; Fax: +01-660-762-4295; E-mail: davejohn@marktwain.net

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Korpalski, S., Bruce, E., Holden, L. et al. Dislodgeable foliar residues are lognormally distributed for agricultural re-entry studies. J Expo Sci Environ Epidemiol 15, 160–163 (2005). https://doi.org/10.1038/sj.jea.7500383

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  • DOI: https://doi.org/10.1038/sj.jea.7500383

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